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| Redox mechanisms by which water table fluctuations in the critical zone of soil/sediment wet-dry alternation regulate greenhouse gases emissions |
| Received:December 18, 2024 |
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| KeyWord:water level fluctuations;natural organic matter（NOM）;redox;aquatic-terrestrial ecotone;greenhouse gases |
| Author Name | Affiliation | E-mail | | YANG Chenggong | Nanjing University of Information Science and Technology, Nanjing 210044, China | | | QIAN Chang | Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WANG Ningxin | Nanjing University of Information Science and Technology, Nanjing 210044, China
Nanjing Institute of Technology, Nanjing 211167, China | | | WU Junming | Nanjing University of Information Science and Technology, Nanjing 210044, China | | | YU Jieyu | Southern University of Science and Technology, Shenzhen 518000, China | | | ZHOU Xudong | Nanjing Hydraulic Research Institute, Ministry of Water Resources, Nanjing 210029, China | | | LIU Yixuan | School of Earth Sciences, Tianjin University, Tianjin 300100, China | | | LI Shun | Institute of Microbial Technology, Shandong University, Qingdao 266237, China | | | YU Zhiguo | Nanjing University of Information Science and Technology, Nanjing 210044, China | zhiguo.yu@nuist.edu.cn |
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| Abstract: |
| In recent years, frequent extreme climate events have led to significant fluctuations in water levels within the riparian zones of aquatic ecosystems. The varying water level heights, flooding durations, and the frequency of wet-dry cycles have a substantial impact on the emission of greenhouse gases from soils/sediments in aquatic-terrestrial ecotone. Natural organic matter（NOM）, as a redox-active substance, is widely distributed in the soils/sediments of riparian zones and can drive the oxidation and reduction of elements to competitively obtain the electron sources required for the generation of greenhouse gases such as CO2 and CH4, thereby participating in the regulation of greenhouse gas emissions. Therefore, this review summarizes the current state of research on the dynamic micro-mechanisms of NOM regulating electron flow during dry-wet alternation cycles under varying water levels, as well as the corresponding changes in microbial structure and function. Furthermore, it discusses the biogeochemical coupling mechanisms by which vertical water level changes regulate the emission of greenhouse gases in riparian zones. Meanwhile, this review also explores different ecosystem models currently used for carbon cycle simulation of terrestrial water bodies and prediction of greenhouse gas emissions, and focuses on elaborating the potential advantages of the redox-based global ecosystem model. To sum up, a series of influencing factors have led to the uncertainty in carbon emission accounting in aquatic-terrestrial ecotone. |
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