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Biogeochemical processes in land-ocean interfaces, surface estuaries, subterranean estuaries and sediment-water interface
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Methane emission from mangrove wetland soils is marginal but can be stimulated significantly by anthropogenic activities
P-C2-11-S
Xiawan Zheng* , Department of Earth System Science, Tsinghua University
Jiemin Guo, Department of Botany, University of Wyoming
Weimin Song, Yantai Institute of Coastal Zone Research, Chinese Academy of Science
Jianxiang Feng, School of Life Sciences, Sun Yat-sen University
Guanghui Lin, Department of Earth System Science, Tsinghua University
Presenter Email: zhengxw16@mails.tsinghua.edu.cn |
| Mangrove wetland soils have been considered as important sources for atmospheric CH4, but the magnitude of CH4 efflux in mangrove wetlands and its relative contribution to climate warming compared to CO2 efflux remains controversial. Our aims were to clarify the magnitude of CH4 efflux in mangroves wetlands, and to evaluate the relative contribution of CH4 efflux over CO2 efflux from mangrove wetland soils to climate warming. In this study, we measured both CH4 and CO2 effluxes from mangrove soils during low or no tide periods at three tidal zones of two mangrove ecosystems in Southeastern China and collected CH4 efflux data from literature for 24 sites of mangrove wetlands worldwide. The CH4 efflux was highly variable among our field sites due to the heterogeneity of mangrove soil environments. On average, undisturbed mangrove sites have very low CH4 efflux rates (ranged from 0.65 to 14.18 ¦̀mol m-2 h-1; median 2.57 ¦̀mol m-2 h-1), often less than 10% of the global warming potentials (GWP) caused by the soil CO2 efflux from the same sites (ranged from 0.94 to 9.50 mmol m-2 h-1; median 3.67 mmol m-2 h-1) even after considering that CH4 has 28 times more GWP over CO2. Plant species, study site, tidal position, sampling time, and soil characteristics all had no significant effect on mangrove soil CH4 efflux. Combining our field measurement results and literature data, we demonstrated that the CH4 efflux from undisturbed mangrove soils was marginal in comparison with the CO2 efflux in most cases, but nutrient inputs from anthropogenic activities including nutrient run-off and aquaculture activities significantly increased CH4 efflux from mangrove soils. Therefore, CH4 efflux from mangrove wetlands are strongly influenced by anthropogenic activities and future inventories of CH4 efflux from mangrove wetlands on regional or global scale should consider this phenomenon. |
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