Impact of Nutrient Additions on Free-Living Nitrogen Fixation in Litter and Soil of Two French-Guianese Lowland Tropical Forests

0544803 - ÚVGZ 2022 RIV US eng J - Článek v odborném periodiku
Van Langenhove, L. - Depaepe, T. - Verryckt, L. T. - Vallicrosa, H. - Fuchslueger, L. - Lugli, L. F. - Brechet, L. - Ogaya, R. - Llusia, J. - Urbina, I. - Gargallo-Garriga, Albert - Grau, O. - Richter, A. - Penuelas, J. - Van Der Straeten, D. - Janssens, I. A.
Impact of Nutrient Additions on Free-Living Nitrogen Fixation in Litter and Soil of Two French-Guianese Lowland Tropical Forests.
Journal of Geophysical Research-Biogeosciences. Roč. 126, č. 7 (2021), č. článku e2020JG006023. ISSN 2169-8953. E-ISSN 2169-8961
Grant CEP: GA MŠMT(CZ) EF16_027/0008137
Výzkumná infrastruktura: CzeCOS III - 90123
Institucionální podpora: RVO:86652079
Klíčová slova: acetylene-reduction * n-2 fixation * rain-forest * leaf-litter * phosphorus * molybdenum * limitation * carbon * heterogeneity * potassium * phosphorus * molybdenum * feld fertilization * cross-site comparison * acetylene reduction assay * N-15(2) calibration
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 4.432, rok: 2021
Způsob publikování: Omezený přístup
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JG006023

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.
Trvalý link: http://hdl.handle.net/11104/0321610