土壤中氮磷和滇池水体污染的潜在关系

从不同角度探讨滇池水体氮磷污染是十分重要的。通过对滇池东南岸的大渔乡台地土壤氮磷量、地表径流氮磷量以及滇池氮磷污染状况进行研究。结果表明,台地土壤总磷量远高于我国农业土壤主要养分的分级标准的高量值,达7.5倍;速效磷则超过分级标准高量值的20倍。在面源污染中,滇池周边土壤高磷量是滇池磷污染的重要途径之一。地表径流磷含量超过地表水Ⅴ类标准。尽管土表层中氮量不是太高,但地表径流氮含量超过地表水Ⅴ类标准。研究还表明,土壤中氮磷通过地表径流的方式流失是一个缓慢的、复杂的过程,土壤氮磷并不是几次降水后就流失殆尽的。土壤中氮磷对滇池的污染也是一个逐步的、潜移默化的过程。

Potential Relationship between Soil Nitrogen & Phosphorus Content and Water Pollution in Dianchi Lake

It was very important to approach the nitrogen & phosphorus pollution in Dianchi Lake from different angles.The contents of nitrogen and phosphorus in the soil with platform structure and runoff in Dayu Township which is located in the south-east bank of Dianchi Lake,were analyzed,the contents of these two elements in the water of the lake were also measured.The results showed that the total phosphorus content in the platform soil was 7.5 times higher than the highest content of the classification standard ...