Tillage homogenizes soil bacterial communities in microaggregate fractions by facilitating dispersal
Tillage homogenizes soil bacterial communities in microaggregate fractions by facilitating dispersal
复制标题
耕作通过促进分散使微团聚体部分中的土壤细菌群落均质化
DOI：
10.1016/j.soilbio.2023.109181
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发表时间：
2023
影响因子：
9.7
通讯作者：
Whitman, Thea
中科院分区：
文献类型：
--
作者：
West, Jaimie R.;Lauer, Joseph G.;Whitman, Thea
土壤团聚体通过微团聚体的形成和有机-无机结合，对土壤有机质起到物理保护作用，促进土壤碳的持久性。耕作是一种普遍存在的干扰耕地土壤，破坏聚集，从而影响微生物资源的可用性，土壤微生境条件和微生物的相互作用。我们研究了耕作如何影响土壤微团聚体组分（53-250 μm）的细菌群落组成，特别是散装土壤中的游离微团聚体组分和大团聚体中的封闭微团聚体组分，在美国威斯康星州南部进行了两个长期耕作与免耕实验，代表两种不同的粉壤土（淋溶土和软土）。我们应用16 S rRNA基因扩增子测序，以表征耕作对微团聚体细菌群落的影响，通过将组成变化和生态群落组装模式与各种耕作驱动的土壤环境变化（包括团聚体粒度分布和碳含量）联系起来。耕作均质化土壤细菌群落，定量增加的组成相似性，在两个内情节和情节之间的尺度，和社区组装越来越多的影响，随着耕作的分散。我们没有确定的自由和闭塞的微团聚体组分的细菌群落之间的主要区别，从而突出了土壤微团聚体如何容易转移这些操作定义的部分在温带一年生种植系统，土壤环境受到剧烈的季节性变化，加剧了耕作。通过识别有影响力的社区组装过程和分析社区的微团聚体部分，我们提高了我们的理解的微生物对土壤扰动的反应，从而通过干扰，如耕作影响土壤碳持久性的潜在机制。
Soil aggregation physically protects soil organic matter and promotes soil carbon persistence through microaggregate formation and organo-mineral associations. Tillage is a ubiquitous disturbance to arable soil that disrupts aggregation, thus affecting microbial resource availability, soil microhabitat conditions, and microbial interactions. We investigated how tillage affects bacterial community composition of soil microaggregate fractions (53–250 μm), specifically the free microaggregate fraction in bulk soil and the occluded microaggregate fraction within macroaggregates, using two long-term tillage vs. no-tillage experiments in southern WI, U.S., that represent two different silt loam soils (Alfisol and Mollisol). We applied 16 S rRNA gene amplicon sequencing to characterize the effects of tillage on microaggregate bacterial communities by relating compositional changes and ecological community assembly patterns to various tillage-driven changes in the soil environment, including aggregate size distribution and carbon content. Tillage homogenized soil bacterial communities, as quantified by increased compositional similarity at both within-plot and between-plot scales, and community assembly was increasingly influenced by homogenizing dispersal with tillage. We did not identify major distinctions between bacterial communities of the free and occluded microaggregate fractions, thus highlighting how soil microaggregates readily shift between these operationally defined fractions in temperate annual cropping systems, where the soil environment is subject to drastic seasonal changes that are exacerbated by tillage. By identifying influential community assembly processes and analyzing communities in microaggregate fractions, we improve our understanding of the microbial response to soil disturbance, and thus the potential mechanisms through which disturbances like tillage affect soil carbon persistence.
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DOI：
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发表时间：
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期刊：
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