【摘 要】
：
Total P (TP),total particulate P (PP),total dissolved P (TDP),molybdate reactive P (MRP) and dissolved organic P (DOP) were determined in waters from pipe-drain
【机 构】
：
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Rothamsted Research
论文部分内容阅读
Total P (TP),total particulate P (PP),total dissolved P (TDP),molybdate reactive P (MRP) and dissolved organic P (DOP) were determined in waters from pipe-drains (at 65-cm depth) from the Broadbalk Experiment at Rothamsted Research,UK. Average TP and PP exceeded 1 mg L-1 in about half of the 12 plots receiving superphosphate for the 5 measurements taken between December 2000 and April 2001. Ranging between 33.8% and 87.3% of TP,PP was the largest P fraction in drainage waters,with DOP,ranging from 0.5% to 26.2% of TP,being the smallest fraction. Mean proportions of PP,MRP and DOP in TP in drainage waters were 63.4%,32.5% and 4.1%,respectively. These findings support previous findings that P losses from soil to drainage waters were much larger than previously thought,and could therefore make a significant contribution to eutrophication.
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