Reshaping of the soil microbiome by the expansion of invasive plants: shifts in structure, diversity, co-occurrence, niche breadth, and assembly processes,Plant and Soil

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Reshaping of the soil microbiome by the expansion of invasive plants: shifts in structure, diversity, co-occurrence, niche breadth, and assembly processes
Plant and Soil ( IF 3.9 ) Pub Date : 2022-05-03 , DOI: 10.1007/s11104-022-05445-x
Changchao Li ₁ , Ruirui Yang ₁ , Shuping Ji ₁ , Lifei Wang ₁ , Jian Liu ₁ , Huaizhi Bo ₂ , Bingzhong Song ₂ , Xiaocui Chen ₃ , Qingqing Cao ₄

Affiliation

Aims

Understanding the ecological impacts of biological invasions is a core issue of invasion ecology. Soil microbiomes control the functioning and health of ecosystems. The aim of this study was to uncover the changes in the soil microbiome caused by invasive plant expansion.

Methods

Taking the typical invasive plant Alternanthera philoxeroides as an example, the structure, diversity, co-occurrence patterns, habitat niche breadth, and assembly processes of the microbiome in invasion-present and invasion-absent soils were analyzed based on high-throughput sequencing.

Results

The invasion altered the structure and composition of the soil microbiome significantly. A group of biomarkers was established using the random-forest machine-learning model to best represent the differences in the microbiome between the invasion-present and invasion-absent soils. The plant invasion decreased the beta-diversity of the soil microbiome but increased the alpha-diversity. Compared with the invasion-absent soils, the invasion-present soils had a more complex and robust network with more keystone species, fewer modules, and more co-occurring associations. The microbiome in the invasion-present soils had a wider habitat niche breadth, with a higher proportion of habitat generalists and lower proportion of habitat specialists. Finally, the importance of stochasticity in the community assembly increased in the invasion-present soils, although deterministic processes still played a dominant role.

Conclusion

This study reveals the consequences to the soil microbiome of the expansion of invasive plants, which is of great significance for an in-depth understanding of the ecological impacts of plant invasion and soil-microbe ecological processes.

中文翻译：

通过入侵植物的扩张重塑土壤微生物组：结构、多样性、共生、生态位宽度和组装过程的变化

目标

了解生物入侵的生态影响是入侵生态学的核心问题。土壤微生物组控制着生态系统的功能和健康。本研究的目的是揭示由入侵植物扩张引起的土壤微生物组变化。

方法

以典型入侵植物空心莲子草为例，基于高通量测序分析了有入侵和无入侵土壤中微生物组的结构、多样性、共现模式、栖息地生态位宽度和组装过程。

结果

入侵显着改变了土壤微生物组的结构和组成。使用随机森林机器学习模型建立了一组生物标志物，以最好地代表存在入侵和不存在入侵的土壤之间微生物组的差异。植物入侵降低了土壤微生物组的β多样性，但增加了α多样性。与没有入侵的土壤相比，有入侵的土壤具有更复杂和健壮的网络，具有更多的关键物种、更少的模块和更多的共生关联。入侵存在土壤中的微生物组具有更广泛的栖息地生态位宽度，栖息地通才比例较高，栖息地专家比例较低。最后，群落组装中随机性的重要性在入侵存在的土壤中增加，