Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture

Autores
Martínez Pastur, Guillermo José; Lencinas, María Vanessa; Peri, Pablo Luis; Arena, Miriam Elizabeth
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Nothofagus seedlings often survive and grow slowly for a long time in the shaded understory. This creates a seedling bank with a potential advantage in reestablishing canopy disturbances. To manage primary forests more effectively, it is important to understand the basis of plant regeneration ecophysiology, and their plasticity to changes in environmental factors. The objective was to evaluate the photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture gradients; and to relate them with silvicultural prescriptions. Six treatments with three light intensities (4, 26 and 64% of the natural incident irradiance) and two soil moistures levels (40–60 and 80–100% soil capacity) were assayed under greenhouse controlled conditions. CO2 gas exchanges were measured every month on seedlings growing in each condition. In the shaded treatments seedlings grow below their optimum photosynthetic potential (leaf light-saturated net photosynthesis rate of 5.1 μmol CO2 m−2 s−1) compared with the lighted treatments by improving their photosynthetic performance (8.3–8.4 μmol CO2 m−2 s−1). Seedling growing under low soil moisture conditions had higher leaf light-saturated net photosynthesis rate than plants grown under 80–100% soil water capacity (7.8 and 6.6 μmol CO2 m−2 s−1, respectively). When light (up to 150–200 μmol m−2 s−1) and soil moisture (40–60% soil capacity) levels were favourable, seedling plants could exhibit their maximum photosynthetic capacity. If one of these factors became limiting, the plants reduced their photosynthetic rate, e.g. N. pumilio seedlings with enough light and high levels of soil moisture, probably decreased their growth and fine roots activity. For this, application of silviculture systems must take into account the changes in both factors (light and soil moisture) for maximize the growth potential in the natural regeneration. These findings must be combined with morphological variables at a whole-plant, shoot, crown and leaf levels to determine the optimum growth conditions.
EEA Santa Cruz
Fil: Martínez Pastur, Guillermo José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.
Fil: Lencinas, María Vanessa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.
Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina.
Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral; Argentina.
Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Arena, Miriam Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.
Fuente
Forest Ecology and Management 243 (2-3) : 274-282. (2007)
Materia
Primary Forests
Silviculture
Regeneration
Ecophysiology
Respiration
Gas Exchange
Photosynthesis
Seedlings
Bosques Primarios
Silvicultura
Regeneración
Ecofisiología
Respiración
Intercambio de Gases
Fotosíntesis
Nothofagus pumilio
Plántulas
Light Intensity
Intensidad de Luz
Región Patagónica
Nivel de accesibilidad
acceso restringido
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
INTA Digital (INTA)
Institución
Instituto Nacional de Tecnología Agropecuaria
OAI Identificador
oai:localhost:20.500.12123/23918

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oai_identifier_str oai:localhost:20.500.12123/23918
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network_name_str INTA Digital (INTA)
spelling Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moistureMartínez Pastur, Guillermo JoséLencinas, María VanessaPeri, Pablo LuisArena, Miriam ElizabethPrimary ForestsSilvicultureRegenerationEcophysiologyRespirationGas ExchangePhotosynthesisSeedlingsBosques PrimariosSilviculturaRegeneraciónEcofisiologíaRespiraciónIntercambio de GasesFotosíntesisNothofagus pumilioPlántulasLight IntensityIntensidad de LuzRegión PatagónicaNothofagus seedlings often survive and grow slowly for a long time in the shaded understory. This creates a seedling bank with a potential advantage in reestablishing canopy disturbances. To manage primary forests more effectively, it is important to understand the basis of plant regeneration ecophysiology, and their plasticity to changes in environmental factors. The objective was to evaluate the photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture gradients; and to relate them with silvicultural prescriptions. Six treatments with three light intensities (4, 26 and 64% of the natural incident irradiance) and two soil moistures levels (40–60 and 80–100% soil capacity) were assayed under greenhouse controlled conditions. CO2 gas exchanges were measured every month on seedlings growing in each condition. In the shaded treatments seedlings grow below their optimum photosynthetic potential (leaf light-saturated net photosynthesis rate of 5.1 μmol CO2 m−2 s−1) compared with the lighted treatments by improving their photosynthetic performance (8.3–8.4 μmol CO2 m−2 s−1). Seedling growing under low soil moisture conditions had higher leaf light-saturated net photosynthesis rate than plants grown under 80–100% soil water capacity (7.8 and 6.6 μmol CO2 m−2 s−1, respectively). When light (up to 150–200 μmol m−2 s−1) and soil moisture (40–60% soil capacity) levels were favourable, seedling plants could exhibit their maximum photosynthetic capacity. If one of these factors became limiting, the plants reduced their photosynthetic rate, e.g. N. pumilio seedlings with enough light and high levels of soil moisture, probably decreased their growth and fine roots activity. For this, application of silviculture systems must take into account the changes in both factors (light and soil moisture) for maximize the growth potential in the natural regeneration. These findings must be combined with morphological variables at a whole-plant, shoot, crown and leaf levels to determine the optimum growth conditions.EEA Santa CruzFil: Martínez Pastur, Guillermo José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.Fil: Lencinas, María Vanessa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina.Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral; Argentina.Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Arena, Miriam Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.Elsevier2025-09-24T11:33:24Z2025-09-24T11:33:24Z2007-05-31info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/23918https://www.sciencedirect.com/science/article/pii/S0378112707002319Martínez Pastur G., Lencinas M.V., Peri P.L., Arena M. (2007) Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture. Forest Ecology and Management 243: 274-282.0378-1127https://doi.org/10.1016/j.foreco.2007.03.034Forest Ecology and Management 243 (2-3) : 274-282. (2007)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2025-09-29T13:47:32Zoai:localhost:20.500.12123/23918instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2025-09-29 13:47:33.086INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
title Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
spellingShingle Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
Martínez Pastur, Guillermo José
Primary Forests
Silviculture
Regeneration
Ecophysiology
Respiration
Gas Exchange
Photosynthesis
Seedlings
Bosques Primarios
Silvicultura
Regeneración
Ecofisiología
Respiración
Intercambio de Gases
Fotosíntesis
Nothofagus pumilio
Plántulas
Light Intensity
Intensidad de Luz
Región Patagónica
title_short Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
title_full Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
title_fullStr Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
title_full_unstemmed Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
title_sort Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture
dc.creator.none.fl_str_mv Martínez Pastur, Guillermo José
Lencinas, María Vanessa
Peri, Pablo Luis
Arena, Miriam Elizabeth
author Martínez Pastur, Guillermo José
author_facet Martínez Pastur, Guillermo José
Lencinas, María Vanessa
Peri, Pablo Luis
Arena, Miriam Elizabeth
author_role author
author2 Lencinas, María Vanessa
Peri, Pablo Luis
Arena, Miriam Elizabeth
author2_role author
author
author
dc.subject.none.fl_str_mv Primary Forests
Silviculture
Regeneration
Ecophysiology
Respiration
Gas Exchange
Photosynthesis
Seedlings
Bosques Primarios
Silvicultura
Regeneración
Ecofisiología
Respiración
Intercambio de Gases
Fotosíntesis
Nothofagus pumilio
Plántulas
Light Intensity
Intensidad de Luz
Región Patagónica
topic Primary Forests
Silviculture
Regeneration
Ecophysiology
Respiration
Gas Exchange
Photosynthesis
Seedlings
Bosques Primarios
Silvicultura
Regeneración
Ecofisiología
Respiración
Intercambio de Gases
Fotosíntesis
Nothofagus pumilio
Plántulas
Light Intensity
Intensidad de Luz
Región Patagónica
dc.description.none.fl_txt_mv Nothofagus seedlings often survive and grow slowly for a long time in the shaded understory. This creates a seedling bank with a potential advantage in reestablishing canopy disturbances. To manage primary forests more effectively, it is important to understand the basis of plant regeneration ecophysiology, and their plasticity to changes in environmental factors. The objective was to evaluate the photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture gradients; and to relate them with silvicultural prescriptions. Six treatments with three light intensities (4, 26 and 64% of the natural incident irradiance) and two soil moistures levels (40–60 and 80–100% soil capacity) were assayed under greenhouse controlled conditions. CO2 gas exchanges were measured every month on seedlings growing in each condition. In the shaded treatments seedlings grow below their optimum photosynthetic potential (leaf light-saturated net photosynthesis rate of 5.1 μmol CO2 m−2 s−1) compared with the lighted treatments by improving their photosynthetic performance (8.3–8.4 μmol CO2 m−2 s−1). Seedling growing under low soil moisture conditions had higher leaf light-saturated net photosynthesis rate than plants grown under 80–100% soil water capacity (7.8 and 6.6 μmol CO2 m−2 s−1, respectively). When light (up to 150–200 μmol m−2 s−1) and soil moisture (40–60% soil capacity) levels were favourable, seedling plants could exhibit their maximum photosynthetic capacity. If one of these factors became limiting, the plants reduced their photosynthetic rate, e.g. N. pumilio seedlings with enough light and high levels of soil moisture, probably decreased their growth and fine roots activity. For this, application of silviculture systems must take into account the changes in both factors (light and soil moisture) for maximize the growth potential in the natural regeneration. These findings must be combined with morphological variables at a whole-plant, shoot, crown and leaf levels to determine the optimum growth conditions.
