Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows

• DOI: 10.3389/fmicb.2022.1063027
• Publication Date: 2022-12-08T06:16:45Z
• Authors: Danhong Chen; Haiyan Hou; Shutong Zhou; Song Zhang; Dong Liu; Zhe Pang; Jinming Hu; Kai Xue; Jianqing Du; Xiaoyong Cui; Yanfen Wang; Rongxiao Che
• Keywords: riparian wetlands; 0301 basic medicine; Qinghai–Tibet Plateau; 03 medical and health sciences; 13. Climate action; alpine meadows; nitrogen fixers; 15. Life on land; global warming; Microbiology; QR1-502; 6. Clean water

Global warming can trigger dramatic glacier area shrinkage and change the flux of glacial runoff, leading to expansion subsequent retreat riparian wetlands. This elicits interconversion wetlands their adjacent ecosystems (e.g., alpine meadows), probably significantly impacting ecosystem nitrogen input by changing soil diazotrophic communities. However, community differences between remain largely unexplored. Here, soils were collected from meadows at six locations foreland lake mouth along a typical Tibetan river in Namtso watershed. The abundance diversity diazotrophs determined real-time PCR amplicon sequencing based on nifH gene. assembly mechanisms analyzed via iCAMP, recently developed null model-based method. results showed that compared with wetlands, meadow decreased. profiles also differed meadows. For example, meadows, relative chemoheterotrophic sulfate-respiration was higher wetland soils. In contrast, related ureolysis, photoautotrophy, denitrification enriched iCAMP analysis mainly controlled drift dispersal limitation. Compared more affected limitation homogeneous selection. These findings suggest conversion alter mechanisms, highlighting enormous effects climate ecosystems.