The diversity and co-occurrence network of soil bacterial and fungal communities and their implications for a new indicator of grassland degradation

作者：Xuefeng Wu, Jingjing Yang, Hang Ruan, Shengnan Wang, Yurong Yang, Iqra Naeem, Ling Wang, Lee Liu, Deli Wang · 发表于：Ecological Indicators · 年份：2021 · DOI：10.1016/j.ecolind.2021.107989 · 被引用次数：170 · 研究领域：Microbial Community Ecology and Physiology、Gut microbiota and health、Genomics and Phylogenetic Studies

Grassland degradation is a retrogressive succession of grassland vegetation, which leads to the loss of biodiversity and the degradation of ecosystem functions. Soil microbiomes play critical roles in the functioning and services of grassland ecosystems, yet little is known about how their diversity, structure and co-occurrence network characteristics respond to grassland degradation. Here, we used lllumina Miseq technique to evaluate soil bacterial and fungal communities in a meadow steppe with different degrees of degradation in Northeastern China. Our results showed that Actinobacteria, Proteobacteria, and Chloroflexi and Acidobacteria were the dominant bacterial phyla, while Ascomycota, Basidiomycota, and Zygomycota were the predominant fungal phyla. The relative abundance of taxa assigned to Actinobacteria, Gemmatimonadetes, Firmicutes, and Deinococcus-Thermus increased with increasing degradation degrees, whereas those affiliated with Acidobacteria and Nitrospirae showed a decreasing pattern. Compared to bacteria, the relative abundance of most fungal phyla decreased gradually along the degradation gradient. Bacterial Shannon diversity index possessed a similar hump pattern, while fungal diversity decreased with increasing degree of grassland degradation. Bacterial and fungal communities have different responses to grassland degradation, indicating that fungi are more sensitive to grassland degradation than bacteria. Both bacterial and fungal community structures were s...