摘要
采用人工模拟降雨的方法，通过野外径流小区试验，研究不同施磷水平（0，30，75，150kg／hm^2）下，典型蔬菜地磷素径流流失的特征、流失形态及流失量．结果表明，不同形态磷素随降雨-径流过程的变化趋势基本一致，即初始阶段浓度大且下降速度快，大约产生径流20min后，浓度下降变得缓慢，直到最后趋于稳定；在整个降雨-径流过程中，颗粒态磷（PP）占总磷（TP）72％-87%，是土壤磷素径流流失的主要形态．在不同施磷水平下，不同形态磷的径流平均浓度由大到小的顺序是150，75，30，Okg／hm^2．利用Duncan新复极差法进行多重比较，发现在不同施磷处理T（0，30，75，150kg／hm^2）下，随着施磷量的增加，径流中溶解态总磷（DTP）、溶解态无机磷（DIP）、PP和TP的流失量增加，而且增加的趋势与施磷量呈显著线性相关关系．
Field runoff plot experiments were conducted in the typical vegetable plots of Taihu watershed. The effects of different phosphorus levels （0,30,75,150kg/hm^2） on characteristics and forms of soil phosphorus loss in runoffby artificial rainfall studied. Phosphorus concentrations of different forms in runoff were high at the early stage, then gradually decreased with time and finally reached a comparative steady stage after about 20 min of runoff generation. At the entire rainfall-runoff process, PP occupied 72%-87% of TP, PP was main loss form of soil phosphorus. Flow-weighted mean concentrations of soil phosphorus loss at different phosphorus levels followed the order from large to small： 150,75,30,0kg/hm^2. Multiple compare was carried out utilizing Duncan＇s New Multiple Range Test. The runoff losses of DTP, DIP, PP and TP in runoffsignificantly increased in linear fimction with phosphorus fertilizer increase at different P levels.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2007年第4期518-523,共6页
China Environmental Science
基金
国家自然科学基金资助项目(40371111)
关键词
磷肥
土壤磷素
径流
人工模拟降雨
磷素流失量
phosphorus fertilizer
soil phosphorus
runoff
artificial rainfall simulation
phosphorus loss
