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《JOURNAL OF BEIJING FORESTRY UNIVERSITY》 1994-03
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Analyses of Functions of the Puwa Ecosystem

Xu Ming;Zheng Dawei Liu Zhongli;Cai Dihua;Tang Guang(Beijing Municipal Meteorology Bureau,Beijing 100081)  
Based on the investigated data(form 1988 to 1990) this paper deals with theproductivity,nutrient cycle and energy flow of the Puwa ecosystem。The productivity of thisecosystem is very low,the solar energy utilization ratio of the whole ecosystem is only 0.096percent and the agricuItural subecosystem is only 0.258 percent.The deficit of nitrogen is se-rious(as to 69 277.6 kg/a)but phosphorus is a little more than needed in the current ecosys-tem. The artificial supplementary energy is deficient and thus limits the increase of productiv-ity,especially in the agricuItural subecosystem。
【Fund】: 北京市“八五”重点课题
【CateGory Index】: S181
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