Woody plants collectively. "Book of Rites Order": "﹝ ﹞ trees on summer months Fang Sheng, Nai Ming Yu people, into the mountain line of wood, not a cut logging." Sanguo Wei Cao Cao, "the bitter cold line": "What trees bleak, North wind is sad . "," Water Margin "third two back:" Song Jiang looked at students in front of the high mountain was strange, dense trees, the hearts of joy. "Yang Shuo" Kapok ":" The night was black, although the trees on both sides of every railway some distance they hung a lamp, this does not give passengers much help. "
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Tree Planting
Tree planting. "Right to repair pipe": "Ten years is planting trees." Han Wang Bao "fourth son about Germany": the "who worry about their Du trees, protect the people who in addition to their thief."
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No. 6
Tree is a woody trunk and branches of plants, can survive for many years. Generally referred to as tree tree, with a clear trunk upright, plants generally tall, branching from the ground higher, the formation of the crown. There are a variety of trees. Saying there will be larger in the shrub known as the "tree", such as pomegranate, tea and so on.
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Tree structure
The main four parts of the tree is the roots, trunk, branches, leaves. Roots in the ground, in the bottom of a tree, many roots. Divided into five parts in the trunk. The first layer is the bark. The surface of the trunk bark is to protect the tree itself, and to prevent disease invasion. Here in the bark phloem. This layer of fibrous tissue to transport sugar from the leaves down. The third layer is the cambium. This layer is very thin, is the growth part of the trunk, since all the other cell layers are from. The fourth layer is the sapwood. This layer is to transport water from the roots to the tree throughout the body, this layer is usually lighter than the heartwood. Fifth layer is the heartwood. Old heartwood is the sapwood, both collectively known as xylem. Trunk mostly heartwood.
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The role of trees
Trees can adjust the climate, clean air, wind noise reduction, is man's best friend. Trees are oxygen factories. l ha broad-leaved forest one day can absorb 1 ton of carbon dioxide and release 0.73 tons of oxygen. Trees are dust filters. When the dust volume of air through the woods, with the wind speed decreased, the larger dust particles in the air would drop rapidly. In addition, some trees or epidermal hairs that secrete oil, they can dust clung to her body, so that the airflow through the woods dust is greatly reduced. Trees are bactericidal experts. Many trees in the growth process will secrete to kill Yan Su, killed by the dust and the various pathogens. According to the survey, each cubic meter of air in the bacterial content, department stores and 400 million, the avenue of 58 million, the park is 100, while the forest is only 55. Forest and department store difference between the bacterial content of the air 70,000 times. In addition, trees or natural water reservoirs and natural air conditioning.
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Kingdom of exotic trees and human relations
In between heaven and earth, between the human and the stars, there is a strange tree kingdom. Trees in the kingdom on earth, there are tens of thousands of kinds of trees. The height of its trees is: There are more than Germany Folai Fort Cathedral (115 meters) of the giant fir (122 m), there are also higher than the pyramids of Egypt (137 m) of the Australian eucalyptus (146 meters); also have height only 5 to 10 cm in the supine evergreen rhododendrons. To height growth for each year: some trees, kapok trees grow in the appropriate place up to 2 meters per year; bamboo shoots are underground stems (rhizome) on the long shoots, usually in the spring grow above ground. Some bamboo can grow overnight 2 to 3-meter-high bamboo stalks, "mushroom" is the vivid portrayal. To the diameter of the trunk is: tropical African baobab tree trunk diameter of up to 12 meters above the giant sequoias than 2 meters in diameter need more. Redwood known as "Sequoia", originating in the United States, fast growth, long life. Giant fir up to 100 meters high, trunk diameter of up to 10 meters; only reached 60 cm thick bark, a tree of total weight of 6,000 tons. Allegedly, there was a road across from the giant cedar dry central, car shuttle, very spectacular. However, some trees, no thickening in a lifetime. Such as bamboo, grow bamboo stalk diameter is the maximum diameter bamboo shoots, will not be enlarged. The world's longest tree age, when the number of the ginkgo tree native to China. Monastery in Ju County, Shandong Province given the ginkgo tree, said to have been growing up to 3700 years. Guizhou Province, the ancient ginkgo tree Fuquan with trees, the expert research, over 4440 years old, age of the long, called the world. Old trees there are more than a thousand round cypress, arborvitae trees, yew trees, camphor, mulberry trees, Dracaena, red cedar, cedar trees of Lebanon. Leaf trees is even more strange, nothing is there. The size