摘要
通过长期定位模拟试验结果证明,水旱轮作,尤其冬种油菜对土壤供磷有良好效应。此外,高的地下水位在施用常量绿肥的情况下土壤有效磷的变化也显示出其优越性,分析产生以上变化和差异的主要原因是土壤磷素形态中的Al-P,Fe-P,活性有机磷和中度活性有机磷的含量不同。
The results obtained from a long-term simulating experiment showed that the supply of soil phosphorus was improved significantly by the rotation of rice and land crops,especially the double rice and rape cropping system. The aforementioned result was also abserved in the treatment of higher water table (20 cm)and normal quantity of green manure application. The increase of avai-lable P was mainly caused by the different contents of Al-P, Fe-p and active and mactive organic P, which would change into soil total phosphorus.
关键词
水稻土
耕作制度
地下水位
绿肥
磷
paddy soil
farming system
ground water level
soil organic matter
soil phosphorus
