摘要
采用模拟降雨的方法研究了 3种施肥方法对P素流失形态与流失过程的影响 .结果表明 ,P肥在土壤中的混匀程度越高 ,则越容易导致生物有效P(BAP)的流失 .混施条件下 ,径流中水溶态P(DP)与BAP含量、DP/BAP与BAP/TP(总P)比值均较高 ;其次为穴施 ;条施条件下DP、BAP含量最低 ,DP/BAP与BAP/TP比值也相对较低 ,与对照间的差异不明显 .施肥方法对径流中TP含量影响较小 .从减少P素肥料流失的角度来讲 ,3种施肥方法作用大小顺序为 :条施 >穴施 >混施 .
A simulated rainfall experiment was conducted to study the effects of three phosphorus application methods on phosphorus loss and its forms in loss process. The results showed that the bio available P (BAP) loss in runoff was positively correlated to the mixed intensity of P applied into soil. Under mixed application (MA), the dissolved phosphorus (DP) concentration, BAP concentration, DP/BAP and BAP/TP ratio in runoff were all the highest, and those under point application (PA) were the second. Under line application (LA), DP and BAP concentrations were low, DP/BAP and BAP/TP ratio were also relatively low, and the difference compared with control was insignificant. According to the reduction of P loss, the order of the three P application methods was LA>PA>MA.
出处
《应用生态学报》
CAS
CSCD
2002年第11期1421-1424,共4页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 1860 5 )
国家杰出青年基金资助项目 (4 0 0 2 5 10 6) .