of its leaves for a leaf to several meters 1 meter long are cycads, palm, Livistona, coconut, oil palm, etc., but the Brazilian palm leaves up to 20 meters; also has a small leaf is only a few millimeters such as P. orientalis, Tamarix, Casuarina and other species of leaf-shaped scales. Full of flowering trees, the season's four seasons a year in spring, summer, autumn and winter. Color of trees, flowers, really colorful, colorful; flower size, length of flowering, it is colorful. Large fruit trees such as basketball coconut, grapefruit and durian, etc., and even up to 60 cm above, 40 cm wide and weighs more than 20 kilograms of wood pineapple (pineapple), and some are as small as a grain of rice; its size are different different forms, is really varied and diverse. Some fruit trees is a human food, cuisine; and some fruit trees can make a kill with poison. The propagation of trees, in addition we know cutting, layering and dividing, grafting and other vegetative propagation and seed multiplication, there are phenomena of the trees are viviparous. For example: the growth of mangrove on the beach in the tropics, not from the mother in the fruit before the seeds inside the fruit began to sprout and grow roots, such as rod-like, out of the fruit outside. Once, after the fruit from the mother, by its own weight into the soil, can grow for several hours after the lateral root to form new individual plants. It is worth mentioning that there is a kingdom in the trees and the trees: banyan tree. Long in the trunk of the tree there are many aerial roots, the aerial roots grow down deep soil, so year after year, the formation of a forest can be a banyan tree. "One tree forest," which means the spectacle of the banyan tree. There are some trees prospecting functions, such as there is a open under normal conditions the wild roses red flowers, in the absorption of a large number of copper ions out of the blue flowers; it brought geologists have found a copper mine in the Urals. In ancient times people have the disease through treatment of the legend of trees. Russia is now circulating in a tree therapy. Russian scientists through a test reveals wooden circle (cross section of the trunk, dug a hole in the middle) in the treatment of diseases wonderful performance, and thus invented the "bio-corrector" (similar to the wooden circle) for the rehabilitation business. Trees made with different biological correction can cure people of different diseases. For example, birch treat atherosclerosis, hepatitis, gastritis, gastric ulcer, prostatitis, etc.; Populus treat influenza and pneumonia. Early humans believed that the strange trees in the kingdom of trees is a strange object over nature. Trees in the fall gradually "die", standing solemn winter and spring, and recovery of regeneration. All this makes people feel the trees is so mysterious and inscrutable, as the Almighty God and God as the Holy Spirit. In the West, people in ancient times to the simple emotions to understand the Kingdom of trees, that: the roots of trees can be as deep as hell, green canopy stretching from heaven, the trees, only trees to the heaven, earth and hell closely linked; Only through the trees, to achieve long-cherished wish to heaven. In ancient China had a similar legend. In many legends agree that human life is due to the growth of the seeds of trees generated. So now people are planting trees in the cemetery to show life does not end by death. The fate of the trees into the tree, the tree of life. Because the trees are "a symbol of life, it represents the life-giving universe, the universe has a new life because of it." Christmas in the West, due to the Christmas tree and look colorful and lively. Christmas trees as a representative of the world, a symbol of inexhaustible source of life. Indeed, if not the Kingdom of the trees, no green plants, the world would be unthinkable. According to the modern scientific point of view, what gave rise to the Kingdom of the trees, what? Trees by the Kingdom to improve the survival of mankind depends on environmental quality. Kingdom and the green trees continue to carry out photosynthesis, consume carbon dioxide, manufacturing fresh oxygen; air more than 60% of oxygen from the trees and green plants on land, so people are likened to trees and green plants "oxygen factory" "factory fresh air." There are many trees and trees to the Kingdom of the secretion of spinosad to kill all bacteria in the air; and also able to absorb the emissions of industrial production of toxic gases, atmospheric pollution, smoke dust retention and elimination of noise pollution harmful to human beings and so on. People in the shade in summer and in direct sunlight feel is a big difference. Summer people will feel cool in the shade. This is due to the dense canopy of green trees can be masking the sun, absorb the sun's radiant heat, thereby reducing the temperature within the small environment. Trees as a single, large, pump, and it keeps the moisture in the soil absorbed into the tree body, and through the leaf transpiration of water absorbed by the root of most of the water vapor into the atmosphere in the form of inter-diffusion, thus improving regulation relative