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Seasonality, drivers, and isotopic composition of soil CO2 fluxes from tropical forests of the Congo Basin

Simon Baumgartner, Matti Barthel, Travis William Drake, Marijn Bauters (UGent) , Isaac Ahanamungu Makelele (UGent) , John Kalume Mugula, Laura Summerauer, Nora Gallarotti, Landry Cizungu Ntaboba, Kristof Van Oost, et al.
(2020) BIOGEOSCIENCES. 17(23). p.6207-6218
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Abstract
Soil respiration is an important carbon flux and key process determining the net ecosystem production of terrestrial ecosystems. To address the lack of quantification and understanding of seasonality in soil respiration of tropical forests in the Congo Basin, soil CO2 fluxes and potential controlling factors were measured annually in two dominant forest types (lowland and montane) of the Congo Basin over 2 years at varying temporal resolution. Soil CO2 fluxes from the Congo Basin resulted in 3.45 +/- 1.14 and 3.13 +/- 1.22 mu mol CO2 m(-2) s(-1) for lowland and montane forests, respectively. Soil CO2 fluxes in montane forest soils showed a clear seasonality with decreasing flux rates during the dry season. Montane forest soil CO2 fluxes were positively correlated with soil moisture, while CO2 fluxes in the lowland forest were not. Smaller differences of delta C-1(3) values of leaf litter, soil organic carbon (SOC), and soil CO2 indicated that SOC in lowland forests is more decomposed than in montane forests, suggesting that respiration is controlled by C availability rather than environmental factors. In general, C in montane forests was more enriched in C-13 throughout the whole cascade of carbon intake via photosynthesis, litterfall, SOC, and soil CO2 compared to lowland forests, pointing to a more open system. Even though soil CO2 fluxes are similarly high in lowland and montane forests of the Congo Basin, the drivers of them seem to be different, i.e., soil moisture for montane forest and C availability for lowland forest.
Keywords
cavelab, AMAZONIAN RAIN-FOREST, CARBON-DIOXIDE, HETEROTROPHIC RESPIRATION, NITROUS-OXIDE, ECOSYSTEM RESPIRATION, VEGETATION TYPES, MOUNTAIN FOREST, CLIMATE-CHANGE, AIR SAMPLES, LAND-USE

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MLA
Baumgartner, Simon, et al. “Seasonality, Drivers, and Isotopic Composition of Soil CO2 Fluxes from Tropical Forests of the Congo Basin.” BIOGEOSCIENCES, vol. 17, no. 23, 2020, pp. 6207–18, doi:10.5194/bg-17-6207-2020.
APA
Baumgartner, S., Barthel, M., Drake, T. W., Bauters, M., Ahanamungu Makelele, I., Mugula, J. K., … Six, J. (2020). Seasonality, drivers, and isotopic composition of soil CO2 fluxes from tropical forests of the Congo Basin. BIOGEOSCIENCES, 17(23), 6207–6218. https://doi.org/10.5194/bg-17-6207-2020
Chicago author-date
Baumgartner, Simon, Matti Barthel, Travis William Drake, Marijn Bauters, Isaac Ahanamungu Makelele, John Kalume Mugula, Laura Summerauer, et al. 2020. “Seasonality, Drivers, and Isotopic Composition of Soil CO2 Fluxes from Tropical Forests of the Congo Basin.” BIOGEOSCIENCES 17 (23): 6207–18. https://doi.org/10.5194/bg-17-6207-2020.
Chicago author-date (all authors)
Baumgartner, Simon, Matti Barthel, Travis William Drake, Marijn Bauters, Isaac Ahanamungu Makelele, John Kalume Mugula, Laura Summerauer, Nora Gallarotti, Landry Cizungu Ntaboba, Kristof Van Oost, Pascal Boeckx, Sebastian Doetterl, Roland Anton Werner, and Johan Six. 2020. “Seasonality, Drivers, and Isotopic Composition of Soil CO2 Fluxes from Tropical Forests of the Congo Basin.” BIOGEOSCIENCES 17 (23): 6207–6218. doi:10.5194/bg-17-6207-2020.
Vancouver
1.
Baumgartner S, Barthel M, Drake TW, Bauters M, Ahanamungu Makelele I, Mugula JK, et al. Seasonality, drivers, and isotopic composition of soil CO2 fluxes from tropical forests of the Congo Basin. BIOGEOSCIENCES. 2020;17(23):6207–18.
IEEE
[1]
S. Baumgartner et al., “Seasonality, drivers, and isotopic composition of soil CO2 fluxes from tropical forests of the Congo Basin,” BIOGEOSCIENCES, vol. 17, no. 23, pp. 6207–6218, 2020.
@article{8688123,
  abstract     = {{Soil respiration is an important carbon flux and key process determining the net ecosystem production of terrestrial ecosystems. To address the lack of quantification and understanding of seasonality in soil respiration of tropical forests in the Congo Basin, soil CO2 fluxes and potential controlling factors were measured annually in two dominant forest types (lowland and montane) of the Congo Basin over 2 years at varying temporal resolution. Soil CO2 fluxes from the Congo Basin resulted in 3.45 +/- 1.14 and 3.13 +/- 1.22 mu mol CO2 m(-2) s(-1) for lowland and montane forests, respectively. Soil CO2 fluxes in montane forest soils showed a clear seasonality with decreasing flux rates during the dry season. Montane forest soil CO2 fluxes were positively correlated with soil moisture, while CO2 fluxes in the lowland forest were not. Smaller differences of delta C-1(3) values of leaf litter, soil organic carbon (SOC), and soil CO2 indicated that SOC in lowland forests is more decomposed than in montane forests, suggesting that respiration is controlled by C availability rather than environmental factors. In general, C in montane forests was more enriched in C-13 throughout the whole cascade of carbon intake via photosynthesis, litterfall, SOC, and soil CO2 compared to lowland forests, pointing to a more open system. Even though soil CO2 fluxes are similarly high in lowland and montane forests of the Congo Basin, the drivers of them seem to be different, i.e., soil moisture for montane forest and C availability for lowland forest.}},
  author       = {{Baumgartner, Simon and Barthel, Matti and Drake, Travis William and Bauters, Marijn and Ahanamungu Makelele, Isaac and Mugula, John Kalume and Summerauer, Laura and Gallarotti, Nora and Cizungu Ntaboba, Landry and Van Oost, Kristof and Boeckx, Pascal and Doetterl, Sebastian and Werner, Roland Anton and Six, Johan}},
  issn         = {{1726-4170}},
  journal      = {{BIOGEOSCIENCES}},
  keywords     = {{cavelab,AMAZONIAN RAIN-FOREST,CARBON-DIOXIDE,HETEROTROPHIC RESPIRATION,NITROUS-OXIDE,ECOSYSTEM RESPIRATION,VEGETATION TYPES,MOUNTAIN FOREST,CLIMATE-CHANGE,AIR SAMPLES,LAND-USE}},
  language     = {{eng}},
  number       = {{23}},
  pages        = {{6207--6218}},
  title        = {{Seasonality, drivers, and isotopic composition of soil CO2 fluxes from tropical forests of the Congo Basin}},
  url          = {{http://doi.org/10.5194/bg-17-6207-2020}},
  volume       = {{17}},
  year         = {{2020}},
}
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