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Plants moderate the effects of emission fluxes of CO2 and CH4 on increased flooding in wetland soils |
TAN Feng-feng1, LUO Min2, ZHANG Chang-wei2, CHEN Xin2, HUANG Jia-fang1,3 |
1. School of Geographical Sciences, Fujian Normal University, Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007; 2. College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, China; 3. Wetland Ecosystem Research Station of Minjiang Estuary, National Forestry and Grassland Administration, Fuzhou 350215, China |
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Abstract Two mesocosms, with and without plants, were established in the tidal wetlands of the Minjiang Estuary, Southeast China. Each mesocosm contained three elevation treatments: control (CK), CK-20cm, and CK-40cm. The CO2 and CH4 emission fluxes under each elevation treatment in the planted and unplanted mesocosms were investigated. Overall, the results showed that increased flooding did not significantly change the total biomass or stem heights of the plants, but it increased the belowground biomass and decreased the aboveground biomass. In the planted mesocosms, the soil redox potential (ORP) and dissolved organic carbon (DOC) concentration increased with increasing flooding. In the unplanted mesocosms, the DOC concentration also increased with increasing flooding, but the soil ORP did not change. In the planted mesocosms, compared to the CK treatment, CO2 emission flux increased by 43% and 61%, respectively and CH4 emission flux increased by 66% and 84%, respectively for the CK-20cm and CK-40cm treatments. In the unplanted mesocosms, the emission fluxes of CO2 and CH4 did not significantly change with increasing flooding. Within 50 to 100 years of sea level rises in the future, the sustained-flux global warming potential of vegetated tidal wetland will increase, while the soil organic carbon storage will decrease. Conversely, in unvegetated tidal wetlands, the sustained-flux global warming potential will decrease, while the storage of soil organic carbon will not change.
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Received: 16 May 2022
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