humidity in the air. In addition, trees in accordance with the Kingdom but also the survival of mankind depends on the protection of the environment play an important role. We know that strong winds can increase soil evaporation, reduce soil moisture, causing soil erosion. The formation of severe sandstorms can be buried towns and farmland. According to the United Nations in 1984, every year 600 million hectares of land buried by sand, 2100 million hectares of land due to desertification and loss of income, the world's 1 / 3 of the risk of desertification of land, and called on the international community to halt some of the world region to fight desertification. "To live sand, it is necessary more than planting trees." Sand-fixing tree planting is an effective way to _set_ the shelter belt, to weaken the wind speed, wind and sand erosion block migration. Trees are scarce in the mountains is easy to form "drought the rain look forward to, rain washed one, fertilizer and soil away, leaving the stone egg" miserable scene. The variations in crown and branches of trees can block block rain showers in the strength of mitigation can be effective in preventing soil erosion, to conserve water. It is often said the "beautiful", "mountains" is the truth. However, if human nature against the law, it would have to be punished by nature. Six thousand years ago, China's Shaanxi and Gansu area is a scenic, vibrant places, always beautiful, towering trees, all over the carpet of green grass, flowers. But by the time of the Tang Dynasty, where the Castle was gone, clear water dried up, showing only that the people in front of the endless desert. Clear water into the desert where the Castle The reason is that we humans excessive logging of forests, endless grassland reclamation, long-term damage to vegetation, irrational exploitation of natural resources caused. 7,8 months of 1983 history of Sichuan province Rare Catastrophic floods inundated more than 1,250 county 53 acres of crops, food production of 30 billion kilograms, 1.6 million houses collapsed, the direct economic losses of 20 billion yuan. One important reason is that forest resources in Yangtze River during the Cultural Revolution suffered devastating damage, flood control capacity greatly reduced, resulting in serious soil erosion. We can see trees and green plants the Kingdom is indeed a very important human life has value, we humans are indeed related to the matter of survival for us humans, trees and how important the existence of the Kingdom of ah! We must look at the trees to the next level give us the Kingdom of the benefits of mankind. Kingdom of trees not only brought us food, timber, housing and work, but more important is that the trees by the Kingdom of the survival of mankind depends on the environment played a significant ecological benefits. It can not do anything else; is any other thing can not be replaced. If the human destruction of trees, and that is destruction of human beings to their homes. The actual tree worth how much? A professor at the University of Calcutta, India had done a scientific calculation. A medium-sized trees, calculated at 50 years of growth, the creation of direct and indirect value: $ 31,250 worth of oxygen production To prevent the value of $ 62,500 of air pollution $ 37,500 to maintain the value of land and water To prevent the loss of value of $ 31,250 to increase fertility Rain stalls for livestock provided to shield the value of $ 31,250 nest The value of $ 2,500 to make proteins Total $ 196,250 For our human survival, let us take good care of trees, care for trees Kingdom, love nature it! Climate and the trees: the trees in the world a wide range of shapes and sizes. Shape of their many "craftsman", which have a significant technology division, it is called climate.
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Temperature and the trees
Trees observed in major cities in China can also be found in many trees of wood and climate relations. North is a temperate climate, the use of broad-leaved deciduous trees for street tree species, and even sub-tropical regions of the Yangtze River as well. Because the summer sun in these areas are high altitude and temperatures, the sun blazing, when shade trees just to play the function of passersby. South until the winter cold rolling, the temperature dropped dramatically and then fall out of trees have leaves, generously let the warm sun on the sidewalk. But in the tropics, very long summer, even if the winter temperature is higher, thus taking more evergreen trees, shade throughout the year. In Guangzhou, Nanning, south China cities, street trees on both sides of the crown often connected, so that the road has become a loggia. Where the growth of a banyan tree called, in the warm tropical and subtropical southern region can survive the winter. The rainy season due to high temperature, humidity, pendulous aerial roots from the branches viability once the reach the ground, that is rooted in the soil, and gradually become a real tree, the support of these secondary trunks, branches can continue banyan grow horizontally, a few years later, can be unique among big banyan tree forest, and even an area of several acres.
