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Carbon balance of a tropical savanna of northern Australia

Chen, Xiaoyong, Hutley, Lindsay B. and Eamus, Derek (2003). Carbon balance of a tropical savanna of northern Australia. Oecologia,137(3):405-416.

Document type: Journal Article
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Title Carbon balance of a tropical savanna of northern Australia
Author Chen, Xiaoyong
Hutley, Lindsay B.
Eamus, Derek
Journal Name Oecologia
Publication Date 2003
Volume Number 137
Issue Number 3
ISSN 1432-1939   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0242570609
Start Page 405
End Page 416
Total Pages 12
Place of Publication Germany
Publisher Springer Publishing Company
Field of Research 0602 - Ecology
0502 - Environmental Science and Management
HERDC Category C1 - Journal Article (DEST)
Abstract Through estimations of above- and below-ground standing biomass, annual biomass increment, fine root production and turnover, litterfall, canopy respiration and total soil CO2 efflux, a carbon balance on seasonal and yearly time-scales is developed for a Eucalypt open-forest savanna in northern Australia. This carbon balance is compared to estimates of carbon fluxes derived from eddy covariance measurements conducted at the same site. The total carbon (C) stock of the savanna was 204+/-53 ton C ha(-1), with approximately 84% below-ground and 16% above-ground. Soil organic carbon content (0-1 m) was 151+/-33 ton C ha(-1), accounting for about 74% of the total carbon content in the ecosystem. Vegetation biomass was 53+/-20 ton C ha(-1), 39% of which was found in the root component and 61% in above-ground components (trees, shrubs, grasses). Annual gross primary production was 20.8 ton C ha(-1), of which 27% occurred in above-ground components and 73% below-ground components. Net primary production was 11 ton C ha(-1) year(-1), of which 8.0 ton C ha(-1) (73%) was contributed by below-ground net primary production and 3.0 ton C ha(-1) (27%) by above-ground net primary production. Annual soil carbon efflux was 14.3 ton C ha(-1) year(-1). Approximately three-quarters of the carbon flux (above-ground, below-ground and total ecosystem) occur during the 5-6 months of the wet season. This savanna site is a carbon sink during the wet season, but becomes a weak source during the dry season. Annual net ecosystem production was 3.8 ton C ha(-1) year(-1).
Keywords co2
carbon cycling
wet-dry tropics
carbon source-sink relationships
net ecosystem production
net primary production
deciduous forest
root biomass
soil carbon
stomatal conductance
seasonal patterns
pine plantations
leaf phenology
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