论文部分内容阅读
识别磷素流失的关键源区,对合理实施养分资源管理、指导平衡施肥、有目的治理来源于农业养分造成的污染和农业的可持续发展有着重要的意义,本文以地理信息系统(GIS)的空间分析功能和养分平衡计算等方法为依托,参照国际常用的磷指数法对长江流域主要农用地进行了农业非点源磷污染风险评价,得到以下结论:磷非点源污染危险性指数高和极高的农用地,分别占到了流域农用地的24.40%和0.49%;风险低和中区域分别占到了11.16%和63.95%。长江流域为农用地磷污染风险中等的流域。
Identifying the key source areas for phosphorus loss is of great significance to the rational implementation of nutrient resource management and the guidance of balanced fertilization. It is of great significance that purposeful management is derived from the pollution caused by agricultural nutrients and the sustainable development of agriculture. In this paper, GIS (Geographic Information System) Spatial analysis function and nutrient balance calculation, the risk of non-point source phosphorous pollution in agricultural areas in the Yangtze River Basin was evaluated with reference to the commonly used international P index method. The conclusions are as follows: the risk index of phosphorus non-point source pollution is high and Extremely high agricultural land, respectively, accounted for 24.40% and 0.49% of the agricultural land in the basin; low risk and the central region accounted for 11.16% and 63.95% respectively. The Yangtze River Basin is a watershed with a moderate risk of phosphorus pollution in agricultural land.