Rainforest

one of the world's tropical vegetation types. The climate is characterized by high temperature and rain, the average annual temperature of 20
to
28
degrees C, the temperature difference is small, the annual precipitation of up to
4000
to
6000
mm, relative humidity is high, sometimes up to
90
%, the soil is acidic brick red soil. The community is characterized by a wide variety of tree species up to
60
species in an area of
100
square meters, while the dominant tree species are not obvious. There are many layers, often
4
to
8
layer, but not obvious. Trees tall and straight, more than
30
meters, few branches, are evergreen trees, bud-free scales, smooth bark, light and thin, dark forest, old stem flowering and plate root phenomenon is more common, some also have pillar roots and angry roots (such as eucalyptus trees). The forest is rich in coarse rattan plants, such as provincial vines, yellow vines, up to tens of meters to
300
meters, some vines can form hanging plants (such as eucalyptus genus), attached tree trunks, branches or leaves on the algae, fungi, ferns and flowering plants (such as Tiennan Star, anchovies, Luo co) to form an air wreath. Rainforest distribution is limited to the north and south of the equator
5
to
10
degrees tropical range, the world is divided into
3,
regions, namely the Americas Rainforest (South America Brazil), the African Rainforest (Central African Congo, Gabon and Cameroon) and the Asian Rainforest (or Indo-Malaya Rainforest). China is only Taiwan, Guangdong, Guangxi, Yunnan provinces in the south and Hainan Province in the tropical north edge, it is generally believed that China is not a typical tropical rainforest in the above-mentioned areas, but also has the basic characteristics of the rainforest. The main tree species in China's tropical rainforest are the dragon brain incense (green skin, slope base, wangtian tree), Sankoh (wood pineapple) and nutmeg koko (Taiwan nutmeg). Rainforests, there are many plants of high economic value, precious wood tree species have oil dan, oil Nan, chicken hair pine, green skin, slope base, dragon brain incense, butterfly tree, Nanmu, etc.; Beverage plants have coffee, cocoa, fiber plants with cotton and swords, rubber plants with Brazilian rubber trees, has been widely cultivated, tropical fruits are extremely rich in bananas, pineapples, papayas, mangoes, wood pineapples, guava, sugar cane and so on.