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Rainfall and trees
If the temperature conditions to meet the needs of trees, then the trees can actually grow, and grow into what it was like, depends on how much precipitation. The following few examples. First, the world's tropical, subtropical and temperate arid areas, are due to the extreme lack of water as well as the growth of trees and grass can become a desert. Second, in tropical regions, only one year during the rainy season (summer), if less rainfall in rainy season, such as Africa, 500 ~ 1000 mm annual rainfall areas, is a savanna landscape (Savannah). Distributed sparse grassland with some trees shorter, generally has an umbrella canopy, which is probably the most famous monkey bread tree. The tree trunk thick, fleshy stem loose a large number of stored water. Fruit often weighs several pounds, edible starch pulp, so have the "monkey bread," said. Third, about 30 ° ~ 40 ° latitude of the continent around the West Bank, is a Mediterranean climate. There is still relatively warm in winter, the trees still grow. The major impact of precipitation on trees because of seasonal precipitation and heat mismatch. Mediterranean climate of the rainy season in winter and summer against a dry season. Trees to spend the long summer drought, which is not dense forest, trees are not high, the leaves were leathery and hard, and some, there are many hairs, not shiny, as hard-leaf evergreen forest. Olive is a Mediterranean climate the most important economic trees. Fourth, higher elevations, a wider range of mountains, the vegetation throughout the landscape can vary greatly. This was mainly due to the different topography and altitude caused by precipitation caused by the huge difference. Precipitation generally increased with increasing altitude. Therefore, in most typical cases, can occur on the foothills of desert and mountain forests of the miracle, for example, of the Tianshan Mountains, Qilian Mountain and so there is this happening. Windward leeward rainfall much more than ordinary, and thus meet the leeward mountain vegetation in the landscape can be very different. For example, the tropical monsoon area in southwestern Cambodia, face of the southwest monsoon in the Cardamom Mountains in southwest slope can be up to 3,000 mm of rainfall, the wettest Boge mountain even more than 5000 mm, which are the tropical rain forest landscape of Southwest slope , hierarchical trees, vines and climbing plants in the forest very much; but leeward northeast slope (including the capital, Phnom Penh area) because of the terrain effects, a significant decrease in annual rainfall, only 1,000 to 2,000 mm, so the sparse forest, single tree species, but also to the late dry season, plants in order to protect themselves and reduce the huge evaporation at high temperatures, even fall out of a leaf (ie, deciduous trees in the spring rather than winter), but it is still a tree! Xishuangbanna in China, I have seen in the winter and spring dry season, forest rubber, Yela Montreal, leaves, branches sparse situation. When precipitation is reduced to the leeward slope below the critical value, the vegetation can also be a qualitative change in the landscape. For example, China Daxinganling DP, face of the Pacific strainer Xia Xia spasm blowing mu alleviate heating Gui? 50 to 500 mm, temperate forests preserved everywhere, but the annual rainfall in the leeward western slope reduced to 250 ~ 300 mm, so boundless grassland, cattle drown sheep, then a "green and wild and fog, wind-swept pastures of cows and sheep" of the landscape. There is also the world even while the windward leeward forest to desert and semi-desert in the extreme cases, such as North and South America's west coast mountains.
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Wind and trees
In general, the wind does not affect the survival of trees, mainly only affects its shape. My Botanical Garden in Yunnan (Xishuangbanna Mengla Menglun) to see some trees, their diameter than the average person's arm is not much rough, but it can grow to about 20 meters high, it is clear they are bound to grow in no wind or small wind environment in. Indeed, only 96 kilometers near the annual average wind speed Jinghong weather station only 0.5 m / s, Xishuangbanna is one of the smallest wind speed area. As the wind speed increases, if all winds equal opportunities, in general, the tree will not have a major impact, compared with the static wind environment, just slightly different canopy minimizes Bale. But when the wind is rather simplistic, the local prevailing wind direction only one situation is different: the trees on one side face of the prevailing wind direction wind speed hit as often by the larger, leaving greatly accelerated evaporation of slow growth as well as new buds wither; The leeward side can continue to grow, so that the occurrence of asymmetric tree, called the wind on climate science into a partial-shaped tree. Tree shaped like a slightly upturned broom, broom tip that point to the direction of prevailing winds, a live weather vane. I January 1987 at the Kunming airport terminal before seen this type of partial-shaped tree. It should be noted that, in Kunming, although the prevailing summer southwest monsoon from the Indian Ocean up the winter prevailing winds from the west-southwest of south-west Asia, the prevailing westerly winds throughout the year, but generally there is no deviation form the city's trees occur. Kunming, not because the average wind speed (annual average wind speed is only 2.2 meters / second), and from southerly to westerly winds (at 16 azimuth statistics) between the average annual wind frequency and only 43%, in addition to the average frequency of 30% of the static wind outside , and 27% of the other wind direction frequency. But in the Kunming airport terminal before the plant community, because of its great east-west back against terminal, equivalent to half of the narrow tube, westerly winds in this increase, and become a single westerly winds that prompted the plant Most of the trees in the area became a partial form of the tree. Stop before the airport terminal sides of the road leading to each side shaped like a tree, because they are close to the building, thus partial-shaped with the most weight.
