Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/37999
Título: Impact of Nutrient Additions on Free-Living Nitrogen Fixation in Litter and Soil of Two French-Guianese Lowland Tropical Forests
Autor: Langenhove, Leandro van
Depaepe, Thomas
Verryckt, Lore T.
Vallicrosa, Helena
Fuchslueger, Lucia
Lugli, Laynara F.
Bréchet, Laëtitia M.
Ogaya, Romà
Llusiá, Joan
Urbina, Ifigenia
Gargallo-Garriga, Albert
Grau, Oriol
Richter, Andreas A.
Penuelas, Josep
Van Der Straeten, Dominique
Janssens, Ivan A.
Palavras-chave: 15N2 calibration
acetylene reduction assay
cross-site comparison
feld fertilization
molybdenum
phosphorus
Data do documento: 2021
Revista: Journal of Geophysical Research: Biogeosciences
É parte de: Volume 126, Número 126
Abstract: In tropical forests, free-living Biological nitrogen (N) fixation (BNF) in soil and litter tends to decrease when substrate N concentrations increase, whereas increasing phosphorus (P) and molybdenum (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 fertilization experiment, which would teach us which of these elements constrain or limit BNF activities. At two distinct forest sites in French Guiana, we performed a 3-year in situ nutrient addition study to explore the 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 in the lab, while Mo alone yielded no changes. Soil BNF increased with P and P+Mo additions in only one of the field sites, while in the other site soil BNF increased with Mo and P+Mo additions. We concluded that increased substrate N concentrations suppress BNF. Moreover, both P and Mo have the potential to limit free-living BNF in these tropical forests, but the balance between P versus Mo limitation is determined by site-specific characteristics of nutrient supply and demand. © 2021. American Geophysical Union. All Rights Reserved.
DOI: 10.1029/2020JG006023
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