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- 2017
模拟冻融对高山土壤微生物数量和活性的影响
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Abstract:
摘要 目的: 全面了解冬季高山土壤循环过程,为全球气候变化下生物种群和分布的变化提供技术支持.方法: 采用室内模拟冻融的方法,研究了不同冻融处理(-2℃,-2~2℃,-20~2℃)对土壤微生物数量和活性的影响.结果: 研究发现,持续的冻结(-2 ℃)降低了土壤细菌数量、微生物总数量和微生物生物量碳氮含量.剧烈的冻融(-20~2 ℃)降低了蔗糖酶活性,而温和的冻融(-2~2 ℃)则增加了细菌数量、微生物总数量和纤维素酶、过氧化氢酶活性.结论: 适当的冻融可以通过改善土壤微生物数量和群落结构,从而对土壤营养物质的转化和植物群落的构建产生实质性的影响.
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