气候变化领域集成服务门户(CCPortal): Effect of Drought-Induced Salinization on Wetland Methane Emissions; Gross Ecosystem Productivity; and Their Interactions

CCPortal

DOI	10.1007/s10021-019-00430-5
	Effect of Drought-Induced Salinization on Wetland Methane Emissions; Gross Ecosystem Productivity; and Their Interactions
	Chamberlain S.D.; Hemes K.S.; Eichelmann E.; Szutu D.J.; Verfaillie J.G.; Baldocchi D.D.
发表日期	2020
ISSN	14329840
起始页码	675
结束页码	688
卷号	23 期号:3
英文摘要	Salinity gradients across estuaries influence wetland carbon storage, methane (CH4) biogeochemistry, and plant productivity. Estuarine freshwater wetlands may experience increases in salinity during drought; however, the impact of salinization on greenhouse gas (GHG) emissions is uncertain. We measured ecosystem-scale GHG emissions from a wetland experiencing salinization during the 2011–2017 California drought and used information theory analyses to quantify couplings and causal interactions between CH4 fluxes and two dominant environmental drivers; gross ecosystem photosynthesis and temperature. Machine learning models were then used to estimate salinization-induced changes in CH4 fluxes and plant productivity. We observed dynamic CH4 flux-driver relationships across the salinization disturbance event, where temperature connections strengthened, and productivity connections dampened during salinization. Annual gross ecosystem productivity reduced by 64% during peak salinization, whereas annual CH4 emissions only reduced by 10%, suggesting that other CH4 substrate sources compensated for reductions in recent photosynthate. Our results demonstrate the value of applying information theory and machine learning approaches to ecological analyses and suggest that drought-induced salinization may increase GHG emissions from estuarine freshwater wetlands., Springer Science+Business Media, LLC, part of Springer Nature.
英文关键词	carbon dioxide; complex systems; eddy covariance; peatland; photosynthesis; saltwater intrusion; transfer entropy
scopus关键词	carbon flux; drought; greenhouse gas; machine learning; methane; net ecosystem production; photosynthesis; wetland; California; United States
来源期刊	Ecosystems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176937
作者单位	Department of Environmental Science, Policy, and Management, University of California, 130 Mulford Hall, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Chamberlain S.D.,Hemes K.S.,Eichelmann E.,et al. Effect of Drought-Induced Salinization on Wetland Methane Emissions; Gross Ecosystem Productivity; and Their Interactions[J],2020,23(3).
APA	Chamberlain S.D.,Hemes K.S.,Eichelmann E.,Szutu D.J.,Verfaillie J.G.,&Baldocchi D.D..(2020).Effect of Drought-Induced Salinization on Wetland Methane Emissions; Gross Ecosystem Productivity; and Their Interactions.Ecosystems,23(3).
MLA	Chamberlain S.D.,et al."Effect of Drought-Induced Salinization on Wetland Methane Emissions; Gross Ecosystem Productivity; and Their Interactions".Ecosystems 23.3(2020).