%0 Journal Article
%T Risk Assessment of Nitrogen and Phosphorus Export in Upper Reach of Daliao River Watershed<br>大辽河流域上游非点源污染输出风险分析
%A LIU Rui-min
%A HE Meng-chang
%A WANG Xiu-juan
%A <br>刘瑞民
%A 何孟常
%A 王秀娟
%J 环境科学
%D 2009
%I 
%X With the development of point pollution control, non-point source pollution has become an important environmental and water quality management problem. Land cover composition across a watershed is a dominant factor in controlling the amount of nitrogen and phosphorus exported from a watershed. Generally, urban and agricultural land covers are considered as principal sources of excess loads of nitrogen (N) and phosphorous (P) in receiving waters. A well developed literature of nutrient export coefficients by land-cover class was used to model the risk of equaling or exceeding specified levels of nutrient export in drainage basin of Dahuofang Reservoir. The model was applied to about 513 comparatively small watersheds mapped for the drainage basin of Dahuofang Reservoir for environmental analysis and planning. The results suggest that the probabilities of risk are 19.31% and 8.95% for N and P nutrient respectively. As the spatial distribution concerned, risk estimates generally differed with different slope degrees and districts. Risk estimates generally increased from the places where lies near the rivers to the places where are far from the river, but numerous areas of high variability were evident.
%K drainage basin of Dahuofang Reservoir
%K NPS pollution
%K export coefficient
%K risk assessment<br>大伙房水库控制流域
%K 非点源污染
%K 输出系数
%K 风险分析
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=1D32BEFF635C518AAF3F6E0F4784DF0B&yid=DE12191FBD62783C&vid=340AC2BF8E7AB4FD&iid=38B194292C032A66&sid=46FF101E7ECF9F15&eid=06DAE5E1DF7D0B6A&journal_id=0250-3301&journal_name=环境科学&referenced_num=12&reference_num=25