Wetland CH₄ emissions have been demonstrated to be more sensitive than wetland CO₂ emissions to increasing temperatures, which may result in a greater relative contribution of CH₄ to total GHG emissions under climate warming. However, it is not clear whether this greater sensitivity occurs globally across diverse hydrologic regimes. Here, we evaluate the temperature dependence of CO₂ and CH₄ emissions on water table depth using a global database and show similarities in the temperature dependence of CO₂ and CH₄ emissions. A lower water table is associated with a decrease in the temperature dependence of CH₄ emissions and a higher water table has the opposite effect. Water table depth does not affect the temperature dependence of CO₂ emissions. Our findings suggest the stimulatory effect of increasing temperature on wetland CH₄ emissions may not always be stronger than that on CO₂ emissions and depends on the wetland water table.

已证明湿地 CH _{4排放比湿地 CO 2}排放对温度升高更敏感，这可能导致气候变暖下 CH ₄对总温室气体排放的相对贡献更大。然而，尚不清楚这种更大的敏感性是否会在全球范围内跨越不同的水文状况。在这里，我们使用全球数据库评估了 CO ₂和 CH ₄排放对地下水位深度的温度依赖性，并显示了 CO ₂和 CH ₄排放的温度依赖性的相似性。较低的地下水位与 CH _{4的温度依赖性降低有关}排放和更高的地下水位会产生相反的效果。地下水位深度不影响CO ₂排放的温度依赖性。我们的研究结果表明，温度升高对湿地 CH ₄排放的刺激作用可能并不总是强于对 CO ₂排放的刺激作用，并且取决于湿地地下水位。