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微生物可凝聚土壤颗粒形成生物土壤结皮(BSCs),其在荒漠化土壤植被恢复具有举足轻重的作用。通过构建环境样品16S rDNA文库,本文分析了浑善达克沙地生物土壤结皮(BSCs)细菌群落组成特征及其与结皮形成演替的关系。结果表明:浑善达克沙地BSCs中细菌主要类群为α-和γ-变形杆菌。其中,优势菌是γ-变形杆菌门中的假单胞菌科(Pseudomonadaceae),不动杆菌属(Acinetobacter)和α-变形菌门中的鞘氨醇单胞菌属(Sphingomonas),分别占到总细菌数14.5%,18.2%和12.7%。而Cyanobacteria类群很少,仅占全部克隆的1.8%,这使其细菌群落组成特征明显不同于成熟BSCs。因此,在BSCs早期发育或重建早期时期,起先锋拓殖作用的可能是Cyanobacteria之外的其他异养和自养细菌。
Microbial organisms can aggregate soil particles to form biological soil crusts (BSCs), which play a decisive role in the restoration of desertified soil vegetation. By constructing an environmental sample 16S rDNA library, this paper analyzed the composition of bacterial community and its relationship with the succession of crust formation in biological soil crusts (BSCs) in Hunshandake Sandy Land. The results showed that the main bacterial groups of BSCs in Hunshandake sandy land were α- and γ-Proteus. Among them, the predominant bacteria were Pseudomonadaceae, Acinetobacter and Sphingomonas in the α-Proteobacteria in the γ-Proteobacteria, accounting for The total bacteria count was 14.5%, 18.2% and 12.7%. However, the Cyanobacteria group is rare, accounting for only 1.8% of the total clones, which makes the composition of bacterial community significantly different from that of mature BSCs. Therefore, in the early stages of BSCs early development or reconstruction, pioneering colonization may be other than Cyanobacteria heterotrophic and autotrophic bacteria.