Short-term effects of soil moisture on soil organic carbon decomposition in a coastal wetland of the Yellow River Delta
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WETLAND ECOSYSTEMS
Short-term effects of soil moisture on soil organic carbon decomposition in a coastal wetland of the Yellow River Delta Wendi Qu . Guangxuan Han . Jian Wang . Juanyong Li . Mingliang Zhao . Wenjun He . Xinge Li . Siyu Wei
Received: 28 June 2020 / Revised: 14 September 2020 / Accepted: 21 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract Soil moisture remarkably influences soil organic carbon (SOC) decomposition and is one of the key variables in ecological models influencing changes in soil carbon (C) storage. However, the mechanisms determining the impact of soil moisture on SOC decomposition in coastal wetlands are poorly understood. We collected and incubated soil samples from a coastal wetland of the Yellow River Delta, China, to investigate the response of SOC decomposition (the sum of CO2–C and CH4–C) to soil moisture. Soil samples were incubated at 20%, 60%, 100%, 140% and 180% water holding capacity (WHC), respectively. Compared to drought condition (20% WHC), moist (60% and 100% WHC) and flooding (140% and 180% WHC) conditions were observed
Guest editors: Franziska Eller, Hans Brix, Brian K. Sorrell & Carlos A. Arias / Wetland ecosystems: functions and use in a changing climate W. Qu G. Han (&) J. Li M. Zhao W. He X. Li S. Wei CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, Shandong, People’s Republic of China e-mail: [email protected]
with significantly higher SOC decomposition, explained by increased soil microbial biomass and altered soil physical parameters (pH and electronic conductivity (EC)). Excluding the effect of drought, we found decreased SOC decomposition with increased microbial biomass in flooding conditions compared to moist conditions. Structural equation modeling analysis showed that SOC decomposition and soil C storage were associated with changes in soil environment and soil microbial biomass resulted from soil moisture variation. This study highlights the importance of soil moisture in soil carbon dynamics, which is enlightening for the evaluation of soil C cycling with a decline of soil moisture under a warmer climate in coastal wetlands. Keywords Soil moisture Soil organic carbon decomposition CO2 CH4 Coastal wetland
W. Qu G. Han J. Li W. He Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, People’s Republic of China J. Wang Department of Geography, The Ohio State University, Columbus, OH 43210, USA
W. Qu J. Li W. He University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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Hydrobiologia
Introduction Soil moisture, the amount of water stored in the unsaturated soil zone, is one of the key factors controlling numerous processes in terrestrial ecosystems (Hussain et al., 2011; Biederman et al., 2016; J
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