Leaf-level photosynthetic capacity in lowland Amazonian and high-1 elevation, Andean tropical moist forests of Peru
Bahar, Nur H. A. (Australian National University. Research School of Biology)
Yoko Ishida, F. (James Cook University of North Queensland. College of Marine and Environmental Sciences)
Weerasinghe, Lasantha K. (Australian National University. Research School of Biology)
Guerrieri, Rossella (University of Edinburgh. School of Geosciences)
O'Sullivan, Odhran S. (Australian National University. Research School of Biology)
Bloomfield, Keith J. (Australian National University. Research School of Biology)
Asner, Gregory P. (Carnegie Institution for Science (Washington, Estats Units d'Amèrica))
Martin, Roberta (Carnegie Institution for Science (Washington, Estats Units d'Amèrica))
Lloyd, Jonathan (James Cook University of North Queensland. College of Marine and Environmental Sciences)
Malhi, Yadvinder (University of Oxford. School of Geography and the Environment)
Phil, Oliver L. (University of Leeds. School of Geography)
Meir, Patrick (Australian National University. Research School of Biology)
Salinas, Norma (University of Oxford. School of Geography and the Environment)
Cosio, Eric G. (Pontificia Universidad Católica del Perú. Sección Química)
Domingues, Tomas (Universidade de São Paulo, Faculdade de Filosofia Ciências e Letras)
Quesada, Carlos A. (Instituto Nacional de Pesquisas da Amazonia)
Sinca, Felipe (Carnegie Institution for Science (Washington, Estats Units d'Amèrica))
Escudero Vega, Alberto (Pontificia Universidad Católica del Perú. Sección Química)
Zuloaga Ccorimanya, Paola P. (Universidad Nacional de San Antonio Abad del Cusco. Sección Biología)
Del Aguila Pasquel, Jhon (Instituto de Investigaciones de la Amazonía Peruana)
Quispe Huaypar, Katherine (Pontificia Universidad Católica del Perú. Sección Química)
Cuba Torres, Israel (Pontificia Universidad Católica del Perú. Sección Química)
Butrón Loayza, Rosalbina (Universidad Nacional de San Antonio Abad del Cusco. Museo de Historia Natural)
Pelaez Tapia, Yulina (Pontificia Universidad Católica del Perú. Sección Química)
Huaman Ovalle, Judit (Pontificia Universidad Católica del Perú. Sección Química)
Long, Benedict M. (Australian National University. Research School of Biology)
Evans, John R. (Australian National University. Research School of Biology)
Atkin, Owen K. (Australian National University. Research School of Biology)

Date:	2017
Abstract:	We examined whether variations in photosynthetic capacity are linked to variations in the environment and/or associated leaf traits for tropical moist forests (TMFs) in the Andes/western Amazon regions of Peru. We compared photosynthetic capacity (maximal rate of carboxylation of Rubisco (Vcmax), and the maximum rate of electron transport (Jmax)), leaf mass, nitrogen (N) and phosphorus (P) per unit leaf area (Ma, Na and Pa, respectively), and chlorophyll from 210 species at 18 field sites along a 3300-m elevation gradient. Western blots were used to quantify the abundance of the CO2-fixing enzyme Rubisco. Area- and N-based rates of photosynthetic capacity at 25°C were higher in upland than lowland TMFs, underpinned by greater investment of N in photosynthesis in high-elevation trees. Soil [P] and leaf Pa were key explanatory factors for models of area-based Vcmax and Jmax but did not account for variations in photosynthetic N-use efficiency. At any given Na and Pa, the fraction of N allocated to photosynthesis was higher in upland than lowland species. For a small subset of lowland TMF trees examined, a substantial fraction of Rubisco was inactive. These results highlight the importance of soil- and leaf-P in defining the photosynthetic capacity of TMFs, with variations in N allocation and Rubisco activation state further influencing photosynthetic rates and N-use efficiency of these critically important forests.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Elevation ; Carboxylation capacity ; Leaf traits ; Nitrogen ; Phosphorus ; Ribulose bisphosphate regeneration ; Temperature ; Tropical forests
Published in:	The new phytologist, Vol. 214, issue 3 (May 2017) , p. 1002-1018, ISSN 1469-8137

DOI: 10.1111/nph.14079

Post-print 78 p, 4.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles