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Evidence of Microbial Regulation of Biogeochemical Cycles from a Study on Methane Flux and Land Use Change

机译：甲烷通量与土地利用变化研究的生物地球化学循环微生物调控证据

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Microbes play an essential role in ecosystem functions, including carrying out biogeochemical cycles, but are currently considered a black box in predictive models and all global biodiversity debates. This is due to (i) perceived temporal and spatial variations in microbial communities and (ii) lack of ecological theory explaining how microbes regulate ecosystem functions. Providing evidence of the microbial regulation of biogeochemical cycles is key for predicting ecosystem functions, including greenhouse gas fluxes, under current and future climate scenarios. Using functional measures, stable-isotope probing, and molecular methods, we show that microbial (community diversity and function) response to land use change is stable over time. We investigated the change in net methane flux and associated microbial communities due to afforestation of bog, grassland, and moorland. Afforestation resulted in the stable and consistent enhancement in sink of atmospheric methane at all sites. This change in function was linked to a niche-specific separation of microbial communities (methanotrophs). The results suggest that ecological theories developed for macroecology may explain the microbial regulation of the methane cycle. Our findings provide support for the explicit consideration of microbial data in ecosystem/climate models to improve predictions of biogeochemical cycles.
机译：微生物在生态系统功能（包括进行生物地球化学循环）中起着至关重要的作用，但目前在预测模型和所有全球生物多样性辩论中被视为黑匣子。这是由于（i）感知到的微生物群落的时空变化和（ii）缺乏解释微生物如何调节生态系统功能的生态理论。提供生物地球化学循环的微生物调控的证据是预测当前和未来气候情景下生态系统功能（包括温室气体通量）的关键。使用功能度量，稳定同位素探测和分子方法，我们表明微生物对土地利用变化的响应（社区多样性和功能）随着时间的推移是稳定的。我们调查了由于沼泽，草地和高地造林而造成的甲烷净通量及相关微生物群落的变化。植树造林导致所有地点大气甲烷汇的稳定稳定增长。功能上的这种变化与微生物群落（甲烷营养菌）的生态位特异性分离有关。结果表明，为宏观生态学发展的生态学理论可以解释甲烷循环的微生物调控。我们的发现为在生态系统/气候模型中明确考虑微生物数据以改善生物地球化学循环的预测提供了支持。

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