1,720,973 research outputs found
Plantaciones en Patagonia
Full text linkSe presenta un contrapunto sobre diferentes aspectos relacionados con las forestaciones en los ecosistemas del norte de la patagonia. Se aborda los principales efectos ambientales que ocasionan las forestaciones, las politicas de subsidios a las plantaciones y los efectos socialkes y economicos que pueden tener las plantacionesFil: Grosfeld, Javier Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; ArgentinaFil: Loguercio, Gabriel Angel. Universidad Nacional de la Patagonia; Argentin
Plantación de ciprés de la cordillera de 57 años de edad : una experiencia en el Parque Nacional Los Alerces
Full text linkEn el año 1947 la Administración Nacional de Parques instaló una parcela de reforestación con ciprés de la cordillera (Austrocedrus chilensis (D. Don) Pic. Sern. et Bizarri) de 700 m2, en un área degradada, próxima a Puerto Limonao (P.N. Los Alerces). La precipitación y temperatura anual es de 1.610 mm/año y 9,1 ºC, respectivamente. El suelo, derivado de pumita, es profundo (> 1 m), bien drenado, con textura franco arenosa y sin fragmentos gruesos. La secuencia de horizontes es A/ABw/Bw/C1/C2 y corresponde al Orden Andisol. La plantación se realizó con renovales extraídos del bosque aledaño, utilizando un distanciamiento aproximado de 2 m entre plantas. Durante el desarrollo del rodal no se realizaron reposiciones, podas, ni raleos. A los 57 años de edad, con una densidad de 1968 arb/ha y una altura dominante de 18,4 m, el diámetro medio cuadrático es 24,2 cm, el volumen 695 m3/ha y el crecimiento medio anual alcanzó los 12,2 m3/ha/año. La forma y sanidad general es buena. Esta experiencia de largo plazo, probablemente la más antigua de la región, permite comprobar el buen comportamiento y crecimiento del ciprés de la cordillera en una forestación.Fil: Loguercio, Gabriel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Buduba, Carlos Guillermo. Instituto Nacional de Tecnología Agropecuaria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: la Manna, Ludmila Andrea. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Growth and potential of lomatia hirsuta forests from stump shoots in the valley of El Manso/Patagonia/Argentina
Full text linkLomatia hirsuta (Lam.) Diels is a pioneer tree species that develops after wildfires, and in advanced successional stages, it is often found as a secondary species in Patagonian forests. However, in El Manso Valley, Province of Río Negro in Western Argentina, L. hirsuta forms mature pure stands, originated from stump shoots. The wood is very attractive for its colourful appearance and beautiful grain. Nevertheless, these forests are not managed for timber production, they are mostly strong thinned for grazing, and the wood is mainly used as firewood. The objective of this study was to evaluate the possibility to improve quality wood production in stands through silvicultural interventions in a sustainable way. Samples have been carried out in stands of different developmental stages. We evaluated the state and quality of the trees, and their growth has been studied by means of trunk analysis. The results indicate that there is significant potential to improve the production of quality wood in dense stands by thinning to release crop trees. Thinning should start in young stands. It also became apparent that forest management is first necessary to stabilise these nearly unattended forests.Fil: Kühn, Hendrik. University of Applied Sciences; AlemaniaFil: Loguercio, Gabriel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel; ArgentinaFil: Caselli, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Thren, Martin. University of Applied Sciences; Alemani
Stand level volume increment in relation to leaf area index of Austrocedrus chilensis and Nothofagus dombeyi mixed forests of Patagonia, Argentina
No full textThe growing space occupied by trees in a forest stand -understood as the set of site resources used by trees-, can be reasonably represented by the leaf area index (LAI). Through different silvicultural management activities, stand structure can be manipulated to provide more growing space for the most efficient components that, related to the growing space they occupy, may improve the productivity of the stand. Austrocedrus chilensis and Nothofagus dombeyi, can grow in mixed forests presenting generally two height layers of high productive potential. However, it is necessary to know how these trees grow for designing target management structures to maximize stands productivity. The objective of this study was to determine, in mixed A. chilensis and N. dombeyi forests, the effect that the distribution of the leaf area, by species and height strata, has on the productivity of the stand. Results showed that the stand volume increment was more related to the distribution of the LAI by species than to the total LAI of the stand. Nothofagus dombeyi contributed more to the stand growth and showed twice the growing space efficiency than A. chilensis per unit of leaf area. In addition, growing space efficiency of the species decreased as the LAI of the stand increased. It appears that in these mixed forests, N. dombeyi is the main regulator of productivity.Fil: Caselli, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Loguercio, Gabriel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Urretavizcaya, María Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Defossé, Guillermo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagónica. Universidad Nacional de la Patagonia "San Juan Bosco". Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentin
