环境科学
生态系统
土壤碳
固碳
气候变化
生态学
碳循环
草原
陆地生态系统
微生物种群生物学
全球变化
土壤水分
土壤科学
生物
二氧化碳
遗传学
细菌
作者
Qi Qi,Haowei Yue,Zhenhua Zhang,Joy D. Van Nostrand,Linwei Wu,Xue Guo,Jiajie Feng,Mengmeng Wang,Shu Yang,Jianshu Zhao,Qun Gao,Qiuting Zhang,Mengxin Zhao,Chi Xie,Zhijun Ma,Jin‐Sheng He,Haiyan Chu,Yi Huang,Jizhong Zhou,Yunfeng Yang
出处
期刊:MBio
[American Society for Microbiology]
日期:2021-02-23
卷期号:12 (1)
被引量:10
标识
DOI:10.1128/mbio.00761-20
摘要
Soil microorganisms are sensitive to temperature in cold ecosystems, but it remains unclear how microbial responses are modulated by other important climate drivers, such as precipitation changes. Here, we examine the effects of six in situ warming and/or precipitation treatments in alpine grasslands on microbial communities, plants, and soil carbon fluxes. These treatments differentially affected soil carbon fluxes, gross primary production, and microbial communities. Variations of soil CO2 and CH4 fluxes across all sites significantly (r > 0.70, P < 0.050) correlated with relevant microbial functional abundances but not bacterial or fungal abundances. Given tight linkages between microbial functional traits and ecosystem functionality, we conclude that future soil carbon fluxes in alpine grasslands can be predicted by microbial carbon-degrading capacities.IMPORTANCE The warming pace in the Tibetan Plateau, which is predominantly occupied by grassland ecosystems, has been 0.2°C per decade in recent years, dwarfing the rate of global warming by a factor of 2. Many Earth system models project substantial carbon sequestration in Tibet, which has been observed. Here, we analyzed microbial communities under projected climate changes by 2100. As the soil "carbon pump," the growth and activity of microorganisms can largely influence soil carbon dynamics. However, microbial gene response to future climate scenarios is still obscure. We showed that the abundances of microbial functional genes, but not microbial taxonomy, were correlated with carbon fluxes and ecosystem multifunctionality. By identifying microbial traits linking to ecosystem functioning, our results can guide the assessment of future soil carbon fluxes in alpine grasslands, a critical step toward mitigating climate changes.
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