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采用Hedley修正体系分级法对轮作30年的长期定位土壤进行测定,结果表明,不同施肥条件下各形态磷的基本表现为:有机肥区>化肥区>CK,而有机肥和化肥配施能明显增加土壤中各形态磷的含量,从而有效的扩大了土壤磷库。从30年轮作的动态变化来看,CK和单施氮肥处理的NaHCO3-P和NaOH-P含量的变化幅度不大;施磷化肥区NaHCO3-P和NaOH-P的含量随着种植年限的增加而缓慢的上升;有机肥区的NaHCO3-Pi和NaOH-Pi含量不断增加,而NaHCO3-Po和NaOH-Po的含量呈先升高再降低再显著升高的动态变化趋势。棕壤中无机磷主要以NaOH-Pi和HCl-Pi的形态存在,有机磷主要以NaOH-Po的形态存在;不同施肥对NaHCO3-Pi和Res-P所占总浸提磷比例影响较大,施入磷肥和有机肥能提高土壤中NaH-CO3-P的比例;有机肥能促进Res-P的转化并减少Res-P的固定,从而降低了Res-P在土壤中的比例。
Hedley correction system grading method was used to measure the long-term positioning of the soil for 30 years. The results showed that the basic forms of phosphorus in different fertilization conditions were: organic fertilizer area> chemical fertilizer area> CK, while the application of organic manure and chemical fertilizer was obvious Increase the content of various forms of phosphorus in the soil, thus effectively expanding the soil phosphorus pool. According to the dynamic changes of crop rotation in 30 years, the content of NaHCO3-P and NaOH-P in CK and N-fertilizer treatments did not change much. The contents of NaHCO3-P and NaOH-P in the areas with phosphate fertilizer increased with planting years While the content of NaHCO3-Pi and NaOH-Pi in the organic fertilizer area increased continuously, while the content of NaHCO3-Po and NaOH-Po increased first and then decreased significantly again. The inorganic phosphorus in brown soil mainly existed in the form of NaOH-Pi and HCl-Pi, while the organic phosphorus mainly existed in the form of NaOH-Po. Different fertilization had a significant effect on the total phosphorus uptake by NaHCO3-Pi and Res-P, Application of phosphate and organic fertilizers can increase the ratio of NaH-CO3-P in the soil. Organic manure can promote the transformation of Res-P and reduce the immobilization of Res-P, thus reducing the proportion of Res-P in the soil.