<正>在半干旱典型区域选择了8十不同植物群落样地对4粪土壤酶活性及与土壤理化性质、微生物量的关系进行研究。结果表明。各种酶活性受制于水分、盐碱等因素。分量均较低。大多数酶在同一样地各个剖面中变化趋势一致。相关分析表明。影响各种酶活性的土壤物理、化学、生物性状有一定的差异-其中大多与有机质含量、微生物含量有非常密切的关系。用土壤化学性质对各种酶活性进行逐步回归分析,可以得到理想的方程。主成分分析发现。微生物量和中性磷酸酶在备主成/寸中均有较大的相关系数,可认为是该地区有代表性的土壤生物特性因子。另外，对土壤表层酶活性和微生物量进行聚类分析，可以将8个样地分为不同的类别。

Ecological public welfare forest construction is an effective mean to improve sustainable forest management. This paper analyzed the effects of ecological public welfare construction on the quantity, quality and structure of forest resource, based on the survey data in Lin’an. The results show that ecological public welfare construction will play a positive role in improving sustainable management, if farmer’s income mainly comes from non-agriculture sector or non-wood forest products. Increasing the compensation standard is not the necessary condition to improve ecological public welfare forest sustainable management.