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OALib Journal期刊
ISSN: 2333-9721
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空心莲子草入侵对土壤am真菌生物量和群落结构的影响――以湖北省典型区域为例
DOI: 10.3724/SP.J.1145.2013.00105, PP. 105-112
Keywords: 空心莲子草,丛枝菌根真菌,fames,dgge,群落结构,马尼拉草坪,系统发育树
Abstract:
土壤丛枝菌根（arbuscularmycorrhizal，am）真菌具有维持植被稳定性和多样性的重要作用.为了解空心莲子草入侵过程中与am真菌的相互作用，采用脂肪酸甲酯（fames）和基于18srdna的pcr－dgge方法对湖北咸宁、仙桃和武汉三地空心莲子草（alternantheraphiloxeroides）入侵前后土壤am真菌的生物量和群落结构进行了比较分析.结果发现，基于fames表征的am真菌生物量在空心莲子草入侵后变化不大，仅仙桃地区显著增加（p<0.05）.尽管dgge图谱显示咸宁、仙桃和武汉三地am真菌优势类群的群落结构均发生了明显演替，但群落间物种组成差异的多样性指数βwh在2.55-2.73之间、群落多样性指数h′在1.22-1.38之间，变化均不大.结果表明，空心莲子草入侵所形成的植物更替明显改变了am真菌优势类群的结构，但对am真菌的生物量和多样性影响很小.
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