滇池东大河流域土壤磷素累积规律及空间分布特征研究

滇池是中国水体富营养化最严重的湖泊之一,磷是造成滇池有害藻类"水华"的限制因子。本文以滇池南岸主要入滇河流——东大河为研究对象,探讨了流域内磷素的累积规律及空间分布特征,结果表明:①流域下游有显著的磷素累积。②土地利用类型对流域土壤磷素累积有显著影响,设施农业是土壤磷素累积的最主要土地利用类型。③流域东北部靠近滇池的区域是磷素累积最严重的区域。

Soil Phosphorus Variation, Accumulation and Spatial Distribution in Dongda River Basin, Dianchi Lake

Dianchi Lake is one of the most serious of eutrophication of lakes in Western China. Phosphorus is considered as the limiting factor causing for eutrophication and harmful algal blooms in Dianchi Lake. In this study, Dongda River basin, one of the rivers entering into Dianchi Lake, was chosen and the phosphorus forms and spatial distribution were investigated. The results showed that: 1) the phosphorus was significantly accumulated in downstream. 2) Land use type had significant impact on phosphorus accumulation, and facility agriculture was the most important factor in the accumulation of soil phosphorus. 3) The phosphorus was most heavy in northeast of the study area near the Dianchi.