雷州桉树人工林下土壤磷肥活化效果及机理研究

Research on Activation Effects and Mechanisms of Phosphatic Manure in Soil under the Eucalypt Plantation in Leizhou Peninsula

应用不同活化剂处理不同性质的磷肥 ,对其在玄武岩母质的桉树人工林土壤中的生物效应及其作用机理进行了研究。结果显示 :(1)在玄武岩桉树人工林土壤上 ,施活化剂处理磷肥均能显著地提高桉树生长量 ,其中经有机 2号活化剂处理后的磷矿粉增加生长量最大 ;有机活化剂的最适使用农度为 5 %。 (2 )玄武岩桉树人工林土壤中的Fe、Mn与P素有效性关系密切 ,且在还原条件下的土壤Mn对磷的固定作用更大 ;Si有利于土壤中P的释放 ;适量的Ca也有利于提高P的活性 ;(3)供试活化剂不仅可促进难溶P的释放 ,还可控释水溶性P ,使土壤供磷性能平稳。 (4)在玄武岩砖红壤—桉树体系中 ,活化剂对P的促释和控释机理在于通过对土壤Fe、Mn。

Several activation agents were used to treat various phosphate fertilizers and their biological effect and mechanism in soil under the eucalypt plantation on basalt latolol were studied. The results are as follows: (1) The growth of eucalypt increased markedly in soil under the eucalypt plantation on basalt latolol when potted plants were tested by a few activation matters to examine the phosphatic manure. The phosphorus powder treated by activation agent No. 2 can promote the increment of eucalypt trees significantly. The feasible concentration of organic activation agent is 5%. (2) The Fe and Mn elements in the plantation soil are closely correlated to the efficiency of P element, and the soil Mn has greater fixation effect on P under the condition of reduction. Si can benefit the release of P in soil, and proper Ca content can also increase the activity of P element. (3) The activation agents tested can not only promote the release of hard soluble P, but also control the release of water soluble P so as to stabilize the P supply from soil. (4) In the basalt latolol soil eucalypt system, the promotion and control mechanism of activation agents to P is to adjust the contents of Fe, Mn and Al in soil so as to realize the activation of P.