滇池水质1999-2008年时空变化特征

以滇池常规的水质监测数据为基础，运用因子分析法对滇池1999-2008年的水质进行综合评价，并以水质综合评价得分作为监测点位的空间属性值，采用空间插值法定量分析10年间滇池水质的时空变化特征。研究期间内，滇池水质总体呈现不断恶化的趋势，氮磷污染一直是滇池的主要污染类型。滇池南部区域水质一直优于北部和中部区域，尤其是草海和外海交界区域的水质在全湖是最差的。南部片区水质在整个滇池最好，但也呈现出不断恶化的趋势。

Spatial and Temporal Trends in Water Quality of Dianchi Lake from 1999 to 2008

The study on the long -term change of water quality in Dianchi Lake discloses the changes of water quality.It will provide a base for the water management of Dianchi Lake.Multivariate analysis was employed to e-valuate the water quality of Dianchi lake from the year of 1999 to 2008 based on the water monitoring data.The scores of the evaluation were exported as the attribute values of the monitoring sites in ArcGIS software.Inverse dis-tance weighted （IDW）method was adopted to quantify the spatial trends of water qualitiy of Dianchi Lake.The wa-ter quality of Dianchi lake has become worse and worse during the study period.Nitrogen and phosphorus have been the main pollutants.The water quality in the south of Dianchi lake is better than that in the center and the north.The intersection area between Caohai lake and Waihai lake had the worst water quality.Although the south-ern part of Dianchi lake had a better water quality relatively than other areas,the scores indicated a degrading trend from 1999 to 2008.