EEA Santa Cruz
Fil: Martínez Pastur, Guillermo José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.
Fil: Lencinas, María Vanessa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.
Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina.
Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral; Argentina.
Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Arena, Miriam Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas (CADIC); Argentina.
description Nothofagus seedlings often survive and grow slowly for a long time in the shaded understory. This creates a seedling bank with a potential advantage in reestablishing canopy disturbances. To manage primary forests more effectively, it is important to understand the basis of plant regeneration ecophysiology, and their plasticity to changes in environmental factors. The objective was to evaluate the photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture gradients; and to relate them with silvicultural prescriptions. Six treatments with three light intensities (4, 26 and 64% of the natural incident irradiance) and two soil moistures levels (40–60 and 80–100% soil capacity) were assayed under greenhouse controlled conditions. CO2 gas exchanges were measured every month on seedlings growing in each condition. In the shaded treatments seedlings grow below their optimum photosynthetic potential (leaf light-saturated net photosynthesis rate of 5.1 μmol CO2 m−2 s−1) compared with the lighted treatments by improving their photosynthetic performance (8.3–8.4 μmol CO2 m−2 s−1). Seedling growing under low soil moisture conditions had higher leaf light-saturated net photosynthesis rate than plants grown under 80–100% soil water capacity (7.8 and 6.6 μmol CO2 m−2 s−1, respectively). When light (up to 150–200 μmol m−2 s−1) and soil moisture (40–60% soil capacity) levels were favourable, seedling plants could exhibit their maximum photosynthetic capacity. If one of these factors became limiting, the plants reduced their photosynthetic rate, e.g. N. pumilio seedlings with enough light and high levels of soil moisture, probably decreased their growth and fine roots activity. For this, application of silviculture systems must take into account the changes in both factors (light and soil moisture) for maximize the growth potential in the natural regeneration. These findings must be combined with morphological variables at a whole-plant, shoot, crown and leaf levels to determine the optimum growth conditions.
publishDate 2007
dc.date.none.fl_str_mv 2007-05-31
2025-09-24T11:33:24Z
2025-09-24T11:33:24Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12123/23918
https://www.sciencedirect.com/science/article/pii/S0378112707002319
Martínez Pastur G., Lencinas M.V., Peri P.L., Arena M. (2007) Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture. Forest Ecology and Management 243: 274-282.
0378-1127
https://doi.org/10.1016/j.foreco.2007.03.034
url http://hdl.handle.net/20.500.12123/23918
https://www.sciencedirect.com/science/article/pii/S0378112707002319
https://doi.org/10.1016/j.foreco.2007.03.034
identifier_str_mv Martínez Pastur G., Lencinas M.V., Peri P.L., Arena M. (2007) Photosynthetic plasticity of Nothofagus pumilio seedlings to light intensity and soil moisture. Forest Ecology and Management 243: 274-282.
0378-1127
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv restrictedAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv Forest Ecology and Management 243 (2-3) : 274-282. (2007)
reponame:INTA Digital (INTA)
instname:Instituto Nacional de Tecnología Agropecuaria
reponame_str INTA Digital (INTA)
collection INTA Digital (INTA)
instname_str Instituto Nacional de Tecnología Agropecuaria
repository.name.fl_str_mv INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuaria
repository.mail.fl_str_mv tripaldi.nicolas@inta.gob.ar
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