连续施用氮、磷化肥对黑土胶体性质及酶活性影响的研究

THE EFFECTS OF APPLYING N P FERTILIZERS CONSTANTLY ON THE PROPERTIES OF COLLOID AND MAIN ENZYME ACTIVITIES IN BLACK SOIL

摘要:

本试验是在东北农学院院内黑土上, 于1982年开始的化肥长期定位试验的基础上, 初步研究了连续施用氮、磷化肥对黑土胶体性质及酶活性的影响。结果表明, 连续施用化肥(N、P)使胶体比表面积增加, 有利于胶体对磷的吸附和固定, 使土壤胶体保水性减弱。氮、磷化肥对土壤脲酶活性没有影响, 对过氧化物酶活性有抑制作用, 而对中性磷酸酯酶活性的影响较复杂, 尚待更长期的定位试验加以研究。

Abstract:

The results of the experiment showed: The specific surface area of Colliod and the amount of absorbed P were incrcased: the water retaining Capacity was decreased with the increasing of N and P applied and experiment time. The activity of urease in soil was not effected and catalases was restricted by N and P applied, The effect of N、P applied on neutral Phosphatase was showed complicatedly and should study further in the future.