Light and moisture conditions suitable for establishing Andean cypress and coihue beech seedlings in Patagonia: a nursery approach
Full text linkAndean cypress and coihue beech are endemic species of the Patagonian Andean forests of Argentina. Both species grow in either pure or mixed stands. Some pure cypress stands are affected by a root disease called "mal del ciprés," reducing their possibilities of being managed for timber production. Coihue beech could be introduced in pure sick cypress stands to help recover their productive potential. However, knowledge is limited about how soil moisture and light may affect early establishment of seedlings of both species. In this study, we determined, under nursery conditions, how survival and growth of cypress and coihue beech seedlings are affected by the combined effects of different soil moisture and light conditions. Both species showed similar survival and growth responses and were susceptible to extreme drought. While similar survival percentages were shown between them, low light levels and higher adaptation to drought significantly delayed cypress seedling mortality compared with coihue beech. Low light and moisture levels negatively affect growth, while the highest growth was registered at intermediate and high levels of light and soil moisture. Although coihue beech seedlings grew faster than cypress, both have the potential for recovering cypress stands affected by "mal del ciprés."Fil: Caselli, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Urretavizcaya, María Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Loguercio, Gabriel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; ArgentinaFil: Defossé, Guillermo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; Argentin
Assessing uncertainty in bioclimatic modelling: a comparison of two high-resolution climate datasets in northern Patagonia
No full textClimate change is reshaping forest ecosystems, presenting urgent and complex challenges that demand attention. In this context, research that quantifies interactions between climate and forests is substantial. However, modelling at a spatial resolution relevant for ecological processes presents a significant challenge, especially given the diverse geographical contexts in which it is applied. In our study, we aimed to assess the effects of applying CHELSA v.2.1 and WorldClim v2.1 data on bioclimatic analysis within the Río Puelo catchment area in northern Patagonia. To achieve this, we inter-compared and evaluated present and future bioclimates, drawing on data from both climate datasets. Our findings underscore substantial consistency between both datasets for temperature variables, confirming the reliability of both for temperature analysis. However, a strong contrast emerges in precipitation predictions, with significant discrepancies highlighted by minimal overlap in bioclimatic classes, particularly in steep and elevated terrains. Thus, while CHELSA and WorldClim provide valuable temperature data for northern Patagonia, their use for precipitation analysis requires careful consideration of their limitations and potential inaccuracies. Nevertheless, our bioclimatic analyses of both datasets under different scenarios reveal a uniform decline in mountain climates currently occupied by N. pumilio, with projections suggesting a sharp decrease in their coverage under future climate scenarios
Weed control and use of tree shelters: improving restoration success of degraded north Patagonian forests
