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OALib Journal期刊
ISSN: 2333-9721
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高寒草原菌根围细菌数量对丛枝菌根真菌物种多样性的影响
DOI: 10.3724/SP.J.1145.2011.00473, PP. 473-479
Keywords: 菌根围,细菌数量,amf,物种多样性,西藏高寒草原
Abstract:
基于丛枝菌根真菌（arbuscularmycorrhizasfungi，amf）孢子形态学鉴定，研究了藏北高寒草原主要建群植物菌根围细菌数量对amf物种多样性的影响.结果表明：1）细菌数量1.02×106~2.96×106、3.01×106~6.06×106个/g范围内，glomus、acaulospora均为优势属，scutellospora则均为最常见属；amf孢子密度、分离频度、相对多度、重要值和种的丰度（sn、sr）均呈glomus＞acaulospora＞scutellospora属的趋势.2）细菌数量较低时（＜3.0×106个/g），amf各属孢子密度、种的丰度（sr）相对较高，shannon-weiner指数、物种均匀度指数亦较高，分别达1.774和0.127.3）不同细菌数量条件下，孢子密度随细菌数量的增加而均呈微弱下降，菌根侵染率、侵染强度、丛枝丰度则均呈不同程度的提高.细菌数量＞3.0×106个/g时，菌根侵染率、侵染强度和丛枝丰度随细菌数量增加而提高的趋势尤为明显.4）不同细菌数量条件下，amf种的构成呈共有种、共有优势种较多（glomus属均占绝对比重），特有种、稀有种较少，以及不同优势种孢子密度、相对多度和重要值差异均较悬殊的分布特征.图6表3参25
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