Wetlands are one of the most important terrestrial ecosystems for land‐atmosphere CH₄ exchange. A new process‐based, biophysical model to quantify CH₄ emissions from natural wetlands was developed and integrated into a terrestrial ecosystem model (Integrated Biosphere Simulator). The new model represents a multisubstance system (CH₄, O₂, CO₂, and H₂) and describes CH₄ production, oxidation, and three transport processes (diffusion, plant‐mediated transport, and ebullition). The new model uses several critical microbial mechanisms to represent the interaction of anaerobic fermenters and homoacetogens, hydrogenotrophic, and acetoclastic methanogens, and methanotrophs in CH₄ production and oxidation. We applied the model to 24 different wetlands globally to compare the simulated CH₄ emissions to observations and conducted a sensitivity analysis. The results indicated that (1) for most sites, the model was able to capture the magnitude and variation of observed CH₄ emissions under varying environmental conditions; (2) the parameters that regulate dissolved organic carbon and acetate production, and acetoclastic methanogenesis had the significant impact on simulated CH₄ emissions; (3) the representation of the process components of CH₄ cycling showed that CH₄ oxidation was about half or more of CH₄ production, and plant‐mediated transport was the dominant pathway at most sites; and (4) the seasonality of simulated CH₄ emissions can be controlled by soil temperature, water table position, or combinations thereof.

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基于微生物功能组的CH4模型集成到陆地生态系统模型中：模型结构，站点级评估和敏感性分析

湿地是陆地-大气层CH ₄交换最重要的陆地生态系统之一。开发了一种新的基于过程的生物物理模型，用于量化自然湿地的CH ₄排放，并将其集成到陆地生态系统模型（集成生物圈模拟器）中。新模型表示多物质系统（CH ₄，O ₂，CO ₂和H ₂）并描述CH ₄生产，氧化和三个运输过程（扩散，植物介导的运输和沸腾）。新模型使用了几种关键的微生物机制来代表厌氧发酵罐与同型产乙酸菌，氢营养型和乙酰碎裂产甲烷菌以及甲烷营养菌在CH ₄产生和氧化中的相互作用。我们将该模型应用于全球24个不同的湿地，以将模拟的CH ₄排放与观测值进行比较，并进行了敏感性分析。结果表明（1）对于大多数站点，该模型都能捕获所观测到的CH ₄的大小和变化。在变化的环境条件下的排放；（2）调节溶解性有机碳和乙酸盐生产的参数，以及碎裂甲烷化作用对模拟的CH ₄排放有显着影响；（3）CH ₄循环过程成分的表示表明，CH ₄氧化大约占CH ₄产生的一半或更多，而植物介导的运输是大多数场所的主要途径。（4）模拟CH ₄排放的季节可以通过土壤温度，地下水位或它们的组合来控制。