【摘要】 土壤无机磷是生态系统中磷素的重要组成部分,而冻融作用是土壤无机磷赋存形态与转化的重要影响因素。本研究以黑土为试验土壤,在室内模拟冻融环境,研究冻融前后黑土无机磷各组分含量变化及其有效性。结果表明:冻融后无机磷各组分绝对含量总体呈现增加的趋势;冻融前后相对含量没有表现出明显差异,均呈现出O-P>Fe-P>Al-P>Ca-P;相关分析和通径分析结果显示,Al-P、Fe-P为有效磷源,并且直接影响有效磷含量,而O-P、Ca-P与Al-P有较大的通径链系数,即O-P、Ca-P通过Al-P间接影响有效磷含量;冻融循环条件下Olsen-P(Y)与有效磷源Al-P(X1)、Fe-P(X2)间呈线性关系。更多还原

【Abstract】 The freezing and thawing action is an important factor affecting the form and transformation of soil inorganic phosphorus, which is an essential element of ecosystem. In order to examine the changes of inorganic phosphorus fractions and their efficiency under freezing and thawing conditions, a black soil was selected, and the inorganic phosphorus fractions and their efficiency were measured with the method of Chang-Jackson under indoor simulation conditions. The results showed that the absolute contents of inorganic phosphorus fractions increased generally after freezing-thawing, while the relative content of inorganic phosphorus did not change significantly. The contents of inorganic phosphorus fractions followed the order: O-P> Fe-P>Al-P>Ca-P. Correlation analysis and path analysis indicated that Al-P and Fe-P were the available phosphorus source and affected the content of soil available phosphorus directly; while O-P, Ca-P and Al-P had larger coefficient of size chain, indicating that O-P and Ca-P indirectly affect the available phosphorus content through their interactions with Al-P. A good linear relationship was observed between Olsen-P（Y） and Al-P（X₁） and Fe-P（X₂）.更多还原