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Título: | Leaf-level photosynthetic capacity in lowland Amazonian and high-elevation Andean tropical moist forests of Peru |
Autor: | Bahar, Nur H.A. Ishida, Francoise Yoko Weerasinghe, Lasantha K. Guerrieri, Rossella O'Sullivan, Odhran S. Bloomfield, Keith J. Asner, Gregory P. Martin, Roberta E. Lloyd, Jon Malhi, Yadvinder Singh Phillips, Oliver L. Meir, Patrick W. Salinas, Norma Cosio, Eric G. null, Tomas Quesada, Carlos Alberto Sinca, Felipe Escudero Vega, Alberto Zuloaga Ccorimanya, Paola P. Del Águila Pasquel, Jhon Quispe Huaypar, Katherine Cuba-Torres, Israel Butrón Loayza, Rosalbina Pelaez-Tapia, Yulina Huamán-Ovalle, Judit Long, Benedict M. Evans, John R. Atkin, Owen K. |
Palavras-chave: | Abundance Carbon Dioxide Carboxylic Acid Elevation Enzyme Activity Forest Ecosystem Leaf Area Moisture Content Nitrogen Phosphorus Photosynthesis Temperature Effect Tropical Forest Amazonas Andes Peru Carbon Dioxide Nitrogen Ribulose-bisphosphate Carboxylase Altitude Anatomy And Histology Biological Model Chemistry Enzyme Assay Forest Humidity Kinetics Metabolism Peru Photosynthesis Physiology Plant Leaf Species Difference Temperature Tropic Climate Altitude Carbon Dioxide Enzyme Assays Forests Humidity Kinetics Models, Biological Nitrogen Peru Photosynthesis Plant Leaves Ribulose-bisphosphate Carboxylase Species Specificity Temperature Tropical Climate |
Data do documento: | 2017 |
Revista: | New Phytologist |
É parte de: | Volume 214, Número 3, Pags. 1002-1018 |
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. © 2016 The Authors. New Phytologist © 2016 New Phytologist Trust |
DOI: | 10.1111/nph.14079 |
Aparece nas coleções: | Artigos |
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