摘要
Total P (TP), total participate P (PP), total dissolved P (TDP), molybdatereactive P (MRP) and dissolved organic P (DOP) were determined in waters from pipe-drains (at 65-cmdepth) from the Broadbalk Experiment at Rothamsted Research, UK. Average TPand PP exceeded 1 mgL^(-1) in about half of the 12 plots receiving superphosphate for the 5 measurements taken betweenDecember 2000 and April 2001. Ranging between 33.8% and 87.3% of TP, PP was the largest P fractionin drainage waters, with DOP, ranging from 0.5% to 26.2% of TP, being the smallest fraction Meanproportions 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 muchlargerthan previously thought, and could therefore make a significant contribution to eutrophication.
Total P (TP), total particulate P (PP), total dissolved P (TDP), molybdate reactive P (MRP) and dissolved organicP (DOP) were determined in waters from pipe-drains (at 65-cm depth) from the Broadbalk Experiment at RothamstedResearch, UK. Average TP and PP exceeded 1 mg L-1 in about half of the 12 plots receiving superphosphate for the5 measurements taken between December 2000 and April 2001. Ranging between 33.8% and 87.3% of TP, PP was thelargest P fraction in drainage waters, with DOP, ranging from 0.5% to 26.2% of TP, being the smallest fraction. Meanproportions of PP, MRP and DOP in TP in drainage waters were 63.4%, 32.5% and 4.1%, respectively. These findingssupport previous findings that P losses from soil to drainage waters were much larger than previously thought, and couldtherefore make a significant contribution to eutrophication.
基金
Project supported by the Rothamsted International, UK
the Scientific Research Foundation for Returned Overseas Chinese Scholars, the State Education Ministry of China
and the Natural Science Foundation of Shaanxi Province, China (No. 2002D09).
