@Article{VanLangenhove_etal2021,
author="Van Langenhove, Leandro
and Depaepe, Thomas
and Verryckt, Lore T.
and Vallicrosa, Helena
and Fuchslueger, Lucia
and Lugli, Laynara F.
and Br{\'e}chet, La{\"e}titia M.
and Ogaya, Roma
and Llusia, Joan
and Urbina, Ifigenia
and Gargallo-Garriga, Albert
and Grau, Oriol
and Richter, Andreas
and Penuelas, Josep
and Van Der Straeten, Dominique
and August Janssens, Ivan A.",
title="Impact of Nutrient Additions on Free-Living Nitrogen Fixation in Litter and Soil of Two French-Guianese Lowland Tropical Forests",
journal="JGR Biogeosciences",
year="2021",
publisher="American Geophysical Union",
volume="126",
number="7",
pages="e2020JG006023",
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.",
optnote="exported from refbase (http://php.ecofog.gf/refbase/show.php?record=1040), last updated on Wed, 20 Jul 2022 13:24:02 -0300",
doi="10.1029/2020JG006023"
}