The Effect of Catena Position on Greenhouse Gas Emissions from Dambo Located Termite (Odontotermes transvaalensis) Mounds from Central Zimbabwe

Nyamadzawo, G and Gotosa, J and Muvengwi, J and Wuta, M and Nyamangara, J and Nyamugafata, P and Smith, J L (2012) The Effect of Catena Position on Greenhouse Gas Emissions from Dambo Located Termite (Odontotermes transvaalensis) Mounds from Central Zimbabwe. Atmospheric and Climate Sciences, 2 (4). pp. 501-509. ISSN 2160-0422

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Abstract

Methane (CH4), carbon dioxide (CO2) and nitrous oxide (N2)O) are greenhouse gases (GHGs) which cause global warming. Natural sources of GHGs include wetlands and termites. Previous studies have quantified GHG emissions from upland termites and no study has reported GHG emissions from seasonal wetlands (dambo) located termite mounds. The objective of this study was to evaluate the effect of dambo catena position on termite mound distribution and GHG emissions. It was hypothesized that mound density and GHG emissions from Odontotermes transvaalensis mounds, vary with catena position. The evaluated catena positions were margin, mid-slope, lower slope and bottom. Mound density was significantly lower in the bottom when compared to the other catena positions. The mean GHG fluxes were 88 μg m2 hr-1, 0.78 mg m2 hr-1 and 1361 mg m2 hr-1 for N2) O, CH4 and CO2 respectively. Fluxes varied with catena position and were 0.48, 0.72, 1.35 and 0.79 mg m-2 hr-1 for CH4 , and 1173.7, 1440.7, 1798.7 and 922.8 mg m-2 hr-1 for CO2 in the margin, mid-slope, lower slope and the bottom catena position respectively. For N2) O, there were no significant differences between catena positions. It was concluded that dambo located Odontotermes transvaalensis termite mounds are an important source of GHGs, and emissions varied with catena position for CO2 and CH4.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Uncontrolled Keywords: Greenhouse Gas Emissions; Termites Mounds; Odontotermes transvaalensis; Dambos; Catena Position
Subjects: Others > Climate Change
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 07 Feb 2013 06:45
Last Modified: 07 Feb 2013 06:45
URI: http://oar.icrisat.org/id/eprint/6524
Official URL: http://dx.doi.org/10.4236/acs.2012.24044
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: We are grateful for funding given to the Department of Soil Science and Agricultural Engineering, University of Zimbabwe by IFS. We would like to thank the staff at the USDA-Agricultural Research Service Laboratory, at Wa- shington State University for gas sample analysis
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