泰山丛枝菌根真菌群落结构特征

2007年对泰山植被根围内丛枝菌根(arbuscular mycorrhiza,AM)真菌群落组成、数量、分布及其与植物多样性的关系进行了研究。从泰山傲徕峰、黑龙潭库区等样地共分离出4属16种AM真菌:球囊霉属Glomus 9种、无梗囊霉属Acaulospora 4种、巨孢囊霉属Gigaspora 2种和盾巨孢囊霉属Scutellospora1种。其中,球囊霉属Glomus及聚球囊霉Glomus fasciculatum的孢子密度、相对多度、分布频度和重要值均最高,分别为泰山植被区根围内AM真菌优势属和优势种。各样地之间Sorenson相似系数在0.60和0.85之间。植被数量与孢子密度(r=0.80,p0.01)、植物种的丰富度与AM真菌种的丰富度(r=0.77,p0.01)以及与孢子密度(r=0.59,p0.01)均呈极显著正相关关系。研究结果表明植物多样性对于提高AM真菌多样性发挥极为重要的作用。

Arbuscular mycorrhizal fungal community structure in rhizospheric soil of Taishan vegetation

An investigation was carried out to determine the community and distribution of arbuscular mycorrhizal (AM) fungi in the rhizospheric soil of Taishan vegetation in 2007.Sixteen species of AM fungi were isolated,of these 4 belong to Acaulopora,9 to Glomus,2 to Gigaspora and 1 to Scutellospora.Glomus and Glomus fasciculatum showed the highest spore grade,distribution frequency,relative abundance and importance value,being the dominant genus and species in Taishan vegetation,respectively.The Sorenson's similarity coefficients of AM fungal community composition ranged from 0.60 to 0.85.There were significantly positive correlationship between plant quantifies and spore density(r=0.80,p<0.01),plant species richness and AM fungal species richness (r=0.77,p<0.01),and plant species richness and spore density of AM fungi (r=0.59,p<0.01).It suggested that plant species diversity may play key roles in increasing AM fungal diversity.