不同施肥对蔬菜保护地土壤有机无机复合体中磷素状况的影响

以19年蔬菜保护地长期定位施肥试验土壤为材料,借助超声波分散技术将土壤分为不同粒级的有机无机复合体,研究长期不同施肥处理对土壤有机无机复合体磷素含量变化的影响。结果表明,长期施用有机肥及有机肥与磷肥配施使<10μm的复合体减少,并向较大粒级复合体转化。不同粒级复合体中的全磷、有机磷与速效磷含量在<2μm粒级最高,并随粒径增大呈下降趋势。与对照相比,不同施肥可以提高各粒级复合体中磷的含量。其中,有机肥与磷肥配施处理各粒级复合体中磷素含量增幅最大。相关分析表明,土壤各粒级复合体中有机磷和速效磷均与全磷呈极显著正相关(r=0.9180**,r=0.9621**)。

Effect of Different Fertilizations on the Status of P in Organo-mineral Complexes of Vegetable Soils in Greenhouse

A long-term field experiment of vegetable soils in greenhouse has been carried out for 19 years in Shenyang. The soils were separated by ultrasonic dispersion. The results showed that the distribution of soil particle-sizes was changed, Long-term application of organic manure, or combined application both inorganic fertilizer and organic manure could decrease the proportion of <10μm particle-size. The contents of total P,Olsen-P and Organic P of <2μm were the most in different particle-sizes. With the increase of particle sizes, the contents of total P decreased. Different application of fertilizer could increase the contents of P in particle sizes contrast to CK. Correlation analysis implies, there are obvious positive correlation between the organic P、Olsen-P and Total P (r= 0.9180**,r= 0.9621**)