Impact of nutrient additions on free-living nitrogen fixation in litter and soil of two French-Guianese lowland ropical forests
Van Langenhove, Leandro (University of Antwerp. Department of Biology)
Depaepe, Thomas (Ghent University. Department of Biology)
Verryckt, Lore (University of Antwerp. Department of Biology)
Vallicrosa Pou, Helena (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Fuchslueger, Lucia (University of Antwerp. Department of Biology)
Figueiredo Lugli, Laynara (Instituto Nacional de Pesquisas da Amazônia)
Bréchet, Laëtitia (University of Antwerp. Department of Biology)
Ogaya Inurrigarro, Romà (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Llusia, Joan (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Urbina Barreto, Ifigenia (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Gargallo-Garriga, Albert (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Grau Fernández, Oriol (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Richter, Andreas (University of Vienna. Department of Microbiology and Ecosystem Science)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
van Der Straeten, Dominique (Ghent University. Department of Biology)
Janssens, Ivan (University of Antwerp. Department of Biology)

Data:	2021
Resum:	In tropical forests, free-living Biological nitrogen (N) fixation (BNF) in soil and littertends to decrease when substrate N concentrations increase, whereas increasing phosphorus (P) andmolybdenum (Mo) soil and litter concentrations have been shown to stimulate free-living BNF rates. Yet,very few studies explored the effects of adding N, P, and Mo together in a single large-scale fertilizationexperiment, which would teach us which of these elements constrain or limit BNF activities. At twodistinct forest sites in French Guiana, we performed a 3-year in situ nutrient addition study to explorethe effects of N, P, and Mo additions on leaf litter and soil BNF. Additionally, we conducted a short-term laboratory study with the same nutrient addition treatments (+N, +N+P, +P, +Mo, and +P+Mo). We found that N additions alone suppressed litter free-living BNF in the field, but not in the short-term laboratory study, while litter free-living BNF remained unchanged in response to N+P additions. Additionally, we found that P and P+Mo additions stimulated BNF in leaf litter, both in the field and inthe lab, while Mo alone yielded no changes. Soil BNF increased with P and P+Mo additions in only one ofthe field sites, while in the other site soil BNF increased with Mo and P+Mo additions. We concluded thatincreased substrate N concentrations suppress BNF. Moreover, both P and Mo have the potential to limitfree-living BNF in these tropical forests, but the balance between P versus Mo limitation is determined bysite-specific characteristics of nutrient supply and demand.
Ajuts:	European Commission 610028
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Phosphorus ; Molybdenum ; Feld fertilization ; Cross-site comparison ; Acetylene reduction assay ; 15N2 calibration
Publicat a:	Journal of geophysical research. Biogeosciences, Vol 126, issue 7 (July 2021) , art. #e2020JG006023, ISSN 2169-8961

DOI: 10.1029/2020JG006023

15 p, 440.6 KB

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