长期不同肥料配施对设施土壤Hedly无机磷形态组成的影响

Composition of Hedly Inorganic Phosphorus in the Greenhouse Soil with Long-term Fertilization

以设施蔬菜长期定位施肥试验土壤为研究对象,采用修正的Hedly磷素形态分级方法,探讨设施土壤不同肥料配施条件下,Hedly无机磷形态变化特征及其与氮钾养分之间的作用关系。结果表明:氮肥的施用能够在一定程度上降低设施土壤中活性无机磷和稳定性无机磷的含量,其中H2O-P对氮肥施用的响应程度最为明显,而对土壤中等活性无机磷(NaOH-Pi)含量有一定的提高作用。钾肥在与磷肥配施过程中对各个形态无机磷含量均有较大程度提高,但是在单独施用和与氮肥配施过程中对无机磷含量影响不大。可见,在设施栽培条件下土壤磷素形态组成发生了较大的变化,管理过程中磷肥要注意适当配合钾肥的施用,才能有效提高磷肥的利用效率。

Abstract： To investigate long-term located fertilization soil in vegetable greenhouse, a modified Hedley inorganic phosphorus （P） fraetionation method was used under different fertilizations in greenhouse soils to investigate the relations of Hedley inorganic phosphorus and soil nutrient. The results showed that N-fertilizer could reduce the content of activated inorganic phosphorus and steady inorganic phosphorus. H20-P was the most sensitivly for the N. N long-term fertilization could increase the content of NaOH-Pi. K and P could increase the content of inorganic phosphorus, which showed that under the condition of greenhouse, the change of the constitute of inorganic phosphorus have taken place. P used together K is the effective measure to raise the utilization rate of P in vegetable greenhouse.