北方半干旱地区棕壤总磷流失特点试验研究

Experimental study on loss of total phosphorus in brown soil in northern semi-arid area

采用直接套取土柱的方法采集原状棕壤土,通过模拟降雨和灌溉试验,分析了棕壤总磷流失的特点。结果表明:下渗率是影响总磷流失量的最主要因素;疏松性棕壤总磷主要通过下渗方式流失,密实型棕壤主要通过径流方式流失;灌溉条件下棕壤总磷流失量与时间成指数函数关系,累计流失量与时间成幂函数关系。

Undisturbed brown soil was directly collected through casing pipes. An experiment of simulated rainfall and irrigation was conducted to study the loss of total phosphorus in brown soil. The results indicate that： （1） infiltration is the main factor affecting the loss of total phosphorous; （2） the loss of total phosphorus is mainly through infiltration in loose brown soil and through nmoff in dense brown soil; and （3） when there is irrigation, an exponential function relation exists between total phosphorus loss and time, and a power function relation exists between its accumulation and time.