太湖地区侧渗水稻土连续施磷处理下稻田磷的径流损失  

Phosphorus loss with runoff from a side bleaching paddy soil under continual P application in Taihu Lake Region.

作　　者：赵建宁[1] 沈其荣[1] 冉炜[1] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210095

出　　处：《农村生态环境》2005年第3期29-33,共5页Rural Eco-Environment

基　　金：国家重点基础研究发展规划项目(G1999011806)

摘　　要：太湖地区侧渗水稻土稻田磷素动态特征及其潜在环境效应的田间测试结果表明,水稻地上部收获带走的磷量平均为47.5kg·hm-2;土壤表层0—10cm富集的磷、整个稻季径流流失的溶解态磷、颗粒态磷和总磷与施磷量呈线性相关关系。水稻生长季由径流损失的总磷量约在1.3～5.1kg·hm-2,损失量随施磷量的增加而增加。过量施肥会增加磷素径流流失风险,在当地施磷量30kg·hm-2条件下,水田磷素流失量相对很小。太湖地区侧渗水稻土稻季建议施磷量为50kg·hm-2。A field experiment was conducted to estimate quantitatively P loss from rice fields applied with different rates of P fertilizer.The ground parts of the crop removed about 47.5 kg·hm^(-2) P from the paddy field.The quantities of P loss with runoff and the amounts of P enrichment in the (0-10) cm surface soil were linearly related to the rates of P application.The loss of total P with runoff ranged from 1.3 to 5.1 kg·hm^(-2) and increased with the P application rate.It could be concluded that although excessive P application would increase the risk of P loss with runoff from the paddy field,the amount of P loss in the side bleaching paddy soil was low at the present local P application rate,and that the application rate of 50 kg·hm^(-2) P during the rice growth season in the side bleaching paddy soil was acceptable.

关 键 词：径流 田面水 总磷 溶解态磷 颗粒态磷 

分 类 号：S143.2[农业科学—肥料学] S273.29[农业科学—农业基础科学]