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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**)。
Taking 19 years of long-term fertilization experiment in vegetable reserve as tested soil, the soil was divided into different size organic-inorganic composites by ultrasonic dispersion technology to study the effect of long-term fertilization on the variation of phosphorus content in soil organic-inorganic complex. The results showed that the combination of long-term application of organic manure and organic manure and phosphate fertilizer reduced the <10μm complexes and transformed them into larger particle size complexes. The contents of total phosphorus, organic phosphorus and available phosphorus in the fractions with different fractions were the highest in the range of <2μm, and decreased with the increase of the particle size. Compared with the control, different fertilization can increase the content of phosphorus in each particle size complex. Among them, the combination of organic manure and phosphate fertilizer to deal with each particle size complex the largest increase in phosphorus content. Correlation analysis showed that organic phosphorus and available phosphorus all had a significant positive correlation with total phosphorus (r = 0.9180 **, r = 0.9621 **).