模拟降雨条件下施肥方法对坡面磷素流失的影响

摘要/Abstract

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.

关键词: 施P方法, P素形态, P素流失, 模拟降雨, 留一交叉验证, 温室, DSSAT, CROPGRO-Tomato, 模型, 番茄

Abstract: Asimulated 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 Papplied into soil. Under mixed application (MA), the dissolved phosphorus (DP) concentration, BAPconcentration, DP/BAPand BAP/TPratio in runoff were all the highest, and those under point application (PA) were the second. Under line application (LA), DPand BAPconcentrations were low, DP/BAPand BAP/TPratio were also relatively low, and the difference compared with control was insignificant. According to the reduction of Ploss, the order of the three Papplication methods was LA>PA>MA.

Key words: CROPGRO-Tomato, DSSAT, greenhouse, tomato, model, leave-one-out cross-validation.

中图分类号:

S157.4
X501

李裕元, 邵明安. 模拟降雨条件下施肥方法对坡面磷素流失的影响[J]. 应用生态学报, 2002, (11): 1421-1424.

LI Yuyuan, SHAO Ming'an . [J]. Chinese Journal of Applied Ecology, 2002, (11): 1421-1424.

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