阿拉善荒漠5种灌丛下土壤细菌特征

The soil bacterial condition beneath five shrub species in the central Alxa

为了加深对阿拉善荒漠土壤环境状况的了解,并为植被生态功能的评价以及植物群落的保育与恢复提供理论依据,基于16S rDNA高通量测序和相关统计分析方法,对5种荒漠建群灌木红砂(Reaumuria soongarica)、绵刺(Potaninia mongolica)、沙冬青(Ammopiptanthus mongolicus)、霸王(Zygophyllum xanthoxylum)、白刺(Nitraria tangutorum)丛下表层和次表层的土壤细菌进行了研究。结果表明:5种灌丛下的土壤细菌以放线菌门和变形菌门为主,不同土层和灌木间的土壤细菌群落结构、多样性及群落功能均存在差异。土壤细菌群落结构与土壤中Mg2+、全碳和HCO3-含量的相关性更显著。土壤细菌群落结构的差异程度与灌木本身的发生学亲缘关系十分吻合,且表层土壤细菌受植物形态、生理特征以及具体生存策略的影响更大。

In order to deepen the understanding of the soil environment in central Alxa,and provide theoretical basis for the evaluation of vegetation ecological function and the conservation and restoration of plant community,based on 16S rDNA high-throughput sequencing and related statistical analysis methods,the soil bacteria of the surface and subsurface beneath five shrub species(Reaumuria soongarica,Potaninia mongolica,Ammopiptanthus mongolicus,Zygophyllum xanthoxylum and Nitraria tangutoru)were studied.The results showed that Actinobacteria and Proteobacteria were the main soil bacteria under the five shrubs.There were differences in soil bacterial community structure,diversity and community function between different soil layers and shrubs.The content of Mg2+,total carbon and HCO-3 in soil were more associated with soil bacterial community structure.The difference of soil bacterial community structure was consistent with the phylogeny genetic relationship of five shrubs,and the surface soil was more affected by plant morphology,physiological characteristics and specific survival strategies.