Abstract

对中国亚热带树种杉木(<em>Cunninghamia lanceolata</em>)、香樟(<em>Cinnamomum camphora</em>)、银杏(<em>Ginkgo biloba</em>)3个树种在不同凋落物厚度下凋落物分解速率和分解酶活性进行了探究。利用分解网袋法,根据浙江省的平均酸雨水平,在酸雨(pH4.0)条件下设置了凋落物40g、凋落物20g、凋落物10g 3个梯度。结果表明:凋落物分解速率随厚度的增加呈加快的趋势,杉木凋落物10、20、40g的年分解系数<em>K</em>分别为0.24、0.27、0.34,香樟凋落物10、20、40g的年分解系数<em>K</em>分别为0.25、0.3、0.32,银杏凋落物10、20、40g的年分解系数<em>K</em>分别为0.42、0.5、0.58;脲酶活性表现为:凋落叶40g>凋落叶20g>凋落叶10g,纤维素酶活性表现为:凋落叶40g、凋落叶20g>凋落叶10g,蔗糖酶活性表现为:后期凋落叶40g>凋落叶20g>凋落叶10g,凋落物分解过程是多种酶共同作用的结果。

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