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Law of Phosphorus Loss and Its Affecting Factors in Red Soil Slopeland

CHEN Xin 1 JIANG Shu qian 1 ZHANG Ke zhong 2 BIAN Zhuo ping 2 (1.Agroecology Institute, Zhejiang University, Hangzhou 310029; 2.Meteorologic and Agricultural Bureau of Deqing County, Zhejiang Province)  
The Paixichong small watershed, belonging to red soil hilly area, located in northern Zhejiang province,was selected as a case studying temporal distribution of phosphorus loss and its affecting factors. The results are shown as follows: (1) Particulate phosphorus (PP) in the runoff was the major form of phosphorus loss in slopeland,which contributed 66.25%~79.27% of the total phosphorus (TP). (2) In a year, serious phosphorus loss occurred in June, July and August. In this period P loss occupied 60% of total loss in a year. (3) Factors affecting the temporal distribution are rainfall and farming activities (plowing, weeding , fertilizing, planting ). It suggests that P loss can be avoided by adjusting the time of farming activities and adopting rational farming management.
【Fund】: 国家自然科学基金
【CateGory Index】: S158.5
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