Inter-annual variability of area-scaled gaseous carbon emissions from wetland soils in the Liaohe Delta, China

PLoS ONE
By: , and 

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Abstract

Global management of wetlands to suppress greenhouse gas (GHG) emissions, facilitate carbon (C) sequestration, and reduce atmospheric CO2 concentrations while simultaneously promoting agricultural gains is paramount. However, studies that relate variability in CO2 and CH4 emissions at large spatial scales are limited. We investigated three-year emissions of soil CO2 and CH4 from the primary wetland types of the Liaohe Delta, China, by focusing on a total wetland area of 3287 km2. One percent is Suaeda salsa, 24% is Phragmites australis, and 75% is rice. While S. salsa wetlands are under somewhat natural tidal influence, P. australis and rice are managed hydrologically for paper and food, respectively. Total C emissions from CO2 and CH4 from these wetland soils were 2.9 Tg C/year, ranging from 2.5 to 3.3 Tg C/year depending on the year assessed. Primary emissions were from CO2 (~98%). Photosynthetic uptake of CO2 would mitigate most of the soil CO2 emissions, but CH4 emissions would persist. Overall, CH4 fluxes were high when soil temperatures were >18°C and pore water salinity <18 PSU. CH4 emissions from rice habitat alone in the Liaohe Delta represent 0.2% of CH4 carbon emissions globally from rice. With such a large area and interannual sensitivity in soil GHG fluxes, management practices in the Delta and similar wetlands around the world have the potential not only to influence local C budgeting, but also to influence global biogeochemical cycling.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Inter-annual variability of area-scaled gaseous carbon emissions from wetland soils in the Liaohe Delta, China
Series title PLoS ONE
DOI 10.1371/journal.pone.0160612
Volume 11
Issue 8
Year Published 2016
Language English
Publisher Public Library of Science
Contributing office(s) Wetland and Aquatic Research Center
Description Article e0160612; 20 p.
Country China
Other Geospatial Liaohe Delta
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