长期施肥对设施土壤磷素积累及释放的影响

研究了长期定位条件下不同施肥处理对保护地土壤磷素积累及释放的影响。结果表明,施磷肥的土壤其全磷、速效磷和有机磷的含量明显高于不施磷肥的土壤,且在同一条件下,施加有机肥能提高土壤中不同形态磷素的含量。四种处理土壤全磷含量的大小顺序为:AP>BP>A>B,速效磷和有机磷含量的大小顺序为:AP>A>BP>B。有机肥能明显促进土壤磷素的释放,四种处理土壤磷素累积释放量的大小顺序为:AP>BP>A>B。抛物线扩散公式能很好地拟和土壤磷素释放特征。

Effects of Long-term Fertilization on Accumulating and Releasing of Phosphorus in Greenhouse Soil

Effects of long-term fertilization on accumulating and releasing of phosphorus in greenhouse soil was investigated. The results showed: Total phosphorus, rapidly available phosphorus and organic phosphorus in soil fertilized with phosphate fertilizer present the obviously higher content than that in un-fertilized soil. Moreover, the content of phosphorus with different species can be increased by fertilizing organic manure under the same condition. The content of total phosphorus in the four kinds of treatments present the orders: AP>BP>A>B, the orders of rapidly available phosphorus and organic phosphorus are: AP > A > BP > B. The organic manure can stimulate the releasing of soil phosphorus apparently. The orders of accumulating-releasing capacity of soil phosphorus in the four different kinds of soil is: AP>BP>A>B. The releasing characteristic of soil phosphorus can be exactly depicted by parabolic diffusion equation.