Multiple anthropogenic environmental stressors structure soil bacterial diversity and community network

IF 9.8 1区 农林科学 Q1 SOIL SCIENCE Soil Biology & Biochemistry Pub Date : 2024-08-23 DOI:10.1016/j.soilbio.2024.109560
Mochen Wu, Siyuan Xie, Jingxi Zang, Yuanze Sun, Shimeng Xu, Si Li, Jie Wang
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Abstract

Microbial communities in many ecosystems are suffering a wide range of environmental stressors induced by anthropogenic perturbations. While the impacts of a single stressor have been extensively estimated in numerous studies, the responses of microbial communities to multiple environmental stressors simultaneously are still poorly understood. In the current study, we investigated the taxonomic diversity, community resistance, and co-occurrence interaction of soil bacterial communities treated with different numbers of environmental stressors by conducting 136 microcosms. We found that the richness and Shannon diversity of the soil community decreased significantly from 1430 to 6.54 in the mono-factor treatments to 920 and 5.77 in the hepta-factor treatments. The counts of nodes and edges of the soil microbial networks decreased with the increasing stressor number, potentially indicating that multiple stressors can reduce the network size. Multiple stressors increased the community resistance potential to environmental disturbance. Additionally, the network cohesion suggested that the cooperative and competitive behaviors between microorganisms were induced by multiple stressors. The observation could be potentially due to the enrichment of the generalists by multiple environmental stressors. Although only a handful of stressors were included, our study still indicated that multiple environmental stressors would lead to diversity loss via deterministic processes.

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多种人为环境压力因素对土壤细菌多样性和群落网络结构的影响
许多生态系统中的微生物群落正遭受着人为干扰引起的各种环境压力。虽然许多研究已经广泛估计了单一压力源的影响,但对微生物群落同时面对多种环境压力源的反应仍然知之甚少。在本研究中,我们通过 136 个微生态系统,研究了在不同数量的环境胁迫下土壤细菌群落的分类多样性、群落抵抗力和共生相互作用。我们发现,土壤群落的丰富度和香农多样性从单因子处理的 1430 和 6.54 显著下降到七因子处理的 920 和 5.77。土壤微生物网络的节点和边缘计数随着胁迫因子的增加而减少,这可能表明多重胁迫因子会缩小网络的规模。多重压力增加了群落抵抗环境干扰的潜力。此外,网络凝聚力表明,多种胁迫会诱发微生物之间的合作和竞争行为。这一观察结果可能是由于多种环境应激源丰富了普通微生物。虽然只包含了少数几种压力因素,但我们的研究仍然表明,多种环境压力因素会通过确定性过程导致多样性丧失。
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来源期刊
Soil Biology & Biochemistry
Soil Biology & Biochemistry 农林科学-土壤科学
CiteScore
16.90
自引率
9.30%
发文量
312
审稿时长
49 days
期刊介绍: Soil Biology & Biochemistry publishes original research articles of international significance focusing on biological processes in soil and their applications to soil and environmental quality. Major topics include the ecology and biochemical processes of soil organisms, their effects on the environment, and interactions with plants. The journal also welcomes state-of-the-art reviews and discussions on contemporary research in soil biology and biochemistry.
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