Effects of Drying-Rewetting Frequency on Vertical and Lateral Loss of Soil Organic Carbon in a Tidal Salt Marsh
- PDF / 533,249 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 29 Downloads / 216 Views
WETLANDS AND CLIMATE CHANGE
Effects of Drying-Rewetting Frequency on Vertical and Lateral Loss of Soil Organic Carbon in a Tidal Salt Marsh Juanyong Li 1,2,3 & Wendi Qu 1,2,3 & Guangxuan Han 1,3 & Feng Lu 4 & Yingfeng Zhou 4 & Weimin Song 1,3 & Baohua Xie 1,3 & Franziska Eller 5 Received: 29 October 2019 / Accepted: 6 March 2020 # Society of Wetland Scientists 2020
Abstract Tidal salt marshes, as “blue carbon” ecosystems, play a critical role in mitigation of global climate change since their large soil organic carbon (SOC) pool. Drying-rewetting cycles induced by periodic tides have profound influence on soil carbon cycling in tidal salt marshes. However, the magnitude and mechaanism of the effects of drying-rewetting frequency on SOC loss in tidal salt marshes is still uncertain. Here, we conducted a mesocosm experiment to identify how drying-rewetting frequency changes alter the vertical (CO2 and CH4) and lateral (dissolved organic carbon) carbon losses of soils in a tidal salt marsh in the Yellow River Delta (YRD). We found that increasing soil moisture inhibited CO2 emission but stimulated CH4 emission in a tidal salt marsh. Soil dissolved organic carbon (DOC) was produced in the drying phase and rewetting lead to the loss of DOC. Soil moisture and salinity change induced by drying-rewetting cycles were the critical factors controlling vertical organic carbon loss in a tidal salt marsh. DOC had significant effects on CO2 emissions. Changes of tidal action and drying-rewetting cycle induced by global change can affect the pathway of carbon loss in a tidal salt marsh. Keywords Tidal salt marshes . Drying-rewetting cycle . CO2 and CH4 emissions . Dissolved organic carbon
Introduction Tidal salt marshes have been termed as one of the most important “blue carbon” ecosystems. They are efficient in sedimentation and trapping associated soil organic carbon (SOC)
* Guangxuan Han [email protected] 1
CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Chinese Academy of Sciences (CAS), Yantai, Shandong 264003, People’s Republic of China
2
University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3
Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, People’s Republic of China
4
Administration Committee of the Yellow River Delta National Nature Reserve, Dongying, Shandong 257500, People’s Republic of China
5
Department of Bioscience, Aarhus University, Ole Worms Alle 1, DK-8000 Aarhus C, Denmark
during tidal inundation (McLeod et al. 2011). Though the global area is much smaller than other types of ecosystem, e.g., forest or grassland, the carbon sequestration rates of “blue carbon” ecosystems are much greater than those of terrestrial ecosystems (McLeod et al. 2011; Lovelock et al. 2017; Ouyang et al. 2017). Carbon can be sequestered in salt marshes at a rate nearly 40 times higher than that in tropi
Data Loading...
