Soil greenhouse gas fluxes in tropical mangrove forests and in land uses on deforested mangrove lands

Castillo, Jose Alan A. and Apan, Armando A. and Maraseni, Tek N. and Salmo, Severino G., III (2017) Soil greenhouse gas fluxes in tropical mangrove forests and in land uses on deforested mangrove lands. Catena, 159. pp. 60-69. ISSN 0341-8162

Abstract

Mangrove forests are important carbon sinks in the tropics, yet tropical mangrove deforestation and land use conversion still persists. Reporting of greenhouse gas (GHG) emissions from natural and anthropogenic sources in wetlands are important in regional and national emissions inventories. However, very few studies have been conducted to measure on the GHG fluxes in coastal wetlands, particularly in mangrove forest and non-forest land uses in deforested mangroves. We investigated the soil fluxes of CO2, CH4 and N2O in mangrove forest and non-forest land uses on deforested mangrove areas (i.e. abandoned aquaculture ponds, coconut plantations, abandoned salt ponds, and cleared mangroves) in the coasts of Honda Bay, Philippines. Results showed that the emissions of CO2 and CH4 were higher by 2.6 and 6.6 times in mangrove forests (110 and 0.6 kg CO2e ha − 1 day − 1, respectively) while N2O emissions were lower by 34 times compared to the average of non-forest land uses (1.3 kg CO2e ha − 1 day − 1). CH4 and N2O emissions accounted for 0.59% and 0.04% of the total emissions in mangrove forest as compared to 0.23% and 3.07% for non-forest land uses, respectively. Site-scale soil GHG flux distribution could be mapped with 75% to 83% accuracy using Ordinary Kriging. Unlike mangroves that can offset all GHG emissions through CO2 uptake from photosynthesis, the non-forest land uses cannot offset their emissions on-site as they are usually devoid of vegetation. Our results could be utilised in higher tier national GHG inventories, to refine regional and global estimates of GHG emissions in mangrove wetlands, and improve policy on coastal wetlands conservation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 17 Jan 2018 02:13
Last Modified: 03 May 2018 01:14
Uncontrolled Keywords: soil greenhouse gas fluxes; mangrove forest; non-forest land uses in deforested mangrove lands; geostatistics; coastal wetlands; Philippines
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050301 Carbon Sequestration Science
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960302 Climate Change Mitigation Strategies
D Environment > 96 Environment > 9614 Soils > 961401 Coastal and Estuarine Soils
Identification Number or DOI: 10.1016/j.catena.2017.08.005
URI: http://eprints.usq.edu.au/id/eprint/33329

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