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Most trees
The highest in the world of trees The oldest tree species: is China's gingko tree. This tree first appeared in the world is one hundred and sixty million years ago during the Jurassic. Tallest trees: the Australian eucalyptus. Up to 155 meters, equivalent to as high as fifty layers room, the world has not found higher than its tree. The largest tree: the world of American Secretary. It's home in California. It grows in the mountains, not afraid of cold, huge trunk, the largest Sequoia tree, trunk circumference as much as 46 meters lower. The shortest tree: is the growth in the dwarf willow alpine permafrost, due to climate, it stems prostrate on the ground, the height of not more than 5 cm. The thickest tree: the Mediterranean and Etna mountain big chestnut. Week for up to 55 meters, there is a hole under a tree, can be used for storage and accommodation. The hardest tree: is the growth in Korea and China at the junction of iron birch. Shells hit the wood, like playing in the thick iron plate, as it is 3 times than the hard-oak, is the world's most hard tree. Heaviest tree: black rosewood. 1 cubic meter of Dalbergia dry weight over 1100 kg of wood. The slowest growth of the tree: It is the Kalahari Desert in Galway Z. tree. It is unusually slow growth rate of 100 years length 30 cm. Lightest of the tree: a tropical forest in the Americas Baasha wood, its timber, 0.17 grams per cubic meter, 10 meters high tree this tree, encircle thick, one can easily carried away. (Li Dongsheng) Most of the trees The hardest tree - Iron birch: in the areas bordering China and North Korea, the growth of the hardest wood of a tree, called the "iron birch." A great proportion of its timber into the water to sink, and no matter how long soak in the water, the internal nor decay. The lightest tree - Basha Wood: China Guangxi, Fujian, Yunnan, Hainan area, grows a "basa wood", which is the world's lightest tree, so called "light wood." It compared the cork tied to lighter skin twice. The tallest tree - Eucalyptus: in China, Guangdong, Guangxi, Fujian, Yunnan area, grows a tree in the towers, "Eucalyptus." It is not only growing rapidly, and quite tall, of the "blue gum" up to 70-80 meters high. Saltiest tree - tree wood salt: in Heilongjiang and Jilin, where the junction, grows a tree yields up salt, called "salt wood tree." Every spring, the trees have condensed layer of white Yanshuang, it can be scraped off gently with a knife when salt consumption. The most poisonous tree - curare wood: the dense forest in Xishuangbanna, Yunnan Province, there is a juice containing highly toxic trees, called "curare wood." Its white milk and touched the wounds of humans and animals can cause poisoning.
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Most trees
The highest in the world of trees The oldest tree species Is China's gingko tree. This tree first appeared in the world is one hundred and sixty million years ago during the Jurassic. The tallest tree If a high degree of industry competition organized by the World tree, then only the Australian eucalyptus almonds, are eligible to be first. Almond Eucalyptus are generally up to 100 meters, of which one, up to 156 meters, the trunk soared as high as a fifty story building. Has been measured in human trees, it is the highest one. Birds singing in the treetops, in the trees sounds like the hum of mosquitoes, the same. Around the base of this tree up to 30 m, trunk straight, up significantly thinner, dense branches and leaves students in the top of the tree. Ye Zaisheng very strange, the general surface of the leaf is overturned, and it is the side of the air, like hanging from a tree, as the direction parallel to the projection of the sun. This strange appearance is to adapt to the dry climate, strong sunlight, the environment, reduce direct sunlight to prevent excessive water evaporation. The shortest tree Why not grow alpine plants it? Where the temperature is very low, thin air, wind and large, direct sunlight, so that only those little plants can adapt to this environment. The thickest tree In Europe there is such an interesting legend: the king and queen of ancient Arabia, a leading Baiji troops, to the Mediterranean island of Sicily, Mount Etna tour, suddenly pouring rain, Baiji troops quickly to avoid a big chestnut tree, the tree just give them rain shade cover. Therefore, the king named to The big chestnut "Baiji big chestnut tree." In 1972, according to foreign reports, in Sicily's Mount Etna on the hillside, there are indeed called a "hundred horse tree," the big chestnut tree, trunk circumference as much as 55 meters or so, be over 30 staff in hand, can be surrounded it. Department has a big hole under the tree, where people have taken chestnut or warehouse used as dormitories. This is indeed the world's most thick trees. Chestnut chestnut fruit is a favorite food for the people, it is rich in starch, protein and sugar, high nutritional value, whether raw, fried, cooking, cooking cooking are suitable, not only sweet and delicious, but also There Spleen Bugan, strong body of medical effect. Volume of the largest tree Plants on the planet, and some individuals is very small, some very large individuals. Like the