Fujian Agriculture and Forestry University, College of Resources and Environment, Fujian Provincial Key Laboratory of Soil Environment Health and Regulation, Fuzhou 350002, China; College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China.
College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China.
Sci Total Environ. 2023 Jun 1;875:162693. doi: 10.1016/j.scitotenv.2023.162693. Epub 2023 Mar 8.
The ongoing permafrost degradation under climate warming has modified aboveground biogeochemical processes mediated by microbes, yet groundwater microbial structure and function as well as their response to permafrost degradation remain poorly understood. We separately collect 20 and 22 sub-permafrost groundwater samples from Qilian Mountain (alpine and seasonal permafrost) and Southern Tibet Valley (plateau isolated permafrost) on the Qinghai-Tibet Plateau (QTP) to investigate the effects of permafrost groundwater characteristics on the diversity, structure, stability, and potential function of bacterial and fungal communities. Regional discrepancy of groundwater microbes between two permafrost regions reveals that permafrost degradation might reshape microbial community structure, increase community stability and potential functions relevant to carbon metabolism. Bacterial community assembly in permafrost groundwater is governed by deterministic processes, whereas fungal communities are mainly controlled by stochastic processes, suggesting that bacterial biomarkers might provide the better 'early warning signals' to permafrost degradation in deeper layers. Our study highlights the importance of groundwater microbes in ecological stability and carbon emission on the QTP.
在气候变暖的影响下，多年冻土持续退化，改变了微生物介导的地上生物地球化学过程，但地下水微生物结构和功能及其对多年冻土退化的响应仍知之甚少。我们分别从青藏高原祁连山（高山和季节性多年冻土）和藏南河谷（高原孤立多年冻土）采集了 20 和 22 个亚多年冻土地下水样本，以研究多年冻土地下水特征对细菌和真菌群落多样性、结构、稳定性和潜在功能的影响。两个多年冻土区地下水微生物的区域差异表明，多年冻土退化可能重塑微生物群落结构，增加与碳代谢相关的群落稳定性和潜在功能。多年冻土地下水中细菌群落的组装受确定性过程控制，而真菌群落主要受随机过程控制，这表明细菌生物标志物可能为更深层多年冻土退化提供更好的“早期预警信号”。本研究强调了地下水微生物在青藏高原生态稳定性和碳排放中的重要性。
