原状土壤磷容量与有效磷释放速率的关系

THE RELATION BETWEEN THE PHOSPHORUS CAPACITY OF UNDISTURBED SOIL AND THE RATE OF RELEASING AVAILABLE PHOSPHORUS

以磷为例，用ＥＤＴＡＮａ２预处理阴离子交换膜，连续测定２１ｄ，探讨了原状土壤剖面释磷速率与土壤速效磷，以及全磷、有机磷、铁磷、铝磷和钙磷等主要形态磷容量的关系。结果表明，在田间持水量下，土壤铁磷和铝磷容量都是释磷的源泉，尤其是铁磷和铝磷容量之和与释磷量呈极其显著的正相关。

Soil phosphorus test was taken as an example to study the relation between the rate of releasing phosphorus on undisturbed soil profile and the soil phosphorus capacity. In this study, an anion exchange membrane was treated with EDTANa 2. Some soil samples were tested successively for 21 days to determine the releasing rate of phosphorus on undisturbed soil profile by the ion exchange membrane. The capacities of soil available P,total P, organic P,FeP,AlP and CaP were also determined. The results show that both the FeP and the AlP in the soil are resources of released phosphorus when the soil moisture is of the field capacity, and the capacities of FeP and AlP has an especially significant direct correlation with the amount of phosphorus released. The FeP and AlP of upland soil in Xianning will continually be releasd for over 4.5 years.