California redwood, tall and fat, is a tree in the "giant", so also known as Sequoia. The tree is about 100 meters tall, the tallest tree, 142 meters, 12 meters in diameter, trunk circumference of 37 meters, take two dozen adults to hold it. It is almost as thick from top to bottom, it has lived for 3,500 years the. People from the lower trunk of a hole, you can by car, or to walk side by side the four horsemen. Even after the tree cut down, people have to use the long ladder to climb up the trunk. If the tree trunk hollowed out, people can go into meter, from the tree branches of a tree hole in the crotch out. It's stumps, large enough to be a small stage. Almond Eucalyptus Although higher than redwood, but it is a lanky, giant sequoias of the volume it is not as big, so size Sequoia is the world's largest trees. Volume of the earth no more plants than it was. The economic value of Sequoia is large, the sleepers, poles and building on the good material. Sequoia fire wood is not easy, there is the role of fire. The biggest tree crown As the saying goes, "trees are good shade." Do you know what the largest number of trees for shade? This is a banyan tree to the number of Bangladesh, its crown can cover about fifteen acres of land, there is one and a half football fields. Bangladesh is not only leafy banyan tree, and it can take root from the branches down. Some of these roots hanging in the air from the air to absorb water and nutrients, called "aerial roots." Most aerial roots reach the ground, buried in the bar, play to absorb nutrients and support the role of the branches. Vertical aerial roots, resembled the trunk, the largest banyan tree roots can have more than 4,000, from a distance looked like a forest. Therefore, this banyan tree, also known locals as the "One tree forest." It is said that there was a six or seven thousand troops in a large banyan Xiasheng too cold. Local people, Bangladesh is still an old banyan tree, the start of a bustling, crowded market. There is nothing in the world again, this was a big canopy. The lightest wood tree Growth tropical forest in the Americas, light wood, also known as basa wood, is one of the fastest growing trees, but also the world's lightest wood. The evergreen tree, tall tree. Leaves as the Indus, five yellow petals of white flowers such as hibiscus, fruit dehiscence like cotton. China has long been introduced in southern Taiwan. 1960, in Guangdong, Fujian and other places are also widely cultivated, and grow very well. Balsa wood, only 0.1 grams per cubic centimeter, the same volume of water one-tenth of the weight. We do have to match sticks with the Topol three and half times more than its weight. Although its light texture of wood, but the structure is very strong, therefore, is the aviation, marine, and other valuable materials, special processes. Local residents have long used it as a raft to travel between the islands. China cork thermos with it. Heaviest tree: black rosewood. 1 cubic meter of Dalbergia dry weight over 1100 kg of wood. The slowest growth of the tree: It is the Kalahari Desert in Galway Z. tree. It is unusually slow growth rate of 100 years length 30 cm. Lightest of the tree: a tropical forest in the Americas Baasha wood, its timber, 0.17 grams per cubic meter, 10 meters high tree this tree, encircle thick, one can easily carried away. (Li Dongsheng) Most of the trees The hardest tree - Iron birch: in the areas bordering China and North Korea, the growth of the hardest wood of a tree, called the "iron birch." A great proportion of its timber into the water to sink, and no matter how long soak in the water, the internal nor decay. The lightest tree - Basha Wood: China Guangxi, Fujian, Yunnan, Hainan area, grows a "basa wood", which is the world's lightest tree, so called "light wood." It compared the cork tied to lighter skin twice. The tallest tree - Eucalyptus: in China, Guangdong, Guangxi, Fujian, Yunnan area, grows a tree in the towers, "Eucalyptus." It is not only growing rapidly, and quite tall, of the "blue gum" up to 70-80 meters high. Saltiest tree - tree wood salt: in Heilongjiang and Jilin, where the junction, grows a tree yields up salt, called "salt wood tree." Every spring, the trees have condensed layer of white Yanshuang, it can be scraped off gently with a knife when salt consumption. The most poisonous tree - curare wood: the dense forest in Xishuangbanna, Yunnan Province, there is a juice containing highly toxic trees, called "curare wood." Its white milk and touched the wounds of humans and animals can cause poisoning. ----- Tallest broad-leaved trees and Atlas Tree Shorea China's famous tropical forests in Xishuangbanna, Yunnan, in the 70's found a great trees, it was beautiful gesture, towering tree trunks, standing tall on top of the million trees, people can not look up to see it the tree top, even the high sensitive measuring device does not help here. Therefore, people call it heaven tree. Local Dai people call it the "umbrella tree." Shorea is generally up to 60 meters. It had a measurement and analysis, we found very fast growth of Shorea, a 70-year-old Shorea, as high as 50 meters. Individual or even as high as 80 meters, diameter generally 130 centimeters, maximum 300 centimeters. The rare earth giant trees, Keke