TITLE

Carbon balance of a tropical savanna of northern Australia

AUTHOR(S)
Xiaoyong Chen; Hutley, Lindsay B.; Eamus, Derek
PUB. DATE
November 2003
SOURCE
Oecologia;Nov2003, Vol. 137 Issue 3, p405
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
16766895

 

Related Articles

  • Isotopes for Ecosystems. Weltzin, Jake F.; Williams, David G. // BioScience;Sep2003, Vol. 53 Issue 9, p795 

    Focuses on the role of terrestial ecosystem in modulating the balance uptake and release of carbon dioxide. Implication of industrial activity and changes for the carbon cycle; Incorporation of carbon into long-lived components; Sequestration of carbon from atmospheric carbon and of older ones.

  • Precipitation Regulates the Response of Net Ecosystem CO2 Exchange to Environmental Variation on United States Rangelands. Polley, H. Wayne; Emmerich, William; Bradford, James A.; Sims, Phillip L.; Johnson, Douglas A.; Saliendra, Nicanor Z.; Svejcar, Tony; Angell, Raymond; Frank, Albert B.; Phillips, Rebecca L.; Snyder, Keirith A.; Morgan, Jack A.; Sanabria, Joaquin; Mielnick, Patricia C.; Dugas, William A. // Rangeland Ecology & Management;Mar2010, Vol. 63 Issue 2, p176 

    Rangelands occupy 50% of Earth's land surface and thus are important in the terrestrial carbon (C) cycle. For rangelands and other terrestrial ecosystems, the balance between photosynthetic uptake of carbon dioxide (CO2) and CO2 loss to respiration varies among years in response to interannual...

  • Distinct patterns in the diurnal and seasonal variability in four components of soil respiration in a temperate forest under free-air CO2 enrichment. Taneva, L.; Gonzalez-Meler, M. A.; Knohl, A. // Biogeosciences;2011, Vol. 8 Issue 10, p3077 

    Soil respiration (RS) is a major flux in the global carbon (C) cycle. Responses of RS to changing environmental conditions may exert a strong control on the residence time of C in terrestrial ecosystems and in turn influence the atmospheric concentration of greenhouse gases. Soil respiration...

  • The carbon balance of terrestrial ecosystems in China. Piao, Shilong; Fang, Jingyun; Ciais, Philippe; Peylin, Philippe; Huang, Yao; Sitch, Stephen; Wang, Tao // Nature;4/23/2009, Vol. 458 Issue 7241, p1009 

    Global terrestrial ecosystems absorbed carbon at a rate of 1–4 Pg yr-1 during the 1980s and 1990s, offsetting 10–60 per cent of the fossil-fuel emissions. The regional patterns and causes of terrestrial carbon sources and sinks, however, remain uncertain. With increasing scientific...

  • Time lag between carbon dioxide influx to and efflux from bare saline-alkali soil detected by the explicit partitioning and reconciling of soil CO flux. Chen, Xi; Wang, Wen-Feng; Luo, Ge-Ping; Li, Long-Hui; Li, Yan // Stochastic Environmental Research & Risk Assessment;Mar2013, Vol. 27 Issue 3, p737 

    A recent publication demonstrated a non-biological CO absorption by saline-alkali soils ( A) at desert ecosystems. Still little is known about the mechanisms of A and it might be a hidden loop in the carbon cycle. Although it was separated after sterilization treatment on bare saline-alkali...

  • Hysteresis response of daytime net ecosystem CO2 exchange during a drought. Pingintha, N.; Leclerc, M. Y.; Beasley Jr., J. P.; Zhang, G.; Senthong, C.; Rowland, D. // Biogeosciences Discussions;2009, Vol. 6 Issue 6, p10707 

    Continuous measurements of net ecosystem CO2 exchange (NEE) using the eddycovariance method were made over an agricultural ecosystem in the southeastern US. During optimum environmental conditions, photosynthetically active radiation (PAR) was the primary climatic factor controlling daytime NEE,...

  • The carbon budget of terrestrial ecosystems in East Asia over the last two decades. Piao, S.; Ito, A.; Li, S.; Huang, Y.; Ciais, P.; Wang, X.; Peng, S.; Andres, R. J.; Fang, J.; Jeong, S.; Mao, J.; Mohammat, A.; Muraoka, H.; Nan, H.; Peng, C.; Peylin, P.; Shi, X.; Sitch, S.; Tao, S.; Tian, H. // Biogeosciences Discussions;2012, Vol. 9 Issue 3, p4025 

    This REgional Carbon Cycle Assessment and Processes regional study provides a synthesis of the carbon balance of terrestrial ecosystems in East Asia, a region comprised of China, Japan, North- and South-Korea, and Mongolia. We estimate the current terrestrial carbon balance of East Asia and its...

  • Competing roles of rising CO2 and climate change in the contemporary European carbon balance. Harrison, R.; Jones, C. // Biogeosciences Discussions;2007, Vol. 4 Issue 4, p2385 

    Natural ecosystems respond to, and may affect climate change through uptake and storage of atmospheric CO2. Here we use the land-surface and carbon cycle model JULES to simulate the contemporary European carbon balance and its sensitivity to rising CO2 and changes in climate. We find that the...

  • Short-term temperature impact on soil heterotrophic respiration in limed agricultural soil samples. Buysse, Pauline; Goffin, Stéphanie; Carnol, Monique; Malchair, Sandrine; Debacq, Alain; Longdoz, Bernard; Aubinet, Marc // Biogeochemistry;Mar2013, Vol. 112 Issue 1-3, p441 

    This study sought to investigate the hourly and daily timescale responses of soil CO fluxes to temperature in a limed agricultural soil. Observations from different incubation experiments were compared with the results of a model combining biotic (heterotrophic respiration) and abiotic...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics