Preprints
https://doi.org/10.5194/bg-2015-662
https://doi.org/10.5194/bg-2015-662
10 Feb 2016
 | 10 Feb 2016
Status: this preprint was under review for the journal BG but the revision was not accepted.

Soil greenhouse gases emissions reduce the benefit of mangrove plant to mitigating atmospheric warming effect

Guangcheng Chen, Bin Chen, Dan Yu, Yong Ye, Nora F. Y. Tam, and Shunyang Chen

Abstract. Mangrove soils have been recognized as sources of atmospheric greenhouse gases but the atmospheric fluxes are poorly characterized, and their adverse warming effect has scarcely been considered with respect to the role of mangrove wetlands in mitigating global warming. The present study balanced the warming effect of soil greenhouse gas emissions with plant carbon dioxide (CO2) sequestration rate in a highly productive mangrove wetland in South China to assess the role of mangrove wetland in mitigating atmospheric warming. The results showed that mangrove soils were significant sources of greenhouse gases, and the fluxes were significantly higher in summer and also different among mangrove sites. Gases fluxes were positively correlated with the soil organic carbon, total nitrogen, and NH4+-N contents. The mangrove plant was able to sequester a considerable amount of atmospheric CO2 at 5930 g CO2 m−2 yr−1 in the present study, and the ecosystem was source of methane (CH4) and nitrous oxide (N2O) gases but more intense CO2 sink. However, the warming effect of soil gas emissions, equivalent to 1222 g CO2 m−2 yr−1, was able to offset a large proportion (~22 %) of plant CO2 sequestration, and the two trace gases comprised ~24 % of the total warming effect. We therefore propose the assessment of the direct mitigation of atmospheric warming by mangrove ecosystem that should take into account both soil greenhouse gases emissions and plant CO2 sequestration.

Guangcheng Chen, Bin Chen, Dan Yu, Yong Ye, Nora F. Y. Tam, and Shunyang Chen
 
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Status: closed
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Guangcheng Chen, Bin Chen, Dan Yu, Yong Ye, Nora F. Y. Tam, and Shunyang Chen
Guangcheng Chen, Bin Chen, Dan Yu, Yong Ye, Nora F. Y. Tam, and Shunyang Chen

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Short summary
Up to now, the adverse warming effect of soil greenhouse gas (GHG) emissions has scarcely been considered with respect to the role of mangrove wetlands in mitigating global warming. Our study showed that the warming effect of soil GHG emission would largely offset the benefit of plant CO2 sequestration, and we propose the assessment of the direct mitigation of atmospheric warming by mangrove ecosystem that should take into account both soil greenhouse gas emissions and plant CO2 sequestration.
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