stands in the upper valley rain forest, generally above the second layer of trees more than 20 meters, I really have through highest heaven, piercing blue sky spirit! Shorea is Dipterocarpaceae, Liu An is. Liu An is the family, a total of 11 members, most of them live in Southeast Asia. Parashorea only grows in Yunnan, China, is the specialty of the rare species in China. Look on the tall, straight tree, leaves alternate, pinnate veins, yellow flowers arranged in panicles, emitting bursts of fragrance. The fruit hard. General Growth Parashorea 700-1000 m in the valley rain and mountain rainforest, forming a separate community type, showing the unique natural landscape. Therefore, the academic community see it as a sign of the tropical rain forest tree species. Parashorea excellent material, rapid growth, high productivity, a trunk of Shorea volume up to 10.5 cubic meters per plant, average growth 0.085 m3, is 2-3 with times of other species in the forest. Therefore, it is worth promoting good species. At the same time, it is rich in rubber wood, flowers contain essential oils, and many other unknown components, pending further analysis of our research and use. Parashorea with such as a high scientific value and economic value, and its distribution range and extremely narrow, it is listed as a protected plant in China. There is also a very Parashorea pro's "twin brothers", named Atlas tree. It is actually a variant of Shorea, also in the 70s found in Guangxi. This Atlas tree shape is very similar to his brother, also extremely tall, often up to 60-65 meters, light sticks have more than 30 meters under the high. The material hard, corrosion-resistant and strong, and smooth planing surface, texture and beautiful, with high economic value and scientific value. Atlas found that the growth of the tree just get Gang Nature Reserve in Guangxi, so the same is strictly protected. Tree rings and the relationship between the environment After the trees cut down, you can see an interesting phenomenon, in the stump of the cross section, there is a different color circle, large and small concentric ring pattern. The concentric ring pattern is the "ring." The annual growth rings from the cambium activity generated. Spring, mild climate, abundant rainfall, the growth of trees Lee, then form a strong layer of cell division, newly generated cells in large and obvious, catheters and large and great, therefore, becomes the color of wood light, soft texture. Into After the summer, as temperatures increase, rainfall reduction; especially in the fall, the weather getting cold, less rainfall, cambium activity weakened, split out of the cell shape , Coupled with cell wall thickness, vessel and small, dense and hard wood look, color depth. Trees per year within the duct cells and repeat big to small, wood Qualitative change from the loose to dense, leading to the formation of color, texture and different ring pattern of a circle - ring. A ring represents the growth of trees has experienced a cycle of change in the environment, usually a change in climate is one year cycle, so also on behalf of the rings Table with the growth of the year. According to the number of rings, you can infer the age of the trees used to test the age of the forest. However, due to the formation layer of rhythmic Activities, sometimes within a year also can produce a few rings, called ring false. Such as citrus plants, one year can produce three rings. Therefore, the years Round of the calculated age of the trees, only an approximate figure. Growth rings of trees is not only used to calculate the age, from the ring's width, you can also learn through the trees and the trees and then the relationship between the local environment and climate. In excellent weather conditions, good growth of trees, the xylem increased much wider ring will; contrary to the narrow ring. For example, trees on the first Round of the generally wide, which means that when it is young and healthy, strong growth; sometimes a tree in the event of a number of narrow rings after the sudden appearance of a wide ring, This shows that the years in the ring width, environmental climate, favorable for tree growth. In addition, eccentric rings, it shows both sides of trees in different environments, Usually in the northern hemisphere than the north side of the south side of warm, so the south side of the ring is wider. Warm and cold temperature changes on the earth, generally a period of a cycle of 200 years. Through the ring between 1900 and 1960 changes in the research, found that in 200 In a large cycle, there is 33 years, 72 years, 92 years, a small 111-year cycle of climate change, most of them are multiples of 11 to 11.5 cycles. And 11 years, Just a cycle of sunspot activity, which also show that solar activity has a direct impact on the earth's temperature changes. Currently, there are already a specialized drill that can drill down from the bark of the tree has heart, took out a sheet with all the rings. This can no longer required Cut down trees to calculate the age of the trees. Variation of the ring through the research and its understanding of where the regional climate on development of ultra-long-term weather forecast And development of forest planning, there has been instructive.
