Within-stand and seasonal variations of specific leaf area in a clonal Eucalyptus plantation in the Republic of Congo |
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| Authors: | Yann Nouvellon Jean-Paul Laclau Daniel Epron Antoine Kinana André Mabiala Olivier Roupsard Jean-Marc Bonnefond Guerric le Maire Claire Marsden Jean-Daniel Bontemps Laurent Saint-André |
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| Institution: | 1. CIRAD, Persyst, UPR80, TA10/D, 34398, Montpellier Cedex 5, France;2. UR2PI, BP 1291, Pointe-Noire, People''s Republic of Congo;3. USP, ESALQ, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil;4. Nancy Université, Université Henri Poincaré, UMR1137 Ecologie et Ecophysiologie Forestières, BP 239, F-54506, Vandoeuvre les Nancy, France;5. INRA, UMR1137 Ecologie et Ecophysiologie Forestières, F-54280, Champenoux, France;6. CATIE, 7170, Turrialba, Costa Rica;7. INRA, UR1263 EPHYSE, F-33140, Villenave d’Ornon, France;8. AgroParisTech, ENGREF, 14 rue Girardet, F-54000, Nancy, France;1. School of Forestry, Northern Arizona University, Flagstaff, AZ 86011, USA;2. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden;3. Federal University of Santa Catarina – UFSC, 89.520-000 Curitibanos, SC, Brazil;4. Instituto de Pesquisas e Estudos Florestais, Via Comendador Pedro Morganti, 3500 - Bairro Monte Alegre, Brazil;5. Department of Forest Sciences, University of São Paulo, 13400 Piracicaba, SP, Brazil;6. Department of Forest Science, São Paulo State University, 18600 Botucatu, SP, Brazil;1. University of São Paulo, ‘Luiz de Queiroz’ College of Agriculture, Department of Forest Science, Piracicaba, Brazil;2. Suzano Pulp and Paper S.A., Itapetininga, SP, Brazil;3. Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural – Incaper, Venda Nova do Imigrante, Brazil;4. Asia Pulp and Paper, Perawang, Indonesia;5. 4tree Agroflorestal, Piracicaba, Brazil;6. Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil;7. Fibria, Jacareí, Brazil;1. USP, Universidade de São Paulo, ESALQ, Departamento de Ciências Florestais, CEP 13418-900 Piracicaba, SP, Brazil;2. Instituto de Pesquisas e Estudos Florestais (IPEF), Piracicaba, SP, Brazil;3. Universidade Federal do Paraná, Curitiba, PR, Brazil;4. Universidade Federal de Viçosa, MG, Brazil;5. Klabin, Telêmaco Borba, PR, Brazil;6. CIRAD, UMR 111, Ecologie Fonctionnelle & Biogéochimie des Sols & Agro-écosystèmes, F-34060 Montpellier, France;7. USP, Universidade de São Paulo, Departamento de Ciências Atmosféricas, IAG, CEP 05508-900 São Paulo, Brazil;8. Université de Lorraine, UMR INRA-UL 1137, Ecologie et Ecophysiologie Forestières, Faculté des Sciences, Vandoeuvret-les-Nancy, France;1. Department of Biosystems Engineering, “Luiz de Queiroz” College of Agriculture (ESALQ), University of São Paulo (USP), Piracicaba, SP, Brazil;2. Forestry Science and Research Institute (IPEF), Piracicaba, SP, Brazil;3. Suzano SA Company, Itapetininga, SP, Brazil;1. Federal University of Santa Catarina – UFSC, 89.520-000 Curitibanos, SC, Brazil;2. Department of Forest Sciences, University of São Paulo – ESALQ, 13416-000 Piracicaba, SP, Brazil;3. Suzano Papel e Celulose Brasil, Av. Dr. José Lembo, 1010, Itapetininga, SP 18207-780, Brazil;4. Forestry Science and Research Institute – IPEF, 13415-000 Piracicaba, SP, Brazil;5. Instituto Centro de Vida, Cuiabá, MT 78043-055, Brazil |
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| Abstract: | Specific leaf area (SLA; m2leaf kg?1leaf) is a key ecophysiological parameter influencing leaf physiology, photosynthesis, and whole plant carbon gain. Both individual tree-based models and other forest process-based models are generally highly sensitive to this parameter, but information on its temporal or within-stand variability is still scarce. In a 2–4-year-old Eucalyptus plantation in Congo, prone to seasonal drought, the within-stand and seasonal variability in SLA were investigated by means of destructive sampling carried out at 2-month intervals, over a 2-year period. Within-crown vertical gradients of SLA were small. Highly significant relationships were found between tree-average SLA (SLAt) and tree size (tree height, Ht, or diameter at breast height, DBH): SLAt ranged from about 9 m2 kg?1 for dominant trees to about 14–15 m2 kg?1 for the smallest trees. The decrease in SLAt with increasing tree size was accurately predicted from DBH using power functions. Stand-average SLA varied by about 20% during the year, with lowest values at the end of the 5-month dry season, and highest values about 2–3 months after the onset of the wet season. Variability in leaf water status according to tree size and season is discussed as a possible determinant of both the within-stand and seasonal variations in SLA. |
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