用通径分析法研究土壤水解酶活性与土壤性质的关系

为正确评价土壤性质对酶活性的影响程度 ,运用通径分析方法研究了浙江 5种土壤 1 2个样品中的土壤脲酶、转化酶、酸性磷酸酶活性与土壤性质的关系。结果表明 :土壤有机质、全氮、全磷是制约脲酶、转化酶和酸性磷酸酶活性的主要因素 ,而阳离子交换量对三种酶活性的影响均很微弱 ;就通径分析的直接效应而言 ,pH对脲酶活性的影响最为显著 ,对转化酶和酸性磷酸酶活性的影响程度大致相当。然而pH对脲酶、转化酶、酸性磷酸酶的这种直接效应在很大程度上被通过其它因素对三种酶的间接效应所抵消 ;土壤粉粒对转化酶活性的作用尤为显著。此外 ,粘粒对酸性磷酸酶、砂粒对脲酶有一定影响且均主要体现为直接效应。

RELATIONSHIP BETWEEN HYDROLASE ACTIVITY IN SOILS AND SOIL PROPERTIES IN ZHEJIANG PROVINCE

In order to assess extents of the influences of soil properties on enzyme activities the relations between activities of urease,invertase and phosphatase and soil properties were studied through path analysis of twelve soil samples of the five major soil types in Zhejiang Province. The results showed that soil organic matter,total nitrogen,and total phosphorus were the major factors influencing activities of urease,invertase and phosphatase, while CEC had the least influence on them. With respect to direct effect in the path analysis, pH value most significantly influenced activities of urease and activities of invertase and phosphatase as well. But the direct effects of pH on the urease, invertase and acid phosphatase were to a large extent counteracted by the indirect effects of other factors on them. Silt also significantly influenced the activities of invertase, whereas clay and sand had certain influence on acid phosphatase and urease, respectively, but mostly in the form of direct effect.