Through the controlled experiment on seepage rate of the inundated rice paddy by the use of lysimeters, the changes of total phosphorus (TP) concentration of the surface and underground water caused by different seepage rate were studied at various growth stages.The results showed that the main reason of the rising of TP concentration in surface water during irrigation was the disturbance of the topsoil caused by irrigation accelerating the release of soil phosphorus.Especially before the compaction layer was formed on the surface of the rice field, a large number of soil phosphorus particles would be separated out by irrigation or rainfall.Due to precipitation, the TP concentration of the surface water was decreased apparently after 3-5 days inundation.The seepage rate had a significant influence on the TP concentration of surface water at earlier inundating stage, but no significant influence on that of underground water.%通过蒸渗测坑进行淹水稻田不同渗漏强度控制试验,研究水稻各生育阶段中不同渗漏强度下地表水及地下水TP浓度变化.结果表明:稻田灌水扰动田表土壤颗粒,加速了土壤磷的释放,是淹水过程中地表水TP浓度升高的主要原因,尤其在田表面没有形成板结层之前,灌水或降雨会使土壤磷颗粒大量析出;淹水3-5 d后,由于沉淀作用,地表水TP浓度明显降低;渗漏强度对淹水前期稻田地表水TP浓度影响较为显著,对地下水TP浓度影响不显著.
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