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Impact of Warming on Greenhouse Gas Production and Microbial Diversity in Anoxic Peat From a Sphagnum-Dominated Bog (Grand Rapids Minnesota United States)

机译：变暖对以泥炭藓为主的沼泽中缺氧性泥炭中温室气体产生和微生物多样性的影响（美国明尼苏达州大急流城）

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Climate warming is predicted to increase heterotrophic metabolism in northern peatland soils leading to enhanced greenhouse gas emissions. However, the specific relationships between temperature and the greenhouse gas producing microbial communities are poorly understood. Thus, in this study, the temperature dependence of carbon dioxide (CO2) and methane (CH4) production rates along with abundance and composition of microbial communities were investigated in peat from a Sphagnum-dominated peatland, S1 bog (Minnesota, United States). Whereas CH4 production rates increased with temperature up to 30°C, CO2 production did not, resulting in a lower CO2:CH4 ratio with increasing temperature. CO2 production showed both psychrophilic and mesophilic maxima at 4 and 20°C, respectively, and appears to be mediated by two anaerobic microbial communities, one that operates under psychrophilic conditions that predominate for much of the year, and another that is more active under warmer conditions during the growing season. In incubations at 10°C above the ambient range, members of the Clostridiaceae and hydrogenotrophic methanogens of the Methanobacteriaceae dominated. Moreover, a significant negative correlation between temperature and microbial diversity was observed. Results indicate that the potential consequences of warming surface peat in northern peatlands include a large stimulation in CH4 production and a significant loss of microbial diversity.
机译：预计气候变暖会增加北部泥炭地土壤的异养代谢，导致温室气体排放增加。然而，人们对温度与产生温室气体的微生物群落之间的具体关系知之甚少。因此，在这项研究中，研究了在以泥炭藓为主的泥炭地S1沼泽（美国明尼苏达州）的泥炭中，二氧化碳（CO2）和甲烷（CH4）的生产率与温度的依赖性以及微生物群落的组成。 CH4的生成速率随温度升高至30°C而增加，而CO2的生成速率并未随温度的升高而降低。 CO2的产生分别在4°C和20°C时同时表现出嗜温性和嗜温性最大值，并且似乎是由两个厌氧微生物群落介导的，一个厌氧微生物群落在一年中的大部分时间都处于嗜酸性条件下运行，而另一个则在温度较高时更加活跃生长季节的条件。在高于环境温度10°C的温育中，梭菌科成员和甲烷菌科的氢营养型产甲烷菌占主导地位。此外，观察到温度和微生物多样性之间的显着负相关。结果表明，北部泥炭地表泥炭变暖的潜在后果包括大量刺激CH4的产生和微生物多样性的显着丧失。

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