Succession of soil microbial community in a developing mid-channel bar: The role of environmental disturbance and plant community.
Succession of soil microbial community in a developing mid-channel bar: The role of environmental disturbance and plant community.
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发育中的河道中坝土壤微生物群落的演替：环境干扰和植物群落的作用
DOI：
10.3389/fmicb.2022.970529
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发表时间：
2022
影响因子：
5.2
通讯作者：
中科院分区：
文献类型：
--
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微生物和植物群落的演替对土壤生态功能的发展和稳定至关重要。植物群落和环境干扰在新建立的栖息地中形成微生物群落的相对作用尚不清楚。以长江中游江滩为研究对象，探讨了环境干扰梯度和植物群落特征对土壤微生物群落演替的影响。从MCB收集散装和根际土壤，并根据其暴露于环境干扰的水平进行分类：头部，中央和尾部。这些随后进行了高通量测序和域间生态网络（IDEN）分析，以确定和表征在每个干扰水平的土壤中存在的主要微生物类群。此外，在每个站点，还注意到植物群落的存在和分布。本研究表明，无论是散装土壤养分和植物群落表现出显着的空间分布依赖于干扰的水平，这影响了微生物群落的组成。在MCB的侵蚀较少的部分，即，中心，养分积累，促进植物生长。这反过来又促进了更多样化的微生物群落，由细菌属假节杆菌占主导地位。与根际土壤微生物群落相比，植物与非根际土壤微生物群落的关联性更强。特别是，糖花三叶草和牛鞭草，目前在网站的低干扰，表现出更广泛的植物微生物协会。因此，它们在塑造土壤微生物群落方面发挥了关键作用。然而，一般来说，植物物种并不直接决定细菌群落的组成，而是改变土壤的营养状态，以促进微生物的生长。这些发现对于新形成的生态系统的保护实践具有重要价值，这需要综合了解环境干扰和植物对土壤微生物群落组合的作用。
Succession of microbial and plant communities is crucial for the development and the stability of soil ecological functions. The relative role of plant communities and environmental disturbance in shaping the microbial community in a newly established habitat remains unclear. In this study, a mid-channel bar (MCB) exposed to an environmental disturbance gradient in the Yangtze River was studied to explore the effects of such disturbance and plant community traits on the succession of the soil microbial community. Bulk and rhizospheric soils were collected from the MCB and classified according to their level of exposure to environmental disturbance: head, central and tail. These subsequently underwent high-throughput sequencing and interdomain ecological network (IDEN) analysis to identify and characterize the predominant microbial groups present in the soils at each disturbance level. Furthermore, at each site, the presence and distribution of the plant community was also noted. The present study demonstrated that both bulk soil nutrients and plant community exhibited significant spatial distribution dependent on the level of disturbance and this influenced the composition of the microbial community. In less eroded parts of the MCB, i.e., the central, nutrients accumulated, promoting growths of plants. This in turn encouraged a more diverse microbial community, dominated by the bacterial genus Pseudarthrobacter. Plant showed a stronger association with bulk soil microbial communities compared to rhizosphere soil microbial communities. Particularly, Triarrhena sacchariflora and Hemarthria altissima, present in sites of low disturbance, exhibiting a more extensive plant-microbe association. They thus played a key role in shaping the soil microbial community. In general, however, plant species did not directly determine the composition of the bacterial community, but instead altered the nutritive state of the soil to promote microbial growth. Such findings are of significant value for conservation practices of newly formed ecosystems, which requires an integrated understanding of the role of environmental disturbance and plants on soil microbial community assemblage.