To understand patterns in CO₂ partial pressure (P_CO2) over time in wetlands’ surface water and porewater, we examined the relationship between P_CO2 and land–atmosphere flux of CO₂ at the ecosystem scale at 22 Northern Hemisphere wetland sites synthesized through an open call. Sites spanned 6 major wetland types (tidal, alpine, fen, bog, marsh, and prairie pothole/karst), 7 Köppen climates, and 16 different years. Ecosystem respiration (R_eco) and gross primary production (GPP), components of vertical CO₂ flux, were compared to P_CO2, a component of lateral CO₂ flux, to determine if photosynthetic rates and soil respiration consistently influence wetland surface and porewater CO₂ concentrations across wetlands. Similar to drivers of primary productivity at the ecosystem scale, P_CO2 was strongly positively correlated with air temperature (T_air) at most sites. Monthly average P_CO2 tended to peak towards the middle of the year and was more strongly related to R_eco than GPP. Our results suggest R_eco may be related to biologically driven P_CO2 in wetlands, but the relationship is site-specific and could be an artifact of differently timed seasonal cycles or other factors. Higher levels of discharge do not consistently alter the relationship between R_eco and temperature normalized P_CO2. This work synthesizes relevant data and identifies key knowledge gaps in drivers of wetland respiration.

为了了解湿地地表水和孔隙水中 CO ₂分压 (P _{CO2 ) 随时间变化的模式，我们在北半球 22 个湿地站点的生态系统尺度上研究了 P CO2}与陆地-大气 CO ₂通量之间的关系，这些数据通过公开通话。地点涵盖 6 种主要湿地类型（潮汐、高山、沼泽、沼泽、沼泽和草原坑洼/喀斯特）、7 种柯本气候和 16 个不同年份。将生态系统呼吸 (R _eco ) 和总初级生产 (GPP)（垂直 CO _{2通量的组成部分）与 P CO2 （横向 CO 2}通量的组成部分）进行比较，以确定光合速率和土壤呼吸是否持续影响湿地表面和孔隙水 CO _{2 个}湿地浓度。与生态系统规模的初级生产力驱动因素类似，P _CO2与大多数地点的气温 (T _air ) 呈强烈正相关。月平均 P _CO2往往在年中达到峰值，并且与 R _{eco 的}相关性比与 GPP 的相关性更强。我们的结果表明，R _{eco可能与湿地中生物驱动的 P CO2}有关，但这种关系是特定地点的，并且可能是不同时间季节周期或其他因素的产物。_{较高水平的排放不会始终改变 R eco}和温度归一化 P _CO2之间的关系。这项工作综合了相关数据并确定了湿地呼吸驱动因素的关键知识差距。