A 3-Year In-Situ Measurement of CO2 Efflux in Coastal Wetlands: Understanding Carbon Loss through Ecosystem Respiration and its Partitioning

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  • Xueyang Yu, Ministry of Land and Resources P.R.C., Qingdao National Laboratory for Marine Science and Technology
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  • Siyuan Ye, Ministry of Land and Resources P.R.C., Qingdao National Laboratory for Marine Science and Technology, China Geological Survey
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  • Linda Olsson, Sino-Danish Centre for Education and Research
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  • Mengjie Wei, Ministry of Land and Resources P.R.C., Qingdao National Laboratory for Marine Science and Technology
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  • Ken W. Krauss, United States Geological Survey
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  • Hans Brix

Understanding the link between ecosystem respiration (Reco) and its influential factors is necessary to evaluate the sources of gaseous carbon loss in coastal wetlands. Seablite (Suaeda salsa Pall.) is the main vegetation type pioneering temperate coastal wetlands in northeast China, and is generally an understudied wetland type. To evaluate the influence of environmental factors on Reco, a multi-year in-situ experiment was carried out during the growing seasons of 2012 to 2014. Total CO2 efflux was measured and separated further into soil microbial and belowground root respiration (Rs + r) and plant respiration (Rplant). Reco displayed strong seasonal variation, with effluxes as high as 845 to 1150 mg CO2 m−2 h−1 during summer months and as low as 32 to 111 mg CO2 m−2 h−1 during spring (when new shoots are sprouting) and fall (when plants are senescing) months. Aboveground plant structures contributed on average 79% to total plant biomass, and accounted for most of the Reco measured; i.e., 62–96% was associated as Rplant. Plant activity was strongly seasonal, accordingly driving Reco, with 1 g of soil-emergent S. salsa biomass (dry weight) producing approximately 1.58 mg CO2 per hour toward Reco during mid-summer. When water level was below the soil surface, Rs + r was exponentially correlated to air temperature. Because Reco for S. salsa marsh in the Liaohe Delta is controlled by plant growth cycles, inundation regime, and air temperature, this finding may be applied for national carbon budget estimation purposes from S. salsa wetlands throughout Northeast China and potentially close a key gap in understanding the role of this large wetland area in contributing to respiratory CO2 emissions globally.

Original languageEnglish
JournalWetlands
Volume40
Issue3
Pages (from-to)551-562
Number of pages12
ISSN0277-5212
DOIs
Publication statusPublished - Jun 2020

    Research areas

  • Carbon cycling, Coastal wetland, Empirical modeling, Field observation, Plant respiration, Soil respiration

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