荒漠草原土壤酶与土壤养分的动态研究

研究了内蒙古荒漠草原不同利用强度单元内土壤养分以及5种酶活性,并对土壤酶活性与土壤养分含量之间的相关性进行了分析。结果表明,草原的利用强度直接影响着草地的土壤养分状况和酶活性,轻度利用有利于土壤中5种酶活性的增加,重度利用则导致土壤转化酶和蛋白酶活性显著降低。轻度利用增加了土壤中有机质、全氮和全磷的含量,重度利用则导致土壤有机质、全磷、全氮和全钾含量降低。脲酶和多酚氧化酶的活性在年季内变化幅度较大。相关性分析表明,蛋白酶与各养分之间的相关性最大。

Research on dynamic of soil enzyme activities and soil nutrients in desert steppe

In this paper we studied soil nutrients and 5 kinds of enzyme activities in different using intensity units in Inner Mongolia desert grassland, and analyzed the correlations among them. The results showed that using intensity directly affected soil nutrient contents and enzyme activities in desert steppe. Light using activity increased the activities of enzymes and the contents of soil organic matter, total nitrogen and total phosphorus, but heavy using one decreased significantly the activities of catalase and protease activities and the contents of soil organic matter, total phosphorus, total nitrogen and potassium. The activities of urease and polyphenol oxidase varied more in annual quarter. Correlation analysis showed the highest correlation occurred between protease activity and nutrient contents.