三江源区不同建植年限对人工草地土壤微生物功能多样性的影响
发布时间：2019-06-27 07:33
【摘要】：明确三江源区不同建植年限人工草地土壤微生物功能多样性的变化规律,探索高寒地区人工草地恢复措施,可以为退化高寒草甸恢复治理提供理论依据。试验于2014年8月在青海省果洛州选择建植4年、8年和12年的多年生禾本科人工草地为试验样地,利用常规实验室分析和Biolog-ECO生态板法对土壤养分和土壤微生物功能多样性进行分析。结果表明:在0~10 cm土层,土壤pH与TN含量在建植4年显著高于其他建植年限;TK和速效养分含量随建植年限增加而升高;在10~20 cm土层,土壤pH在建植4年显著大于其他年限;TK含量在建植12年时显著小于其他年限,AN和AK则呈现建植8年12年4年;AWCD值在0~10 cm土层表现为建植8年12年4年,而在10~20 cm土层随建植年限的增加而增加;在0~10 cm土层,Shannon指数和Pielou指数均是建植12年显著小于建植4年和8年;在10~20 cm土层,Mc Intosh指数表现出建植12年8年4年,且差异显著,而Shannon指数和Pielou指数则表现出建植4年显著小于8年和12年。主成分分析表明,氨基酸类和酯类是土壤微生物利用的主要碳源类型。冗余分析表明,有机碳、速效钾、速效氮、全钾和pH是影响不同建植年限人工草地土壤微生物功能多样性和代谢活性的主要因子。不同建植年限人工草地土壤微生物功能多样性存在差异,随着建植年限的增加,土壤养分状况、微生物群落稳定性和生态环境得到改善。
[Abstract]:To clarify the variation of soil microbial function diversity of artificial grassland in different planting years in the source area of Sanjiang River, and to explore the restoration measures of artificial grassland in alpine region can provide theoretical basis for the restoration and control of degraded alpine meadow. In August 2014, the artificial grassland of gramineae, which was planted for 4 years, 8 years and 12 years in Guoluo Prefecture, Qinghai Province, was selected as the experimental sample plot. The soil nutrients and soil microbial functional diversity were analyzed by conventional laboratory analysis and Biolog-ECO ecological plate method. The results showed that the contents of pH and TN in 0 脳 10 cm soil layer were significantly higher than those in other planting years, the contents of TK and available nutrients increased with the increase of planting years, in 10 脳 20 cm soil layer, the contents of soil pH in 4 years were significantly higher than those in other years, the contents of TK in 12 years were significantly lower than those in other years, while AN and AK showed 12 years and 4 years of planting. The AWCD value in 0 鈮，
本文编号：2506610
[Abstract]:To clarify the variation of soil microbial function diversity of artificial grassland in different planting years in the source area of Sanjiang River, and to explore the restoration measures of artificial grassland in alpine region can provide theoretical basis for the restoration and control of degraded alpine meadow. In August 2014, the artificial grassland of gramineae, which was planted for 4 years, 8 years and 12 years in Guoluo Prefecture, Qinghai Province, was selected as the experimental sample plot. The soil nutrients and soil microbial functional diversity were analyzed by conventional laboratory analysis and Biolog-ECO ecological plate method. The results showed that the contents of pH and TN in 0 脳 10 cm soil layer were significantly higher than those in other planting years, the contents of TK and available nutrients increased with the increase of planting years, in 10 脳 20 cm soil layer, the contents of soil pH in 4 years were significantly higher than those in other years, the contents of TK in 12 years were significantly lower than those in other years, while AN and AK showed 12 years and 4 years of planting. The AWCD value in 0 鈮，
本文编号：2506610
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