土地利用方式对酸性红壤丛枝菌根真菌群落的影响

Effects of Land-use Patterns on Arbuscular Mycorrhizal Fungi Community in Acidic Red Soil

为了研究土地利用方式对酸性红壤丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)群落的影响,调查了酸性红壤4种土地利用方式(草地、玉米、花生和大豆)下非根际和根际土壤AMF群落多样性和组成结构。结果表明:土地利用方式显著影响了AMF群落优势属球囊霉属(Glomus)和巨孢囊霉属(Paraglomus)的相对丰度,但是根际作用影响不明显。土地利用方式而非根际作用显著影响了AMF群落香农指数和物种丰富度,其中大豆地表现出最低的香农指数和物种丰富度。土地利用方式和根际作用都显著影响AMF群落组成结构,但是土地利用方式的作用强度明显高于根际作用。球囊霉属主要解释了不同土地利用方式之间的AMF群落组成差异。土壤pH是影响土壤AMF群落结构的最关键因子。因此,土地利用方式比根际作用表现出对酸性红壤AMF群落更大的影响,展现了土地利用变化在影响土壤AMF群落方面的重要作用。

In order to investigate the effect of land-use pattern on arbuscular mycorrhizal fungi(AMF)community in acidic red soil,the diversity and composition of AMF communities in the bulk and rhizosphere soils under four land-use patterns(natural vegetation,maize,peanut and soybean)were investigated.The results show that Glomus and Paraglomus are the two genera with the highest relative abundances in the AMF community in acidic soil.Land-use pattern significantly affects their relative abundances,but the effect of rhizosphere is not significant.The Shannon index and species richness of AMF community are significantly affected by land-use pattern rather than rhizosphere effect.Among the four land-use patterns,soybean field shows the lowest Shannon index and species richness.Non-metric multi-dimensional scale(NMDS)and permutation multivariate variance analysis(PERMANOVA)show that both land-use pattern and rhizosphere effect significantly affect AMF community composition,and the effect intensity of land-use pattern is significantly higher than that of rhizosphere effect.Similarity percentage(SIMPER)shows that the genus Glomus mainly explains the differences in AMF community compositions among different land-use patterns.Soil pH is the most important factor affecting soil AMF community structure.Therefore,land-use pattern has a greater effect on AMF community than rhizosphere effect in acidic red soil,demonstrating the important role of land-use change in influencing soil AMF community.