Full text linkAustrocedrus chilensis and Nothofagus dombeyi are endemic species of the Andean-Patagonian forests of Argentina. Both species grow in either pure or mixed stands. In the last decades, several A. chilensis stands have been degraded by different disturbances that have compromised their natural regeneration. Plantation of seedlings of both species may be an alternative to help restore ecological, scenic and productive characteristics of these stands. In this study, we determined, in degraded A. chilensis stands grown in a xeric (≈ 690 mm.yr−1) and a mesic (≈ 984 mm.yr−1) site without canopy cover, the effects of tree shelters, the presence/absence of neighboring herbaceous vegetation, and the interaction between these factors on the performance (i.e. survival and growth) of planted N. dombeyi and A. chilensis seedlings, during four growing seasons. Results showed that tree shelters improved survival of N. dombeyi in the mesic site, and improved survival of both species in the xeric site. The removal of neighboring herbaceous vegetation improved the survival and diameter growth of both species at the xeric site, and improved the diameter growth of both species at the mesic site. By applying these planting technologies, both species could be successfully used for restoring highly degraded A. chilensis stands at mesic sites, while it is more advisable to use A. chilensis at xeric sites under open sky conditions.Fil: Caselli, Marina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Urretavizcaya, María Florencia. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Loguercio, Gabriel Angel. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Contardi, Liliana. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Gianolini, Stefano Guastavo. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Defossé, Guillermo Emilio. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagónica. Universidad Nacional de la Patagonia "San Juan Bosco". Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentin
Effects of canopy cover and neighboring vegetation on the early development of planted Austrocedrus chilensis and Nothofagus dombeyi in north Patagonian degraded forests
No full textAustrocedrus chilensis and Nothofagus dombeyi, are endemic forest species of ecological and productive importance in the Andean-Patagonian region of Argentina. Both species grow in pure or mixed stands. In the last decades, several A. chilensis stands have been degraded by different disturbances that have compromised their natural regeneration. Plantation of seedlings of both species may be an alternative to help restore degraded A. chilensis stands. In this study we determined, in degraded A. chilensis stands grown in a xeric and a mesic site, the effects of canopy cover, the presence/absence of neighboring herbaceous vegetation and the interaction between these factors, on the performance (i.e. survival and growth) of planted N. dombeyi and A. chilensis seedlings, during three growing seasons. Results showed that in both xeric and mesic sites, survival and growth of either species were reduced when canopy cover was below 30%. Removal of neighboring vegetation improved survival of both species at the xeric site, and improved growth of both species at the mesic site. Canopy cover and removal of neighboring vegetation seem to interact by improving survival and growth of A. chilensis, while for N. dombeyi the effects of these factors, when present, are independent, both improving survival and growth. Austrocedrus chilensis has greater capacity than N. dombeyi to tolerate the high radiation and low soil moisture combination, so this species is more recommendable for planting at most exposed conditions (no canopy cover at xeric sites), but both species could be successfully used for restoring degraded A. chilensis stands.Fil: Caselli, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Urretavizcaya, María Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Loguercio, Gabriel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel; ArgentinaFil: Contardi, Liliana. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel; ArgentinaFil: Gianolini, Stefano Guastavo. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Defossé, Guillermo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagónica. Universidad Nacional de la Patagonia "San Juan Bosco". Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel; Argentin
Developing silvicultural tools for managing mixed forest structures in Patagonia
No full textLeaf area is an important ecophysiological and silvicultural variable for quantifying the potential production of trees, since it can represent growing space occupancy. At the stand level in mixed forests, productivity is conditioned on how growing space is distributed among different components structure, such as species and strata. In complex structures, traditional forest variables (i.e., basal area) do not allow a good representation of the occupied growing space, whereas leaf area appears as a better indicator. Andean cypress and coihue beech are species of the Andean-Patagonian forests that grow in either pure or mixed stands, presenting high productive potential. The aim of this study was to develop, for each species, leaf area prediction functions through allometric relations and to evaluate the relation between leaf area, volume increment and growing space occupancy. For this purpose, we carried out destructive sampling of individuals of both species in mixed Andean cypress-coihue forests. Results for these species show that leaf area can be reliably