滇池流域表层土壤磷素演变与积累特征研究

为了提供滇池富营养化治理的科学依据，本研究以滇池流域不同类型的表层土壤磷素为研究对象，主要研究了滇池流域表层土壤磷素的演变与累积特征。结果表明，近20年滇池流域表层土壤全磷、速效磷和水溶性磷的含量均随时间的推移而显著累积；不同土地利用类型，土壤全磷、速效磷和水溶性磷含量顺序一致，均为：大棚土壤＞耕地土壤＞建城区土壤＞林地土壤，土壤全磷、速效磷和水溶性磷之间含量存在显著相关性。滇池流域土壤磷素含量都已经达到了极丰富水平，累积特征明显，磷污染风险很高。

Research on Surface Soil Phosphorus Evolution and Accumulation Characteristics in Dianchi Lake

In order to provide the scientific basis for governance of Dianchi Lake, the surface layer of soil phosphorus studied different types of Dianchi Lake Basin, the author mainly studied the evolution of the surface soil phosphorus in Dianchi Lake Basin and accumulation characteristics. The results showed that: Dianchi Lake surface soil total P, Olsen-P and water soluble phosphorus content of both would accumulate by the passing time and would continue in the coming 20 years. Regarding the different land utilization type, the entire phosphorus, the content order of fast-acting phosphorus and the water-soluble phosphorus was consistent, which was: the big awning soil>plants crops the soil>to construct the city soil>the forest land soil. The content of entire soil phosphorus, fast-acting phosphorus and water-soluble phosphorus was remarkably relevant. The accumulation of phosphorus was apparent and of a high risk of loss, therefore the problem of phosphorus loss was urgent to be solved.