中文摘要：

蔬菜保护地土壤富磷现象相当严重，因此，了解保护地土壤磷素形态特征对合理施肥及保护环境具有十分重要的意义。本文利用修正的Hedley土壤磷素分级方法，研究了长期定位施肥条件下蔬菜保护地不同施肥处理间土壤磷素形态变化。分别对土壤中的无机磷、有机磷、残余态磷以及各形态磷在全磷中所占的比重进行了分析。结果表明，不同施肥处理土壤之间磷素形态差异较大，除残余态磷，均表现为施有机肥处理高于不施有机肥处理，氮磷钾肥配施处理高于肥料单施处理。土壤磷主要以无机磷形式存在，其中以HC1-P所占比重最大，平均含量达754．04mg·kg^-1，占全磷40％左右。在长期定位施肥条件下，蔬菜保护地土壤中的磷对环境的污染潜力不容忽视。

英文摘要：

The phenomenon of rich phosphorus in vegetable soil is quite serious. Therefore, it is very essential for proper fertilization and protecting invirenment to understand soil phosphorus fractions. In different fertilization treatments of estab-lishment soil under long - term located using fertilization, soil P fractions were determined by a modified Hedley fraction method. In this paper, the inorganic phosphorus, organic phosphorus, residual phosphorus and the percentage of different fraction of phosphorus to the total phosphorus were analysed. The result showed that the contents of P of different fraction were obviously different in different fertilization treatments. It mainly showed that the content of P in the treatments of using organic fertilization was higher than in the ones of inorganic fertilization, the content of P using conbined fertilization was higher than using fertilization alone except the content of residual P. The phosphorus of soils existed in the form of inorganic phosphorus. Especially, the HC1 - P was mainest, which of the average content was 754.04 mg·kg^-1, the percentage to the total phosphorus was about 40%. The labile P was the second. Under long - term located using fertilization, the effect of phosphorus of vegetable planted soils in greenhouse to invironment should be regarded.