Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events

Background: Forest ecosystems undergo significant transformations due to harvesting and climate fluctuations, emphasizing the critical role of seeding in natural regeneration and long-term structural preservation. Climate change further amplifies these dynamics, affecting phenology across species an...

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Autores principales: Rodríguez Souilla, Julián, Chaves, Jimena E., Lencinas, María Vanessa, Cellini, Juan Manuel, Roig, Fidel A., Peri, Pablo L., Martínez Pastur, Guillermo José
Formato: Articulo
Lenguaje:Inglés
Publicado: 2024
Materias:
Ciencias Agrarias
Forest management
Seeding
Climate change
Extreme event
Patagonia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/167309
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-167309
record_format dspace
spelling I19-R120-10915-1673092024-06-14T20:05:32Z http://sedici.unlp.edu.ar/handle/10915/167309 Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events Rodríguez Souilla, Julián Chaves, Jimena E. Lencinas, María Vanessa Cellini, Juan Manuel Roig, Fidel A. Peri, Pablo L. Martínez Pastur, Guillermo José 2024 2024-06-14T18:44:54Z en Ciencias Agrarias Forest management Seeding Climate change Extreme event Patagonia Background: Forest ecosystems undergo significant transformations due to harvesting and climate fluctuations, emphasizing the critical role of seeding in natural regeneration and long-term structural preservation. Climate change further amplifies these dynamics, affecting phenology across species and regions. In Tierra del Fuego (Argentina), Nothofagus pumilio (lenga) forests represent the most important timber resource, and it is managed through different silvicultural strategies. This species demonstrates notable post-disturbance regeneration, yet seed fall exhibits significant variability, leading to variations in seed quality (e.g., viability). This study aims to assess fluctuations in N. pumilio seed quality, determine how it varies concerning forest management strategies, annual productivity, and the cooccurrence of climatic phenomena including El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM). Results: Viable seeds represented 18.4% of the total, notably higher in unharvested than in managed areas. Conversely, empty seeds were more prevalent in harvested areas (> 75%). Seed quality exhibited significant differences across silvicultural treatments, except for insect-predated seeds, which had similar proportions across all areas, though dispersed retention showed higher predation. When considering years with varying production levels, high-production years favoured full and viable seeds, particularly in unharvested forests and aggregated retention, while low-production years saw reduced viability across all treatments. Quadratic models revealed that viability increased with seed production, where unharvested forests achieved the highest values. Climate variability influenced seed proportions, where ENSO+/SAM+ promoting more full and viable seeds, while ENSO–/SAM+ favoured nonpredated seeds, especially in unharvested stands. Conclusions: Seed quality varies among treatments and years with different levels of seeding. Variations in seed quality, linked to climatic events, influence seed viability. Seed quality plays a critical role in forest regeneration, ensuring a seedling bank for harvested stands to face climate variability. These findings are relevant for forest management and ecosystem services, considering the increasing climate variability and extreme events. Understanding these influences is crucial for Nothofagus pumilio forests’ sustainability and global forest adaptation strategies. Laboratorio de Investigaciones en Madera Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Agrarias
Forest management
Seeding
Climate change
Extreme event
Patagonia
spellingShingle Ciencias Agrarias
Forest management
Seeding
Climate change
Extreme event
Patagonia
Rodríguez Souilla, Julián
Chaves, Jimena E.
Lencinas, María Vanessa
Cellini, Juan Manuel
Roig, Fidel A.
Peri, Pablo L.
Martínez Pastur, Guillermo José
Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events
topic_facet Ciencias Agrarias
Forest management
Seeding
Climate change
Extreme event
Patagonia
description Background: Forest ecosystems undergo significant transformations due to harvesting and climate fluctuations, emphasizing the critical role of seeding in natural regeneration and long-term structural preservation. Climate change further amplifies these dynamics, affecting phenology across species and regions. In Tierra del Fuego (Argentina), Nothofagus pumilio (lenga) forests represent the most important timber resource, and it is managed through different silvicultural strategies. This species demonstrates notable post-disturbance regeneration, yet seed fall exhibits significant variability, leading to variations in seed quality (e.g., viability). This study aims to assess fluctuations in N. pumilio seed quality, determine how it varies concerning forest management strategies, annual productivity, and the cooccurrence of climatic phenomena including El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM). Results: Viable seeds represented 18.4% of the total, notably higher in unharvested than in managed areas. Conversely, empty seeds were more prevalent in harvested areas (> 75%). Seed quality exhibited significant differences across silvicultural treatments, except for insect-predated seeds, which had similar proportions across all areas, though dispersed retention showed higher predation. When considering years with varying production levels, high-production years favoured full and viable seeds, particularly in unharvested forests and aggregated retention, while low-production years saw reduced viability across all treatments. Quadratic models revealed that viability increased with seed production, where unharvested forests achieved the highest values. Climate variability influenced seed proportions, where ENSO+/SAM+ promoting more full and viable seeds, while ENSO–/SAM+ favoured nonpredated seeds, especially in unharvested stands. Conclusions: Seed quality varies among treatments and years with different levels of seeding. Variations in seed quality, linked to climatic events, influence seed viability. Seed quality plays a critical role in forest regeneration, ensuring a seedling bank for harvested stands to face climate variability. These findings are relevant for forest management and ecosystem services, considering the increasing climate variability and extreme events. Understanding these influences is crucial for Nothofagus pumilio forests’ sustainability and global forest adaptation strategies.
format Articulo
Articulo
author Rodríguez Souilla, Julián
Chaves, Jimena E.
Lencinas, María Vanessa
Cellini, Juan Manuel
Roig, Fidel A.
Peri, Pablo L.
Martínez Pastur, Guillermo José
author_facet Rodríguez Souilla, Julián
Chaves, Jimena E.
Lencinas, María Vanessa
Cellini, Juan Manuel
Roig, Fidel A.
Peri, Pablo L.
Martínez Pastur, Guillermo José
author_sort Rodríguez Souilla, Julián
title Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events
title_short Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events
title_full Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events
title_fullStr Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events
title_full_unstemmed Quality evaluation of Nothofagus pumilio seeds linked to forest management and climatic events
title_sort quality evaluation of nothofagus pumilio seeds linked to forest management and climatic events
publishDate 2024
url http://sedici.unlp.edu.ar/handle/10915/167309
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