Univ. of Antwerp, Wilrijk (Belgium); Université de Guyane (French Guiana)
Univ. of Antwerp, Wilrijk (Belgium)
Univ. of Vienna (Austria); International Inst. of Applied Systems Analysis (IIASA), Laxenburg (Austria)
Consejo Superior de Investigaciones Cientificas (CSIC), Catalonia (Spain); Centre de Recerca Ecològica i Aplicacions Forestals (CREAF), Catalonia (Spain)
The spatial variation of soil greenhouse gas fluxes (GHG; carbon dioxide—CO2, methane—CH4 and nitrous oxide—N2O) remains poorly understood in highly complex ecosystems such as tropical forests. Here, we used 240 individual flux measurements of these three GHGs from different soil types, at three topographical positions and in two extreme hydric conditions in the tropical forests of the Guiana Shield (French Guiana, South America) to (1) test the effect of topographical positions on GHG fluxes and (2) identify the soil characteristics driving flux variation in these nutrient-poor tropical soils. Surprisingly, none of the three GHG flux rates differed with topographical position. CO2 effluxes covaried with soil pH, soil water content (SWC), available nitrogen and total phosphorus. The CH4 fluxes were best explained by variation in SWC, with soils acting as a sink under drier conditions and as a source under wetter conditions. Unexpectedly, our study areas were generally sinks for N2O and N2O fluxes were partly explained by total phosphorus and available nitrogen concentrations. This initial work describing the spatial variation of soil fluxes of the three main GHGs measured simultaneously in forests of the Guiana Shield lays the foundation for specific studies of the processes underlying the observed patterns.
Courtois, Elodie A., et al. "Spatial Variation of Soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield." Ecosystems, vol. 21, no. 7, Feb. 2018. https://doi.org/10.1007/s10021-018-0232-6
Courtois, Elodie A., Stahl, Clément, Van den Berge, Joke, Bréchet, Laëtitia, Van Langenhove, Leandro, Richter, Andreas, Urbina, Ifigenia, Soong, Jennifer L., Peñuelas, Josep, & Janssens, Ivan A. (2018). Spatial Variation of Soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield. Ecosystems, 21(7). https://doi.org/10.1007/s10021-018-0232-6
Courtois, Elodie A., Stahl, Clément, Van den Berge, Joke, et al., "Spatial Variation of Soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield," Ecosystems 21, no. 7 (2018), https://doi.org/10.1007/s10021-018-0232-6
@article{osti_1567141,
author = {Courtois, Elodie A. and Stahl, Clément and Van den Berge, Joke and Bréchet, Laëtitia and Van Langenhove, Leandro and Richter, Andreas and Urbina, Ifigenia and Soong, Jennifer L. and Peñuelas, Josep and Janssens, Ivan A.},
title = {Spatial Variation of Soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield},
annote = {The spatial variation of soil greenhouse gas fluxes (GHG; carbon dioxide—CO2, methane—CH4 and nitrous oxide—N2O) remains poorly understood in highly complex ecosystems such as tropical forests. Here, we used 240 individual flux measurements of these three GHGs from different soil types, at three topographical positions and in two extreme hydric conditions in the tropical forests of the Guiana Shield (French Guiana, South America) to (1) test the effect of topographical positions on GHG fluxes and (2) identify the soil characteristics driving flux variation in these nutrient-poor tropical soils. Surprisingly, none of the three GHG flux rates differed with topographical position. CO2 effluxes covaried with soil pH, soil water content (SWC), available nitrogen and total phosphorus. The CH4 fluxes were best explained by variation in SWC, with soils acting as a sink under drier conditions and as a source under wetter conditions. Unexpectedly, our study areas were generally sinks for N2O and N2O fluxes were partly explained by total phosphorus and available nitrogen concentrations. This initial work describing the spatial variation of soil fluxes of the three main GHGs measured simultaneously in forests of the Guiana Shield lays the foundation for specific studies of the processes underlying the observed patterns.},
doi = {10.1007/s10021-018-0232-6},
url = {https://www.osti.gov/biblio/1567141},
journal = {Ecosystems},
issn = {ISSN 1432-9840},
number = {7},
volume = {21},
place = {United States},
publisher = {Springer},
year = {2018},
month = {02}}
