Land use shapes the microbial community structure by altering soil aggregates and dissolved organic matter components

作者：Zongpeng Zhang, Lijuan Hu, Yating Liu, Yixuan Guo, Shiming Tang, Jie Ren · 发表于：Journal of Integrative Agriculture · 年份：2024 · DOI：10.1016/j.jia.2024.07.018 · 被引用次数：23 · 研究领域：Microbial Community Ecology and Physiology、Gut microbiota and health、Soil Carbon and Nitrogen Dynamics

The agro-pastoral ecotone epitomizes the ecologically fragile semi-arid zone, where the soil microbiomes play a pivotal role in regulating its multifunctionality. However, whether and how changes in soil structure and organic matter composition under different land uses affect microbial community structure remain unclear. Here, land-use types in the agro-pastoral ecotone, including shrubland (BF), artificial grassland (ArG), abandoned grassland (AbG), and maize farmland (MA), were chosen to explore the response relationships between soil microbial communities and the aggregates and dissolved organic matter (DOM) composition. The results showed that compared to MA, the macroaggregates in BF, AbG, and ArG were increased by 123.0, 92.79, and 63.71%, respectively, while MA soil had the greatest abundance of <100 μm particles. The higher aromatic carbon with high aromaticity and molecular weight in BF soil DOM contributed to its highest mineral-associated organic carbon level (12.61 g kg-1), while MA soil organic carbon had highly efficient decomposition due to its high content of aliphatic and carboxy carbon, so it is prone to loss from the active carbon pools. The transition in land use from shrubland to grassland and farmland has facilitated the conversion of stable aromatic carbon to unstable carboxy carbon. The taxonomic analysis revealed that soil bacterial and fungal communities in the four land uses were dominated by Proteobacteria, Actinobacteriota, Chloroflexi, and Ascom...