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草业学报  2015 

人工梭梭林对沙地土壤理化性质和微生物的影响

DOI: 10.11686/cyxb20150506, PP. 44-52

Keywords: 土壤微生物,土壤理化性质,沙地,人工梭梭

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Abstract:

选取民勤生长20年的人工梭梭林沙丘和流动沙丘为对象,研究梭梭林发育过程中沙丘土壤理化性质、微生物数量的变化以及二者之间的相关性,旨在探讨人工梭梭林对沙丘土壤形成的影响,为干旱区沙化土地治理提供科学依据。结果表明,营造梭梭林使其林内土壤得到较好的改善。1)土壤粘粒、粉粒和细砂粒含量分别增加71.51%,70.64%,12.09%;有机质、全氮、全磷、全钾、水解氮、速效钾、速效磷和CaCO3含量均增加;2)细菌、放线菌数量分别增加38.43%,32.52%,真菌数量减少75.38%,土壤碱化程度得到缓解;3)在50~100cm土层,梭梭蒸腾消耗使土壤水分含量相对减少;4)土壤微生物和土壤理化性质均具较好的相关性,尤其是真菌和放线菌数量与pH值呈显著的负相关关系(P<0.05),有机质含量与细菌和真菌数量呈显著的正相关关系(P<0.05);土壤微生物数量与土壤粒度大小、土壤含水量之间呈线性关系且不显著(P>0.05)。可见,梭梭林的建立有利于改善土壤物理结构,提高土壤肥力,加快沙地成土进程。

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