Volume 42 Issue 4
Apr.  2023
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Jiahui Chen, Shichen Zeng, Min Gao, Guangcheng Chen, Heng Zhu, Yong Ye. Potential effects of sea level rise on the soil-atmosphere greenhouse gas emissions in Kandelia obovata mangrove forests[J]. Acta Oceanologica Sinica, 2023, 42(4): 25-32. doi: 10.1007/s13131-022-2087-0
Citation: Jiahui Chen, Shichen Zeng, Min Gao, Guangcheng Chen, Heng Zhu, Yong Ye. Potential effects of sea level rise on the soil-atmosphere greenhouse gas emissions in Kandelia obovata mangrove forests[J]. Acta Oceanologica Sinica, 2023, 42(4): 25-32. doi: 10.1007/s13131-022-2087-0

Potential effects of sea level rise on the soil-atmosphere greenhouse gas emissions in Kandelia obovata mangrove forests

doi: 10.1007/s13131-022-2087-0
Funds:  The National Natural Science Foundation of China under contract Nos 42076142 and 41776097; the Provincial Natural Science Foundation of Fujian under contract No. 2020J06030; the Fund of Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration under contract No. EPR2020003.
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  • Corresponding author: yeyong@xmu.edu.cn
  • Received Date: 2022-02-21
  • Accepted Date: 2022-06-27
  • Available Online: 2023-02-01
  • Publish Date: 2023-04-25
  • Mangrove forests are under the stress of sea level rise (SLR) which would affect mangrove soil biogeochemistry. Mangrove soils are important sources of soil-atmosphere greenhouse gas (GHG) emissions, including carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Understanding how SLR influences GHG emissions is critical for evaluating mangrove blue carbon capability. In this study, potential effects of SLR on the GHG emissions were quantified through static closed chamber technique among three sites under different intertidal elevations, representing tidal flooding situation of SLR values of 0 cm, 40 cm and 80 cm, respectively. Compared with Site SLR 0 cm, annual CO2 and N2O fluxes decreased by approximately 75.0% and 27.3% due to higher soil water content, lower salinity and soil nutrient environments at Site SLR 80 cm. However, CH4 fluxes increased by approximately 13.7% at Site SLR 40 cm and 8.8% at Site SLR 80 cm because of lower salinity, higher soil water content and soil pH. CO2-equivalent fluxes were 396.61 g/(m2·a), 1423.29 g/(m2·a) and 1420.21 g/(m2·a) at Sites SLR 80 cm, SLR 40 cm and SLR 0 cm, respectively. From Site SLR 0 cm to Site SLR 80 cm, contribution rate of N2O and CH4 increased by approximately 7.42% and 3.02%, while contribution rate of CO2 decreased by approximately 10.44%. The results indicated that warming potential of trace CH4 and N2O was non-negligible with SLR. Potential effects of SLR on the mangrove blue carbon capability should warrant attention due to changes of all three greenhouse gas fluxes with SLR.
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