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

作　　者：Julian Rodríguez‑Souilla Jimena E.Chaves María Vanessa Lencinas Juan Manuel Cellini Fidel A.Roig Pablo L.Peri Guillermo Martinez Pastur 

机构地区：[1] Laboratorio de Recursos Agroforestales,Centro Austral de Investigaciones Científicas(CADIC),Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Bernardo Houssay 200(9410)Ushuaia,Tierra del Fuego,Argentina [2] Laboratorio de Investigaciones en Maderas(LIMAD),Universidad Nacional de la Plata(UNLP),Diagonal 113469(1900)La Plata,Buenos Aires,Argentina [3] Instituto Argentino de Nivología,Glaciología y Ciencias Ambientales(IANIGLA),Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Parque San Martin S/N(5500)Mendoza,Mendoza,Argentina [4] Instituto Nacional de Tecnología Agropecuaria(INTA),Universidad Nacional de la Patagonia Austral(UNPA),Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Cc 332(9400)Río Gallegos,Santa Cruz,Argentina

出　　处：《Ecological Processes》2024年第1期98-107,共10页生态过程(英文)

基　　金：funded by the grant PIP 2021–2023 N°0871“Resilience of managed Nothofagus pumilioforests against harvesting,climate change and extreme events in Tierra del Fuego”of CONICET(Argentina)

摘　　要：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 signifi-cant 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 co-occurrence of climatic phenomena including El Ni?o-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.Con-versely,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 non-predated seeds,especially in unharvested stands.Conclusions Seed quality varies among treatments and years with different levels of seeding.Variations in seed qual-ity,linked to climatic events,influence seed viability.Seed quality plays a critical role i

关 键 词：Forest management SEEDING Climate change Extreme event PATAGONIA 

分 类 号：Q948[生物学—植物学]