Carbon Emissions From Chinese Inland Waters: Current Progress and Future Challenges,Journal of Geophysical Research: Biogeosciences

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Carbon Emissions From Chinese Inland Waters: Current Progress and Future Challenges
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2024-02-24 , DOI: 10.1029/2023jg007675
Qianqian Yang ₁ , Shuai Chen ₁ , Yuxin Li ₁ , Boyi Liu ₁ , Lishan Ran ₁

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Inland waters are significant emitters of greenhouse gases for the atmosphere and play an important role in the global carbon cycle. With a vast land area in East Asia spanning a broad range of climatic conditions, China has a large number of natural and human-made water bodies. These inland water systems are of global importance because of their high carbon emission fluxes. Over the past decades, China has experienced unprecedented environmental changes driven by rapid economic development, which have profoundly modified its inland water carbon biogeochemistry and associated emissions. This review focuses on carbon dioxide (CO₂) and methane (CH₄) emission dynamics from China's inland waters in response to global change. Major drivers of CO₂ and CH₄ emissions, including aquatic metabolism, hydrological and climatic factors, and prevailing human impacts, are examined. To advance our understanding of carbon emissions from China's inland waters, we further identify several critical knowledge gaps, such as inadequate research in headwater streams and the climate-sensitive Tibetan Plateau aquatic ecosystems. Furthermore, insufficient understanding of carbon emissions from inland waters undergoing extensive human interventions (e.g., damming, flow regulation, pollution, and farming practices in aquaculture ponds) is highlighted. We suggest that future efforts should be made to better capture the spatiotemporal heterogeneity in dissolved CO₂ and CH₄ concentrations and fluxes across China as well as their long-term trends. To overcome uncertainties in carbon sources and current flux estimates, future research to mechanistically understand carbon transport and transformation in Chinese inland waters and their underlying processes is particularly needed.

更新日期：2024-02-24

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