不同土壤供磷特性的连续提取动力学分析法的建立

本文建立了土壤供磷特性连续提取动力学分析的原理和方法，并用该方法研究了３种不同土壤供磷特性的差异，并且与饱和吸附法作了比较。结果表明：（１）扬州砂壤土、浙江丽水黄壤和江西红壤土壤有效磷的供应容量、吸附态和弱固定态磷的溶解度、有效磷的供应速度或负向缓冲能力和磷的供应强度均为：扬州砂壤＞浙江丽水黄壤＞江西红壤。（２）不同土壤对水溶性磷的固定能力为：江西红壤＞浙江丽水黄壤＞扬州砂壤土

THE ESTABLISHMENT OF THE CONTINUATIVE EXTRACTION KINETIC ANALYSIS ON P SUPPLYING CHARACTERISTICS OF DIFFERENT SOILS

In this paper, the continuative extraction method and principle for the kinetic analysis of P supplying characteristics of different soil were established. The differences of P supplying characteristics of three different soils were investigated by using the method, and the P adsorption maxima of the three soils were determined by using langmuir equation the results showed: the order of the capacity of available P, the dissolvability of adsorbed and fixed P, the supplying velocity of available P and the supplying intensity of available P of the three soils were as follows: Yangzhou Sandy loam>Zhejiang Lishuy yellow soil>Jiangxi red soil. But the order of the fixation ability to water Soluble P of the three soils was as follows: Jiangxi red soil>Zhejiang Lishuy yellow soil>Yangzhou Sandy Loam.