Department of Plant Pathology and Microbiology, University of California Riverside, CA, USA ; Department of Ecology and Evolutionary Biology, University of California Irvine, CA, USA.
Front Microbiol. 2013 Aug 14;4:225. doi: 10.3389/fmicb.2013.00225. eCollection 2013.
Methane is an important anthropogenic greenhouse gas that is produced and consumed in soils by microorganisms responding to micro-environmental conditions. Current estimates show that soil consumption accounts for 5-15% of methane removed from the atmosphere on an annual basis. Recent variability in atmospheric methane concentrations has called into question the reliability of estimates of methane consumption and calls for novel approaches in order to predict future atmospheric methane trends. This review synthesizes the environmental and climatic factors influencing the consumption of methane from the atmosphere by non-wetland, terrestrial soil microorganisms. In particular, we focus on published efforts to connect community composition and diversity of methane-cycling microbial communities to observed rates of methane flux. We find abundant evidence for direct connections between shifts in the methane-cycling microbial community, due to climate and environmental changes, and observed methane flux levels. These responses vary by ecosystem and associated vegetation type. This information will be useful in process-based models of ecosystem methane flux responses to shifts in environmental and climatic parameters.
甲烷是一种重要的人为温室气体，它在土壤中由微生物响应微环境条件而产生和消耗。目前的估计表明，土壤消耗占每年从大气中去除的甲烷量的 5-15%。大气甲烷浓度的最近变化引起了对甲烷消耗估计的可靠性的质疑，并呼吁采用新的方法来预测未来大气甲烷的趋势。本综述综合了影响非湿地陆地土壤微生物从大气中消耗甲烷的环境和气候因素。特别是，我们专注于已发表的努力，将甲烷循环微生物群落的组成和多样性与观测到的甲烷通量联系起来。我们发现大量证据表明，由于气候和环境变化，甲烷循环微生物群落的变化与观测到的甲烷通量水平之间存在直接联系。这些反应因生态系统和相关植被类型而异。这些信息将对基于过程的生态系统甲烷通量对环境和气候参数变化的响应模型有用。
