Li Wei, Chen Huai, Yan Zhiying, Yang Gang, Rui Junpeng, Wu Ning, He Yixin
Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China.
Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, China.
Front Microbiol. 2020 Mar 18;11:343. doi: 10.3389/fmicb.2020.00343. eCollection 2020.
Climate change and water table drawdown impact the community structure and diversity of peatland soil prokaryotes. Nonetheless, how soil prokaryotes of different water tables respond to climate change remains largely unknown. This study used 16S rRNA gene sequencing to evaluate the variation in soil prokaryotes under scenarios of warming, rainfall reduction, and their combination in different water table peatlands on the Zoige Plateau in China. Stimulated climate change affected some of the diversity indexes and relative abundances of soil prokaryotes in three water table peatlands. Additionally, those from the dry-rewetting event peatland had the most dominant phyla (genera) that showed significant changes in a relative abundance due to the simulated climate change treatments. Regarding functional microbial groups of carbon and nitrogen cycling, simulated climate change did not affect the abundances of the Euryarchaeota, Proteobacteria, Verrucomicrobia, and in three water table peatlands, except NC10 and Nitrospirae. Redundancy analysis showed that the prokaryotic community variation was primary impacted by site properties of the different water table peatlands rather than the simulated climate change treatments. Moreover, the water table, total carbon, total nitrogen, and soil pH were the primary factors for the overall variation in the soil prokaryotic structure. This study provides a theoretical guidance for management strategies in the Zoige peatland, under climate change scenarios. More attention should be given to the interactive effects of peatland water table drawdown and simulated climate changes for better restorative efforts in water table drawdown, rather than simply adapting to climate change.
气候变化和地下水位下降影响着泥炭地土壤原核生物的群落结构和多样性。尽管如此，不同地下水位的土壤原核生物如何应对气候变化仍 largely unknown。本研究利用 16S rRNA 基因测序来评估中国若尔盖高原不同地下水位泥炭地在升温、降水减少及其组合情景下土壤原核生物的变化。模拟气候变化影响了三个地下水位泥炭地中土壤原核生物的一些多样性指数和相对丰度。此外，干湿交替事件泥炭地中的原核生物具有最主要的门类（属），其相对丰度因模拟气候变化处理而发生显著变化。关于碳氮循环的功能微生物群，模拟气候变化并未影响三个地下水位泥炭地中广古菌门、变形菌门、疣微菌门以及除 NC10 和硝化螺旋菌门之外的其他门类的丰度。冗余分析表明，原核生物群落变化主要受不同地下水位泥炭地的场地特性影响，而非模拟气候变化处理。此外，地下水位、总碳、总氮和土壤 pH 是土壤原核生物结构总体变化的主要因素。本研究为若尔盖泥炭地在气候变化情景下的管理策略提供了理论指导。应更多关注泥炭地地下水位下降与模拟气候变化的交互作用，以便在地下水位下降时进行更好的恢复工作，而不是简单地适应气候变化。
