Response of the soil bacterial community to seasonal variations and land reclamation in a desert grassland

作者：Yaqing Pan, Peng Kang, Xuan Qu, Hongxia Zhang, Xinrong Li · 发表于：Ecological Indicators · 年份：2024 · DOI：10.1016/j.ecolind.2024.112227 · 被引用次数：33 · 研究领域：Microbial Community Ecology and Physiology、Soil Carbon and Nitrogen Dynamics、Biocrusts and Microbial Ecology

Soil bacteria are important participants in biogeochemical cycles, and the stability of their community structure is not only affected by fluctuations in time and environment, but also by the participation and regulation of anthropogenic interference. With the increasing reclamation of farmland in the agropastoral transitional zone of northern China, it is imperative to understand the characteristics of soil bacterial communities in response to seasonal variations and anthropogenic reclamation. In this study, desert grassland, artificial shrubland, and desert grassland reclaimed farmland on the western side of the Mu Us Sandy Land were used as research objects. The following main results were obtained through soil sampling in April and September, and physicochemical analyses combined with 16S high-throughput sequencing: seasonal variations increased soil pH and soil water content, whereas land reclamation significantly increased soil total carbon, total phosphorus, soil available phosphorus, and soil available potassium contents. Changes in soil physicochemical properties altered the structure of soil bacterial communities to varying degrees, with Actinobacteriota and Acidobacteriota being the differential phyla among the three sampling sites under seasonal variations ( p < 0.05). The relative abundance of Actinobacteriota was significantly higher in April than in September at all three sampling sites, and that of Acidobacteriota was significantly lower in April than in Septe...