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Evaluation of the Values for Ecological Service Function of Tropical Natural Forest in Xishuangbanna

ZHAO Yuan-fan,WEN Qing-zhong,TAO Jing,HUA Chao-lang,SONG Jing-xin,YANG Dong (Yunnan Institute of Forestry Inventory and Planning,Kunming 650051 Yunnan,China)  
The ecological service function of tropical natural forest in Xishuangbanna has been estimated.The total value is 100.233 billion yuan/a,in which the value for preserving watershed is 47.073 billion yuan/a,accounting for 46.96% of total value;value for biodiversity conservation is 27.775 billion yuan/a,accounting for 27.71%;value for nursery soil is 129.32 billion yuan/a,accounting for 9.84%;value for carbon fixation is 9.866 billion yuan/a,accounting for 9.84%;value for purifying air settings is 1.604 billion yuan/a,accounting for 1.60%;value for accumulating nutrient is 0.983 billion yuan/a,accounting for 0.98%.Generally,the value for ecological service function per unit area is 108.3 thousand yuan/hm2.a,equivalent to 1.96 times of national average level and 1.60 times of average level of Yunnan.
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