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Li Yide Wu Zhongmin Zeng Qingbo Zhou Guangyi Chen Bufeng(The Research Institute of Tropical Forestry,CAF,Guangzhou,510520,China)Fang Jingyun(Research Center for Ecoenvironmental Sciences,Academia Sinica,Beijing,100085,China)  
Summarized the results of carbon pool and carbon dioxide dynamics of the pristine ecosystem of tropical mountain rain forest at Jianfegling,Hainan Island.The results indicate that:(1) the carbon pool of the forest ecosystem consisted of three main parts with a total amount 342t/hm~2 (converting into carbon dioxide up to 1254t/hm~2),of which the forest biomass pool occupied 234.31t/hm~2,litter fall pool 2.98t/hm~2 and forest soil pool 104.696t/hm~2; (2) the basic dynamics of carbon dioxide in the forest ecosystem lists as:the CO_2 amount assimilated for gross productivity by forest community was up to 74.28t/hm~2·a,of which the respiration consuming by the community was calculated about 42.69t/hm~2·a,and the net amount of assimilated CO_2 remained of 31.59t/hm~2·a On the other hand,the forest community released the CO_2 by respiration of litter fall layer and forest soil which the amount was 3.26 and 26.96t/hm~2·a respectively.So the CO_2 budget of forest ecosystem could be known,that was 1.366t/hm~2·a CO_2 or 0.3725 t/hm~2·a C to be fixed in forest ecosystem.It is obvious that recovering,developing and protecting the tropical forest is one of the most important steps to solve the globe ecological problems especially the consistent increas of CO_2.
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