Carbon balance of a tropical savanna of northern Australia

  • Chen X
  • Hutley L
  • Eamus D
  • 1

    Readers

    Mendeley users who have this article in their library.
  • N/A

    Citations

    Citations of this 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.

Author-supplied keywords

  • carbon cycling
  • carbon source-sink relationships
  • co 2
  • net ecosystem
  • wet-dry tropics

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Xiaoyong Chen

  • LB Hutley

  • Derek Eamus

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free