磷素在土壤中的垂直迁移潜力研究

针对磷素在田间条件下是否可以发生垂直迁移存有的疑问，利用模拟土柱研究了渗漏液磷含量的变化特点。结果表明。淹水后土柱渗漏液中总磷、有机磷的变化基本上表现为逐渐升高而后有所降低的趋势；施磷肥和猪粪处理土柱渗漏液中的总磷量高于无磷肥处理；施猪粪处理土柱渗漏液中有机磷量明显高于施无机磷肥的处理。

The Potentiality of Phosphorus to Move Vertically in the Soil

Eutrophication has been identified as a major cause of impaired water quality,and phosphorus(P)export in runoff can accelerate the eutrophication of receiving fresh waters.P moving to underwater body appears to be difficult because of fixation function from soils,unlike reaching surface waters,which relatively easier.The question,whether Phosphorus taking place vertical transportation in the soil,remains not clear.Simulated soil column were supplied to probe into potentiality of P moving vertically in the soil,by the means of analyzing the dynamic change of P in the eluate.The results show that the total P(TP)and organic P(OP)in the eluate of soil column increased gradually and decreased after one month under flooding water.The TP quantities in the eluate of inorganic P and organic P fertilizer treatment is 1.69 and 1.31 times higher than that of no P treatment in No.1 soil column,1.18 and 1.59 in No.2.From 4 to 21 July in 2003,three analysis were undertook in which the increasing amplitude of organic P in the eluate of No.1 soil column compared with no P treatment reach 106.72%,71.43% and 113.76% in inorganic P treatment,as well as 180.55%,115.56% and 121.63% in organic P,respectively 40.00%,26.06% and 46.55%,as well as 91.93%,54.55% and 105.69% in No.2.This may be concluded that OP moving vertically to deep layer in soil,even to underwater,is easier than IP,but further fields experiment is needed to verify the findings from this simulated soil column study.