estimated by using the models developed in this study. These models, based on sapwood area, tree diameter, and/or height measurements, explain at least 90 percent of variation in leaf area. The functions fitted are a fundamental tool to study the distribution of growth and to formulate management guidelines for mixed forests through the control of growing space occupancy using leaf area index.Fil: Caselli, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Loguercio, Gabriel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; ArgentinaFil: Urretavizcaya, María Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; ArgentinaFil: Defossé, Guillermo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigación y Extensión Forestal Andino Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ingeniería - Sede Esquel. Departamento de Ingeniería Forestal; Argentin
Coihue and andean cypress saplings growth in relation to canopy leaf area index
Full text linkLa ocupación del espacio de crecimiento del dosel tiene influencia sobre el desarrollo de la regeneración natural. El índice de área foliar (IAF) del dosel es una variable que se puede utilizar en estudios ecológicos y en la toma de decisiones silviculturales para representar el espacio de crecimiento ocupado en un rodal. Es especialmente útil en bosques mixtos, ya que permite captar mejor la complejidad de la estructura forestal que otras variables de densidad. El ciprés de la cordillera (Austrocedrus chilensis) y el coihue (Nothofagus dombeyi) son especies de importancia forestal de los bosques andino-patagónicos, que pueden crecer en formaciones mixtas con potencial productivo. Determinar cuáles son las estructuras forestales necesarias para promover la regeneración implica conocer cómo el espacio de crecimiento que ocupa el dosel afecta el crecimiento de la regeneración avanzada. El objetivo de este estudio fue evaluar la relación entre el IAF del dosel y su distribución entre especies y estratos de altura con el incremento en altura de la regeneración avanzada de ciprés y coihue. El incremento en altura de los renovales muestra una tendencia opuesta al IAF del dosel, aunque esta relación es significativa sólo para coihue, para el cual por debajo de un IAF cercano a 4 favorece el crecimiento de los renovales. A su vez, el incremento en altura de los renovales, en especial del coihue, se ve influenciado negativamente por una participación mayor de coihue en el IAF del dosel. A partir de los resultados se infiere que para promover el crecimiento de la regeneración de ambas especies es necesario mantener, mediante raleos, el IAF por debajo de 4 en los sectores que se requiera promover la regeneración de coihue, y por encima de 4 para la de ciprés de la cordillera.The growing space occupancy by the canopy influences the development of natural regeneration. The leaf area index (LAI) is a variable that can be used in ecological studies and in silvicultural decisions process to represent the growing space occupancy in a stand. It is especially useful in mixed forests, as it is better at capturing the complexity of forest structure than other density variables. Andean cypress (Austrocedrus chilensis) and coihue (Nothofagus dombeyi) are species of forest importance of the Andean-Patagonian forests, which can grow in mixed formations with productive potential. Being able to determine which are the target structures of these forests to promote regeneration implies knowing how the canopy growing space occupancy affects the growth of advanced regeneration. The objective of this study was to evaluate the relationship between the canopy LAI and its distribution in the species and height strata with the height increment of advanced regeneration of Andean cypress and coihue. The height increment of the saplings shows an opposite tendency to the LAI of the canopy, although this relationship is significant only for coihue. For this species, the growth of the saplings is favored below a canopy LAI close to 4. In turn, the height increment, especially for coihue, is negatively influenced by a greater participation of coihue in the canopy LAI. From the results, it is inferred that, in order to stimulate the growth of the regeneration of both species, it is necessary to keep, by thinning, the LAI below 4 in the sectors where it is necessary to promote the regeneration of coihue, and above 4 to promote the Andean cypress regeneration.Fil: Caselli, Marina. CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.Fil: Loguercio, Gabriel Angel. Universidad Nacional de la Patagonia San Juan Bosco - Sede Esquel. Centro de Investigación y Extensión Forestal Andino Patagónico (CIEFAP)Fil: Urretavizcaya, María Florencia. CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas, ArgentinaFil: Defossé, Guillermo Emilio. CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas, Argentin
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