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《Journal of Beijing Forestry University》 2008-03
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Diversity of soil microbial communities in the mycorrhizosphere of five afforestation tree species in the Loess Plateau.

ZHANG Hai-han~1;TANG Ming~2;CHEN Hui~2;DU Xiao-gang~2.1 College of Life Sciences,Northwest A & F University,Yangling,Shaanxi Province,712100,P.R.China;2 College of Forestry,Northwest A & F University,Yangling,Shaanxi Province,712100,P.R.China.  
The study is conducted to accurately assess the roles of afforestation tree species in ecological rehabilitation of the Loess Plateau.It adopts BIOLOG method to examine the diversities of microbial communities in the mycorrhizospheres of five tree species,Caragana microphylla,Hippophae rhamnoides,Sophora viciifolia,Pinus tabulaeformis,Robinia pseudoacacia.It shows that in different tree species,the average well color development(AWCD) varies in order of Pinus tabulaeformisHippophae rhamnoidesSophora viciifoliaCaragana microphyllaRobinia pseudoacacia.The different tree species differ significantly in both mycorrhizal infection rates and microbial functional diversities.The community richness and diversity indices of mycorrhizosphere microbes indicate that Pinus tabulaeformis presents the highest functional diversity and the richest structural diversity,followed by Hippophae rhamnoides and Caragana microphylla.The carbon sources related to principal component 1 and 2 are carboxylic acids,amino acids and carbohydrates.Correlation analysis indicates that the mycorrhizal infection rates appear significant positive correlation with the functional diversities of soil microbes,and the higher the mycorrhizal infection rates,the higher the functional diversities.The ectomycorrhizal tree species are beneficial to improving microbial community structures in degenerated soils of the Loess Plateau,thereby they are able to perform better than tree species of vesicular-arbuscular mycorrhizae.Pinus tabulaeformis as the pioneer tree species for the vegetation rehabilitation in the Loess Plateau is capable of improving the community structures of microbes in dry and barren soils.
【Fund】: 国家自然科学基金项目(30225035);; 国家自然科学基金重点项目(30630054);; “十一五”国家科技支撑计划项目(2006BAD08A1202);; 长江学者和创新团队发展计划(IRT0748)
【CateGory Index】: S714
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