Explore the soil factors driving soil microbial community and structure in Songnen alkaline salt degraded grassland

Zhenyin Bai; Aomei Jia; Haixian Li; Mingjun Wang; Shanmin Qu

doi:10.3389/fpls.2023.1110685

Explore the soil factors driving soil microbial community and structure in Songnen alkaline salt degraded grassland

Front Plant Sci. 2023 May 9:14:1110685. doi: 10.3389/fpls.2023.1110685. eCollection 2023.

Authors

Zhenyin Bai¹, Aomei Jia¹, Haixian Li¹, Mingjun Wang¹, Shanmin Qu²

Affiliations

¹ College of Animal Science and Technology, Northeast Agricultural University, Harbin, China.
² College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, China.

Abstract

Introduction: Saline-alkali degradation in grassland significantly affects plant community composition and soil physical and chemical properties. However, it remains unclear whether different degradation gradients affect soil microbial community and the main soil driving factors. Therefore, it is important to elucidate the effects of saline-alkali degradation on soil microbial community and the soil factors affecting soil microbial community in order to develop effective solutions to restore the degraded grassland ecosystem.

Methods: In this study, Illumina high-throughput sequencing technology was used to study the effects of different saline-alkali degradation gradients on soil microbial diversity and composition. Three different gradients were qualitatively selected, which were the light degradation gradient (LD), the moderate degradation gradient (MD) and the severe degradation gradient (SD).

Results: The results showed that salt and alkali degradation decreased the diversity of soil bacterial and fungal communities, and changed the composition of bacterial and fungal communities. Different degradation gradients had different adaptability and tolerance species. With the deterioration of salinity in grassland, the relative abundance of Actinobacteriota and Chytridiomycota showed a decreasing trend. EC, pH and AP were the main drivers of soil bacterial community composition, while EC, pH and SOC were the main drivers of soil fungal community composition. Different microorganisms are affected by different soil properties. The changes of plant community and soil environment are the main factors limiting the diversity and composition of soil microbial community.

Discussion: The results show that saline-alkali degradation of grassland has a negative effect on microbial biodiversity, so it is important to develop effective solutions to restore degraded grassland to maintain biodiversity and ecosystem function.

Keywords: bacterial diversity; fungal diversity; grassland; saline-alkali degradation; soil driving factors.

Grants and funding

This project was supported by the Special Fund Project for Academic Backbone Project of Northeast Agricultural University (No. 21XG31); Returnees Studying Abroad of Heilongjiang Province (2021294) and the new energy field in Daqing of China “The open competition mechanism to select the best candidates” scientific and technological project (2021BD05).