题名：Methane Emissions from Estuarine Coastal Wetlands: Implications for Global Change Effect

来源：Soil Science Society of America Journal

发表年代：2019年

作者：Lijie Liu, Dongqi Wang*, Shu Chen, Zhongjie Yu, Yunkai Xu, Yu Li, Zhenming Ge*, Zhenlou Chen

Abstract  Global warming, rising sea levels, and saltwater intrusion interact to affect carbon cycling, specifically methane (CH₄) flux in estuarine coastal wetlands. In the present study, Phragmites australis and Spartina alterniflora communities in the intertidal zone of the Yangtze estuary were selected for investigating CH₄ flux under different temperature (natural/warming), water level (high/low), and salinity (0, 5, 15, and 30‰) conditions. The average CH4 flux (from April to October 2016) under natural conditions was 141.0 ± 21.5 and 502.8 ± 65.3 μmol m⁻² h⁻¹ for P. australis and S. alterniflora communities, respectively. Warming had a particularly pronounced effect on CH₄ emissions from the P. australis community and increased CH₄ flux by 130%. There was a significant correlation between CH₄ flux and water level; at high water levels, CH₄ flux was 2.64- and 3.78-fold higher in P. australis and S. alterniflora communities, respectively. Salinity had a significant pronounced effect on CH₄ emissions from the P. australis community, and there was a clear order (5‰ > 15‰ > 0‰ > 30‰) in CH₄ flux. The interaction between temperature and water level was the most important factor controlling CH₄ flux from wetlands; CH₄ emissions were greater at higher temperature and higher water levels. However, at low water level, the effect of salinity was more prominent. The results suggest that CH₄ flux from estuarine wetlands could be further enhanced in the future under the influence of rising sea levels due to global warming.

Methane Emissions from Estuarine Coastal Wetlands Implications for Global Change Effect.pdf