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Duke explain it - the trees
* Dream of wandering in the forest - dream of wandering in the forest, the results are as follows: lover of the opposite sex by other fans, away from you, and so things will happen. Only one way to guard against, should we care for more of each other. * Dream of planting trees - a precursor to increased material transport. Perhaps a long absence, visiting elders, will send - pens to you, or be able to get the computer in a department store when the draw and so on. This way, more efforts need to be more academically not it! * Dream of withered trees - not very good fortune. It looks like you look very happy, in fact, is not forced to cancel an appointment, is to pass the loss, was very distressed. Do not be discouraged, more good work. * Dream of walking in the bamboo grove - the performing arts will have a good performance. Perhaps the singing contest at school get the rank, receive prizes, or wrote a fiction book review and appreciated by the teacher. * Dream of trees and ponds in the yard of a walk - making friends in good condition. You can organize a Friend Results Team travel activities, must be a happy trip. * Dream of ginkgo leaves strewn over the floor - there will be unfortunate aspect of love. Your love will be unrequited love, quickly put your attention to sports or other interests, the early oral treatment of heart wounds. * Grape fruit of their dreams - something unpleasant is about to happen. For example, overslept this morning, panic to get to school. At noon, the lunch box opened it, not only rice dishes ... ... * Dream of fruit trees laden with fruit - will be older people love, and you will fall in love with him. Do pay attention to your actions, must not be in too deep. * Dream of sparse growth of pine trees - the sick, hard to come. Peter trying to flaunt the most, do not over-confident of your strength. This time, health more than anything else! * Dream of switchgrass waving in the breeze - there will be unhappy in love, things. Star gossip from your head through, be careful not to be involved to the triangle, square relationships. Trees Category: First, the classification according to type of tree growth 1. Tall arbor tree (usually 6 meters to tens of meters), with a significant tall trunk. 2. Shrub small tree (usually 6 meters), low end of the trunk. 3. Rattan wood material can be twisted, or cling to its upward growth of woody plants (eg ivy). 4. Creeping type stem, branch Dengjun creeping to grow (such as paving Parker). Second, according to the adaptability of the classification of environmental factors 1. In accordance with the heat factor of tropical tree species and subtropical species, temperate and boreal tree species in sub-arctic species. 2. In accordance with the water factor can be divided into drought-resistant species (which can be fractional), moisture species (which can be fractional) 3. In accordance with the tree lighting factor positive, neutral numbers, negative tree, no class can be fractional. 4. In accordance with the air factor of wind species, anti-smoking and toxic gas species, anti-dust tree species and health care (that secrete volatile spinosad and useful human aromatic molecules) and other four categories. 5. In accordance with the acid soil factors hi species, alkali species, Low and coastal species. Third, according to classification of trees and ornamental features 1. Tours tree tree class (type of wood) 2. Foliage tree class (leaf of wood) 3. Flower tree classes (trees and flowers category) 4. Rewards fruit trees and class (fruit type) 5. Rewards category tree roots (root wood) Fourth, according to the use of trees in the garden 1. Independent tours tree (solitary tree planting, specimen trees and enjoy the tree-shaped) 2. Shade tree 3. Trees 4. Protection tree 5. Lin from the class 6. Landscaped class 7. Rattan wood 8. Zhi Lei and green sculpture 9. To be plant 10. Wuji Planting 11. Pile King Class 12. Indoor green decorative The beautiful landscape of eucalyptus Eucalyptus tall with a straight trunk, stem form a beautiful, strange and beautiful flower, fragrant and so on, with a high landscape value, is a good garden ornamental trees, tree species, suitable for the majority of rural areas around their houses, a field in planting, bring some wood in the same income, green the environment. The leaves of eucalyptus trees in a very unique community, and many state juvenile leaves of Eucalyptus leaves of various shapes and forming. Eucalyptus has a very special flowers and fruit. Strange fruit of Eucalyptus, very interesting, there are spherical, oval, altar-shaped, bell-shaped, hemispherical, cylindrical, conical, plow, gyro-shaped, bar and so on. Eucalyptus "bloom" when it is particularly beautiful, filaments red, white, yellow and other colors, the color gives the eucalyptus silk "flowers" extremely rich individual character. Ficus urophylla as bright red flower blossom is a very good view of flower species. Pinyin: shù Ⅰ noun 1. (Woody plants known) tree: willow willow; apple tree apple tree; planting plant trees2. (Name) a surname: Yuan Shu Yuan Ⅱ tree verb 1. (Planting; cultivated) plant; cultivate: ten trees , takes a hundred years. It takes ten years to grow trees, but a hundred years to rear people.2. (_Set_; established) _set_ up; establish; uphold: contribution achievement; tree ambitions have lofty ambitions; aim high; tree upright uphold [foster] healthy tendencies Wubi: SCF French: arbre Spanish: árbol Japanese: ki "Wood" Dictionary meaning 1 / woody plants in general. 2 / planting, cultivation. 3 / Li, establish (_set_): tree ambition, legislative aspirations.
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English Expression
n.: Trees, arbor, landmark, pine, wood, plant trees