Spatial variation of soil CO₂, CH₄ and N₂O fluxes across 1 topographical positions in tropical forests of the Guiana Shield
Courtois, Elodie A. (Universiteit Antwerpen. Departement Biologie)
Stahl, Clément (Universiteit Antwerpen. Departement Biologie)
Berge, Joke Van den (Universiteit Antwerpen. Departement Biologie)
Bréchet, Laëtitia (Universiteit Antwerpen. Departement Biologie)
Van Langenhove, Leandro (Universiteit Antwerpen. Departement Biologie)
Richter, Andreas (Universität Wien. Institut für Mikrobiologie und Ecosystem Wissenschaf)
Urbina Barreto, Ifigenia (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Soong, Jennifer L. (Universiteit Antwerpen. Departement Biologie)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Janssens, Ivan (Universiteit Antwerpen. Departement Biologie)

Data:	2018
Resum:	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. 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 first study 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.
Ajuts:	European Commission 610028
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Ecosystems, Vol. 21, issue 7 (Nov. 2018) , p. 1445-1458, ISSN 1435-0629

DOI: 10.1007/s10021-018-0232-6

Post-print 41 p, 2.1 MB

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