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加勒比松凋落物对土壤性状的影响

Keywords: 加勒比松,土壤物理性质,养分,微生物,酶活性

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Abstract:

加勒比松(Pinus caribaea Morelet)生长快、适应性强、耐瘠薄土壤,是南亚热带低海拔丘陵地区造林绿化的主要树种之一[1].由于纯松林结构简单、生态效益差[2],在纯松林下套种阔叶树进行改造,可以建成针阔混交林,为修复脆弱的生态系统提供了一条有效途径.土壤影响着林木的生长,土壤理化性质是土壤质量的重要指标[3-4],土壤微生物和酶在分解凋落物及土壤的生化循环中起重要作用[5-6],影响植物养分的吸收[7-10],二者越来越多地被用做土壤肥力的一个指标[6,11].由于土壤的物理、化学和生物性质相互作用,土壤质量应该结合物理的、化学的和生物的因子进行评价[12].森林凋落物是林地养分的主要来源,可以改变森林土壤的理化性质,并对土壤微生物产生影响.

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