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| Titel |
The relationships between termite mound CH4/CO2 emissions and internal concentration ratios are species specific |
| VerfasserIn |
H. Jamali, S. J. Livesley, L. B. Hutley, B. Fest, S. K. Arndt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 4 ; Nr. 10, no. 4 (2013-04-05), S.2229-2240 |
| Datensatznummer |
250018181
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| Publikation (Nr.) |
 copernicus.org/bg-10-2229-2013.pdf |
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| Zusammenfassung |
| We investigated the relative importance of CH4 and CO2 fluxes from
soil and termite mounds at four different sites in the tropical savannas of
northern Australia near Darwin and assessed different methods to indirectly
predict CH4 fluxes based on CO2 fluxes and internal gas
concentrations.
The annual flux from termite mounds and surrounding soil was dominated by
CO2 with large variations among sites. On a carbon dioxide equivalent (CO2-e) basis, annual
CH4 flux estimates from termite mounds were 5- to 46-fold smaller than
the concurrent annual CO2 flux estimates. Differences between annual
soil CO2 and soil CH4 (CO2-e) fluxes were even greater, soil
CO2 fluxes being almost three orders of magnitude greater than soil
CH4 (CO2-e) fluxes at site. The contribution of CH4 and
CO2 emissions from termite mounds to the total CH4 and CO2
emissions from termite mounds and soil in CO2-e was less than 1%.
There were significant relationships between mound CH4 flux and mound
CO2 flux, enabling the prediction of CH4 flux from measured
CO2 flux; however, these relationships were clearly termite species
specific.
We also observed significant relationships between mound flux and gas
concentration inside mound, for both CH4 and CO2, and for all
termite species, thereby enabling the prediction of flux from measured mound
internal gas concentration. However, these relationships were also termite
species specific. Using the relationship between mound internal gas
concentration and flux from one species to predict mound fluxes from other
termite species (as has been done in the past) would result in errors of more
than 5-fold for mound CH4 flux and 3-fold for mound CO2 flux.
This study highlights that CO2 fluxes from termite mounds are generally
more than one order of magnitude greater than CH4 fluxes. There are
species-specific relationships between CH4 and CO2 fluxes from a
mound, and between the inside mound concentration of a gas and the mound
flux emission of the same gas, but these relationships vary greatly among
termite species. Thus, there is no generic relationship that will
allow for the accurate prediction of CH4 fluxes from termite mounds of
all species, but given the data limitations, the above methods may still be used with caution. |
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