典型都市农业村域果园土壤磷素的渗漏特征研究——以上海南汇新场镇果园村为例

Study on the Leakage Characteristics of Soil Phosphorous in an Orchard in the Urban Agricultural Region of Shanghai

以上海都市农业区域南汇新场镇果园村为例,通过测定施肥组和对照组,不同深度三层土壤溶液中可溶性总磷(DTP)和可溶性磷酸盐(DRP)的浓度,研究了桃园耕作层土壤磷素渗漏特征。结果表明,可溶性正磷酸盐能随降雨或灌溉而渗漏,但主要发生在表层,渗漏强度随土层深度增加而降低;表层磷素较低的土壤随降雨可溶性总磷(DTP)浓度逐渐降低。而施磷肥的土壤表层随降雨可溶性总磷显著升高,中层和底层则逐渐降低;所研究土壤可溶性磷含量均较高,对地下水的富营养化具有较大的潜在威胁。

In order to better understand the leakage characteristics of soil phosphorus in villages of an urban agricultural region, the concentration of soluble total phosphorus （DTP） and soluble phosphate （DRP） in different depth of three-layer soil solution about the fertilizing plot and the control plot were detected, and the phosphorus leakage characteristics of peach orchid arable layer soil were studied. The results showed that the soluble orthophosphate leakage with rainfall or irrigation, but mainly in the surface. Leakage intensity decreased with soil depth; soluble total phosphorus （DTP） concentration gradually reduces with rainfall in the soil with lower surface phosphorus. The surface of soil applied with P fertilizers has significant increased soluble total phosphorus during rainfalls, while soluble total phosphorus of middle and bottom layers gradually reduced; The soluble phosphorus of soil we studied were higher, which has a greater potential threat to cause groundwater eutrophication.