徐州市沛沿河流域土壤保肥能力的实验研究

Study of the Capability of Nutrients Holding of Soils in the Pei River Basin of Xuzhou

对施用不同化肥的不同土壤进行了短期静态浸泡与换水浸泡模拟实验,研究了不同情况下各种土壤在受雨水短期浸泡时对氮、磷的吸附、释放现象.通过比较土壤对不同肥料的保肥能力,寻求合理的施肥方法.结果显示,不同土壤类型保肥、供肥能力差异较大.对浸泡实验数据按一级动力学模型进行拟合的结果表明,浸泡实验上覆水中TN、TP浓度变化较好地符合一级动力学模型.

Simulated short-term static submersion and water change submersion experiments are conducted on soils fertilized with different fertilizers to study the soils＇absorption and release of N, P under rain water short-term submersion. Through the study of the soils＇ capability of nutrients holding, more reasonable fertilization methods are supposed to be found. The results showed that. The nutrient preserving capability and the ability of fertilizer supplying are related to soil types. The TP and TN concentration curve well conform to the first order kinetics models.