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Seasonal patterns of soil carbon dioxide efflux from a wet-dry tropical savanna of northern Australia

Chen, Xiaoyong, Eamus, Derek and Hutley, Lindsay B. (2002). Seasonal patterns of soil carbon dioxide efflux from a wet-dry tropical savanna of northern Australia. Australian Journal of Botany,50(1):43-51.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 40 times in Scopus Article | Citations

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Title Seasonal patterns of soil carbon dioxide efflux from a wet-dry tropical savanna of northern Australia
Author Chen, Xiaoyong
Eamus, Derek
Hutley, Lindsay B.
Journal Name Australian Journal of Botany
Publication Date 2002
Volume Number 50
Issue Number 1
ISSN 0067-1924   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-0036120708
Start Page 43
End Page 51
Total Pages 9
Place of Publication Collingwood, Victoria, Australia
Publisher CSIRO Publishing
Field of Research 0607 - Plant Biology
HERDC Category C1 - Journal Article (DEST)
Abstract Soil CO2 efflux rates were measured in a eucalypt open forest in a tropical savanna of northern Australia, with a portable closed chamber and CO2 gas analyser. Both abiotic (soil temperature and water content) and biotic (litterfall and fine-root growth) factors that may influence soil CO2 efflux were examined. Daytime rates of soil CO2 efflux rate were consistently higher than nocturnal values. Maximal rates occurred during late afternoons when soil temperatures were also maximal and minimum values were recorded during the early morning (0400-0800 hours). Average soil CO2 efflux was 5.37 mol m(-2) s(-1) (range 3.5-6.7 mol m(-2) s(-1)) during the wet season and declined to 2.20 mol m(-2) s(-1) (range 1.2-3.6 mol m(-2) s(-1)) during the dry season. The amount of carbon released from soil was 14.3 t ha(-1) year(-1), with approximately 70% released during the wet season and 30% during the dry season. The rate of efflux was correlated with soil moisture content and soil temperature only during the wet season, when root growth and respiration were high. During the dry season there was no correlation with soil temperature. These results are discussed in relation to the carbon balance of tropical savannas.
Keywords co2 evolution
pine plantations
eddy covariance
french-guiana
respiration
forests
temperature
moisture
decomposition
atmosphere
DOI http://dx.doi.org/10.1071/BT01049   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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