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- Title
Spatial and temporal variation of CO<sub>2</sub> efflux along a disturbance gradient in a miombo woodland in Western Zambia.
- Authors
Merbold, L.; Ziegler, W.; Mukelabai, M. M.; Kutsch, W. L.
- Abstract
Carbon dioxide efflux from the soil surface was measured over a period of several weeks within a heterogeneous Brachystegia spp. dominated miombo woodland in Western Zambia. The objectives were to examine spatial and temporal variation of soil respiration along a disturbance gradient from a protected forest reserve to a cut, burned, and grazed area outside, and to relate the flux to various abiotic and biotic drivers. The highest daily mean fluxes (around 12 µmol CO2 m-2 s-1) were measured in the protected forest in the wet season and lowest daily mean fluxes (around 1 µmol CO2 m-2 s-1) in the most disturbed area during the dry season. Diurnal variation of soil respiration was closely correlated with soil temperature. The combination of soil water content and soil temperature was found to be the main driving factor at seasonal time scale. There was a 75% decrease in soil CO2 efflux during the dry season and a 20% difference in peak soil respiratory flux measured in 2008 and 2009. Spatial variation of CO2 efflux was positively related to total soil carbon content in the undisturbed area but not at the disturbed site. Coefficients of variation of efflux rates between plots decreased towards the core zone of the protected forest reserve. Normalized soil respiration values did not vary significantly along the disturbance gradient. Spatial variation of respiration did not show a clear distinction between the disturbed and undisturbed sites and could not be explained by variables such as leaf area index. In contrast, within plot variability of soil respiration was explained by soil organic carbon content.
- Subjects
ZAMBIA; SPATIAL variation; CARBON dioxide &; the environment; MIOMBO; SOIL chemistry; BRACHYSTEGIA; SOIL respiration; FOREST reserves
- Publication
Biogeosciences, 2011, Vol 8, Issue 1, p147
- ISSN
1726-4170
- Publication type
Article
- DOI
10.5194/bg-8-147-2011