亚热带草地生态系统中植物多样性与AM真菌互作的研究

Study on the interaction between plant diversity and AM fungi in subtropical grassland ecosystem

为了揭示草地生态系统中植物多样性与AM真菌的相互关系,对三块亚热带草地生态系统中植被和AM真菌的多样性进行了调查.结果表明,不同草地的AM真菌多样性没有差异,而植被多样性存在显著差异,植被Shannon-Weiner多样性指数分别为0 4 6 0、0 6 14和1 70 3.三块草地的AM真菌孢子密度分别是4 7、2 1和5 2g-1,表明土壤中AM真菌孢子密度高的草地,其植被多样性指数也高.植被的多样性指数与孢子密度的相关系数为0 6 5 8(P <0 0 1) ,植被的物种丰度与孢子密度的相关系数为0 5 4 3(P <0 0 5 ) .该研究表明。

In order to reveal the relationship between plant diversity and AM fungi, the diversities of vegetation and AM fungi in three subtropical grassland ecosystems were investigated. Results indicated that there was no significant difference between AM fungi diversities of three grasslands, but significant difference was observed between plant diversities, with the Shannon-Weiner diversity indexes of 0.460, 0.614 and 1.703, respectively. The spore densities of three grasslands were 4.7, 2.1 and 5.2 g^(-1), respectively. This indicated that plant diversity was higher in the grassland with higher AM fungal spore density. The coefficient between plant diversity and spore density was 0.658(P<0.01), and that between plant species richness and spore density was 0.543(P<0.05). The present research showed that spore density is one important AM fungal factor influencing plant diversity