短脚锦鸡儿灌丛对植物群落和土壤微生物群落的促进效应研究

The positive effect of Caragana breviflora shrubs on plant communities and soil microbial communities in the Inner Mongolia desert region

以内蒙古荒漠区短脚锦鸡儿灌木为研究对象,采用野外调查法分析灌丛对植物群落的影响,采用传统培养法,结合分子鉴定法分析灌丛对土壤微生物群落的影响。结果表明:(1)灌丛内植物群落多度和总生物量显著大于灌丛外,但是物种丰度和Shannon-Wiener指数灌丛内外无显著差异;(2)随土壤深度的增加,表层土与深层土的土壤可培养细菌丰度和真菌多度差异不显著,其余土壤微生物群落多样性特征均表现为:表层土显著大于深层土;(3)灌丛对土壤微生物群落具有正效应,且表层土正效应最大;(4)灌丛对植物群落的促进作用大于对土壤微生物群落的作用。

In this study,we used Caragana breviflora in the Inner Mongolia desert area as target shrubs and field investigation methods to evaluate the effect of shrubs on plant communities,while also using a combination of traditional cultivation methods and molecular biology technology to evaluate the effects of shrubs on soil microbial communities.The findings revealed that:(1)Both the abundance and biomass of herbaceous plants were significantly greater under C.breviflora shrub canopies than in open areas,whereas there was no significant difference in the richness and Shannon-Wiener diversity index between shrub canopies and open areas;(2)The richness,abundance,and Shannon-Wiener index of soil culturable bacteria,fungi,and actinomycetes tended to be highest at either the top or subsurface soil layers;(3)C.breviflora shrubs had positive effects on soil microbial communities,and these positive effects were the highest at the top soil layer;(4)C.breviflora shrubs had more positive effects on plant communities than on soil microbial communities.