宜兴梅林小流域磷素的迁移规律

Law of phosphorus transportation in Meilin watershed in Yixing

采用野外采样和室内实验分析相结合的方法,在自然降水条件下对环太湖丘陵区梅林小流域进行农田磷素随径流迁移输出特征的实验研究。结果表明:磷素主要以无机磷输出,总磷和可溶性正磷酸盐浓度随径流量变化,径流前期其浓度快速上升,后期趋于稳定;悬浮态磷和可溶性磷占总磷的百分比与下垫面和植被等因素有关,出口主要以可溶性磷输出;磷素淋溶主要是可溶性磷,且峰值滞后于降雨。此外,根据实验结果结合国内外理论与实践提出一些建议措施。

Using indoor laboratory analysis combined with field sampling, a study was conducted in the Meilin watershed in the hilly area around Taihu Lake to evaluate the characteristics of agricultural phosphorus losses with runoff under natural rainfall conditions. The results indicated that phosphorus loss was mainly in the form of inorganic phosphorus. Total phosphorus and soluble phosphate concentrations varied with runoff, increasing rapidly at the beginning of runoff and tending to be stable later on. The percentages of suspended phosphorus and soluble phosphorus in the total phosphorus were affected by the underlying surface, vegetation, and other factors. Soluble phosphorus was the main output form from outlet. Leached phosphorus was mainly in the form of soluble phosphorus, and the peak of concentration lagged behind that of runoff. In addition, some measures were proposed according to experimental results combining theory and practice from China and elsewhere.