%0 Journal Article
%T Identifying Critical Source Areas for Non-point Phosphorus Loss in Chaohu Watershed<br>巢湖流域非点源磷流失关键源区识别
%A ZHOU Hui-ping
%A GAO Chao
%A <br>周慧平
%A 高超
%J 环境科学
%D 2008
%I 
%X Agricultural non-point phosphorus (P) pollution is an important cause of eutrophication in many freshwater systems. Identifying areas that at high risk for P loss to surface water in watershed and concentrating management efforts on these minimal portions of lands are better measures than implementing general strategies over a broad area. A modified version of P index was used to assess P loss risk and identify critical source areas in Chaohu watershed at a regional scale. Soil P sorption index and degree of P sorption saturation were introduced as source factors to show the inherent ability of P transport in soil-water interface. Distance from sources to Chaohu Lake was also considered as a new transport factor to show the influence from sources to final receiving water. The ranking schemes were modified according to available data and scale of study area. The soil P sorption indexes show mild spatial variations in watershed. However, the values are relative low which implies higher loss risk. Distinct spatial variations are found in the degree of soil P sorption saturation. More than 40% of the watershed is saturated over 25% by P. The results show prominent spatial variations of non-point P pollution risk index in Chaohu watershed. Highest risk areas, take up about 5% of the watershed, spread near the downstream parts of main rivers to Chaohu Lake. These should be regarded as critical source areas to be treated in priority. It indicates that P index is a rapid and simple tool to identify critical source areas of non-point P pollution at the regional scale and it enables managers to implement best management practice (BMPs) in a high priority to minimize P loss to sensitive watercourses.
%K agricultural non-point source pollution
%K P index
%K critical source area
%K Chaohu watershed<br>农业非点源污染
%K 磷指数
%K 关键源区
%K 巢湖流域
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=772C300BCE9EAD2F0D141F811318FFE6&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=F3090AE9B60B7ED1&sid=E5EFCED4B68E0E0D&eid=05FD3A2801CC52CD&journal_id=0250-3301&journal_name=环境科学&referenced_num=15&reference_num=50