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分析了不同利用方式下泉州市土壤磷素吸附-解吸特征。结果表明:Langmuir等温方程式可以很好地表征土壤磷素的吸附特性;旱地和轮作地土壤对磷的吸附能力较强,而草地和林地土壤对磷的吸附能力较弱;磷的流失风险顺序为轮作地>草地>林地>旱地;指导施磷量与吸附常数、最大缓冲量的大小顺序一致,为旱地>轮作地>林地>草地;轮作地和草地的解吸率高于旱地和林地,土壤的缓冲能力顺序为旱地>林地>轮作地>草地。主成分分析表明,平均解吸率、易解吸磷、磷吸附指数和磷零吸持平衡浓度4个指标最能反映土壤磷素流失潜力,可作为评价流失潜力的主要指标。
The characteristics of soil phosphorus adsorption-desorption under different utilization patterns in Quanzhou were analyzed. The results showed that the Langmuir isotherm equation can well characterize the adsorption characteristics of soil phosphorus; the adsorption capacity of phosphorus in dryland and crop rotation soil is stronger, while that in grassland and forest soil is weaker; the risk of phosphorus loss is Rotation> grassland> woodland> dryland. The amount of phosphorus application and adsorption constant, the order of the maximum buffer amount are the order of dry land> rotation land> woodland> grassland; the desorption rate of rotation land and grassland is higher than that of dry land and woodland, soil The order of buffer capacity is dry land> woodland> rotation land> grassland. The principal component analysis showed that the four indicators of average desorption rate, easily desorbed phosphorus, phosphorus adsorption index and phosphorus zero adsorption equilibrium concentration can best reflect the potential loss of phosphorus in soil, which can be used as the main index to evaluate the potential for desquamation.