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Influence of Bacterial Quantitiy in Mycorrhizosphere on Species Diversity of Arbuscular Mycorrhizal Fungi in an Alpine Grassland on the Tibetan Plateau
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- Author:
- No author available
- Journal Title:
- Chinese Journal of Applied & Environmental Biology
- Issue:
- 4
- DOI:
- No doi available
- Key Word:
- 菌根围;细菌数量;AMF;物种多样性;西藏高寒草原
Abstract： 基于从枝菌根真菌(Arbuscular mycorrhizas fungi,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、Acaulospor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.
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