Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, PR China; State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, PR China.
Environ Pollut. 2023 Aug 1;330:121754. doi: 10.1016/j.envpol.2023.121754. Epub 2023 May 1.
Wetlands sequestrate carbon at the highest rate than any other ecosystems on Earth. However, the spatial and temporal dynamics of GHGs emissions from the wetland ecosystems in China are still elusive. We synthesized 166 publications that contain 462 in situ measurements of GHGs emissions from the natural wetlands in China, and further analyzed the variability and the drivers of GHGs emissions in eight subdivisions of China's wetlands. The results show that the current studies are mainly concentrated in the estuaries, Sanjiang Plain, and Zoige wetlands. The average CO emissions, CH fluxes and NO fluxes from Chinese wetlands were 218.84 mg·m·h, 1.95 mg·m·h and 5.8 × 10 mg·m·h, respectively. The global warming potential (GWP) of China's wetlands was estimated to be 1881.36 TgCO-eq·yr, with CO emissions contributing more than 65% to the GWP value. The combined GWP values of Qinghai-Tibet Plateau wetlands, coastal wetlands and northeastern wetlands account for 84.8% of GWP of China's wetlands. Correlation analysis showed that CO emissions increased with the increasing mean annual temperature, elevation, annual rainfall, and wetland water level, but decreased with soil pH. CH fluxes increased with the mean annual temperature and soil water content but decreased with the redox potential. This study analyzed the drivers of GHGs emissions from wetland ecosystems at the national scale, and GWP values of eight wetland subregions of China were comprehensively assessed. Our results are potentially useful for the global GHGs inventory, and can help assess the response of GHGs emissions of wetland ecosystem to environmental and climate change.
湿地以高于地球上任何其他生态系统的速率固碳。然而，中国湿地生态系统温室气体排放的时空动态仍然难以捉摸。我们综合了 166 篇包含中国自然湿地温室气体排放原位测量的出版物，并进一步分析了中国湿地 8 个分区温室气体排放的变异性及其驱动因素。结果表明，目前的研究主要集中在河口、三江平原和若尔盖湿地。中国湿地的 CO2 排放、CH4 通量和 NO 通量的平均值分别为 218.84mg·m·h、1.95mg·m·h 和 5.8×10mg·m·h。中国湿地的全球变暖潜势（GWP）估计为 1881.36TgCO-eq·yr，其中 CO2 排放对 GWP 值的贡献超过 65%。青藏高原湿地、沿海湿地和东北湿地的综合 GWP 值占中国湿地 GWP 的 84.8%。相关分析表明，CO2 排放随着年平均气温、海拔、年降雨量和湿地水位的增加而增加，但随着土壤 pH 值的降低而减少。CH4 通量随着年平均气温和土壤水分含量的增加而增加，但随着氧化还原电位的降低而减少。本研究分析了国家尺度湿地生态系统温室气体排放的驱动因素，并综合评估了中国八个湿地亚区的 GWP 值。我们的研究结果对于全球温室气体清单具有潜在的重要性，并有助于评估湿地生态系统温室气体排放对环境和气候变化的响应。
