Candry Pieter, Abrahamson Britt, Stahl David Allan, Winkler Mari-Karoliina Henriikka
Civil and Environmental Engineering, University of Washington, Seattle, Washington, USA.
Glob Chang Biol. 2023 Sep;29(18):5169-5183. doi: 10.1111/gcb.16850. Epub 2023 Jun 29.
Wetlands are crucial nodes in the carbon cycle, emitting approximately 20% of global CH while also sequestering 20%-30% of all soil carbon. Both greenhouse gas fluxes and carbon storage are driven by microbial communities in wetland soils. However, these key players are often overlooked or overly simplified in current global climate models. Here, we first integrate microbial metabolisms with biological, chemical, and physical processes occurring at scales from individual microbial cells to ecosystems. This conceptual scale-bridging framework guides the development of feedback loops describing how wetland-specific climate impacts (i.e., sea level rise in estuarine wetlands, droughts and floods in inland wetlands) will affect future climate trajectories. These feedback loops highlight knowledge gaps that need to be addressed to develop predictive models of future climates capturing microbial contributions. We propose a roadmap connecting environmental scientific disciplines to address these knowledge gaps and improve the representation of microbial processes in climate models. Together, this paves the way to understand how microbially mediated climate feedbacks from wetlands will impact future climate change.
湿地是碳循环的关键节点，排放约全球20%的甲烷，同时封存所有土壤碳的20%-30%。温室气体通量和碳储存均由湿地土壤中的微生物群落驱动。然而，在当前的全球气候模型中，这些关键因素常常被忽视或过度简化。在此，我们首先将微生物代谢与从单个微生物细胞到生态系统尺度上发生的生物、化学和物理过程整合起来。这个概念性的尺度衔接框架指导了反馈回路的发展，描述了特定湿地气候影响（即河口湿地海平面上升、内陆湿地干旱和洪水）将如何影响未来气候轨迹。这些反馈回路突出了在开发捕捉微生物贡献的未来气候预测模型时需要填补的知识空白。我们提出了一个连接环境科学学科的路线图，以填补这些知识空白，并改善气候模型中微生物过程的表征。总之，这为理解湿地微生物介导的气候反馈将如何影响未来气候变化铺平了道路。
