https://repositorio.uchile.cl/handle/2250/117690 Artículos de revistas Thu, 07 May 2026 23:46:17 GMT 2026-05-07T23:46:17Z https://repositorio.uchile.cl/handle/2250/194803 Present and prospects for multi-aged silviculture in Chilean temperate forests: targeting secondary forests in transition and partially harvested old-growth forests Donoso, Pablo J.; Soto, Daniel P.; Salas Eljatib, Christian Eduardo; Riquelme Buitano, Tomás R. Valdivian Temperate Rainforests in Chile have a global conservation value, but nowadays many correspond to secondary forests following regeneration in agricultural and burned lands, and to high-graded old-growth due to mismanagement, especially at mid to low elevations. Perspectives for increasing old-growth attributes in these productive forests through silviculture are high considering the diverse demands of ecosystem services and the high timber value of tree species. In the Llancahue experimental forest (40 degrees S Lat) we implemented three ecological silviculture approaches: variable-density thinning in a Nothofagus dombeyi secondary forest (NDS), irregular shelterwood in a mature N. dombeyi forest (NDM), and single-tree selection cutting in a partially harvested old-growth forest (OG). Based upon an old-growth index (OGI) that includes density, basal area (BA), BA of the trees >80 cm in diameter, ba of shade-tolerant species, and the Gini coefficient, and aims to estimate how close a given forest is to a typical old-growth forest, these forests had a 22, 22, and 62% OGI before management. The OGI remained similar or declined following management, but 7-10 years after management it increased in NDS and NDM and declined in the OG (significant changes only in NDM and OG). We discuss these results considering that managed forests should target for an OGI approximate to 70% rather than maximum values. These managed forests contribute to halt degradation, mitigate climate change (carbon stores in the forest and in timber), and may have greater adaptive capacity to disturbances. We discuss perspectives for the potential scale-up of implementing these approaches. Sat, 01 Jan 2022 00:00:00 GMT https://repositorio.uchile.cl/handle/2250/194803 2022-01-01T00:00:00Z https://repositorio.uchile.cl/handle/2250/192572 Provenance causes variation on early growth and survival and sun protection on physiological responses of the vulnerable Nothofagus glauca (Phil.) Krasser in a common garden in Central Chile Quiroz, Iván A.; Espinoza, Sergio E.; Yañez, Marco A.; Magni Díaz, Carlos Renato; Martínez, Eduardo E.; Gutiérrez, Braulio T.; Faúndez, Angela F.; Vaswani Miranda, Suraj Antonio We assessed outplanting performance of N. glauca in two trials. In Trial 1, provenances from Pre- Andean (Linares, Longaví) and Coastal (Curanipe, Empedrado) origins were planted in a common garden under two sun protection treatments (i.e., black mesh shelter, and kaolin at 6% concentration), and a control treatment at full sun. In Trial 2, a local provenance was established under two site preparation treatments (i.e., old subsoiling from 4 years ago versus no-subsoiling). Growth, survival, gas exchange, and Chlorophyll fluorescence parameters were measured one year after outplanting. In Trial 1 survival was similar among treatments but larger seedlings were found under kaolin and in the local provenance Empedrado. The provenances varied by sun protection treatment in survival, and the Pre Andean provenance Linares tended to show the lowest survival at full sun. At the leaf-level physiology, provenances responded similarly in gas exchange and fluorescence parameters. In the sun protection treatments seedlings under kaolin increased stomatal conductance and electron transport, but decreased photosynthesis, water use efficiency, and efficiency of PSII. Provenances also varied by treatment in physiology. The Empedrado provenance exhibited the highest transpiration and stomatal conductance under kaolin whereas the Pre Andean provenance of Longaví showed the lowest photosynthesis and efficiency of PSII in the kaolin treatment. In Trial 2, root collar diameter, intercellular CO2 and water use efficiency were higher in the old-subsoiling treatment. As a potential adaptation tool, seed sources from Pre Andean origins can be established in Coastal origins with no detriments on seedling survival. Sat, 01 Jan 2022 00:00:00 GMT https://repositorio.uchile.cl/handle/2250/192572 2022-01-01T00:00:00Z https://repositorio.uchile.cl/handle/2250/191723 Assessing land surface phenology in Araucaria-Nothofagus forests in Chile with Landsat 8/Sentinel 2 time series Kosczor, E.; Forkel, M.; Hernández Palma, Héctor Jaime; Kinalczyk, D.; Pirotti, F.; Kutchartt, E. include red-listed species and have a high cultural importance for the ancestral population and thus require continuous monitoring to support conservation. Monitoring of phenology by satellite observations is a key tool to quantify the impact of climate variability on terrestrial vegetation. Here we aim to provide a first quantification and ecological understanding of the land surface phenology of protected Araucaria-Nothofagus forests in the Conguillío National Park in southern Chile. We exploit time series of enhanced vegetation index from Landsat 8 and Sentinel-2 satellite imagery from 2016 to 2020 to derive start and end-of-season (SOS and EOS) information at 10 × 10 m spatial resolution. Results show that, on average, SOS varies between 11th October and 5th November (quantiles 25% and 75% of all pixels). SOS occurs later at higher elevation, in sparsely vegetated stands, or in stands dominated by Nothofagus antarctica. EOS occurs on average between 24th March and 14th April. EOS shows a high variability between neighboring pixels that cannot be easily associated with forest stands or topography. Comparisons with regional-aggregated temperature and precipitation time series show that SOS is delayed with colder winter and spring temperatures and EOS shows stronger (but contrasting) correlations with summer and fall precipitation. By using a machine learning approach, we find that elevation is the main control on the spatial-temporal variability of SOS and EOS, followed by aspect, slope and total tree cover. These results suggest that meteorological conditions control the inter-annual variability of the phenology of Araucaria- Nothofagus forests but the effect is modified by small-scale topography, climate and stand characteristics. Sat, 01 Jan 2022 00:00:00 GMT https://repositorio.uchile.cl/handle/2250/191723 2022-01-01T00:00:00Z https://repositorio.uchile.cl/handle/2250/191582 Quality and sustainability indicators of the prefabricated wood housing industry—a chilean case study Garay Moena, Rosemarie; Pfenniger Bobsien, Francis Antonio; Castillo Soto, Miguel Eduardo; Fritz, Consuelo Wood industrialization provides a contribution to timber-based building. The Chilean market is based on attributes such as the experience and trust of companies. The sales price, meeting deadlines and quality are attributes that have motivated buyers. There are more attributes to assess that are important for the client and market country: building materials and safety, sustainability, and environmental assessment. Some of these valuations are provided by certifications such as life cycle analysis, reduction of energy, water, gas consumption, thermal, acoustic insulation, fire resistance, etc. The objective is to propose an evaluation tool using sustainability indicators for prefabricated lumberbased buildings, using technical benefits of wood as an option for manufacturing prefabricated structures. They constitute references that can be integrated with international construction standards and with it, a process of improvement of the current standards for the housing solution and protection of the environment. The methodology is based on standards compliance levels, according to current, voluntary, or referential regulations, seeking to differentiate the market offer of prefabricated homes through quality indicators, benchmarking and sustainability. The results are an evaluation model synthesized into three tables according to the category evaluated: materials, products, or structures. It concludes that, to meet demand, the market must adapt its offer to new requirements where it does matter how the housing is produced, not only in the economic aspect, but also its impact on the social aspect and the environment and what it offers in terms of quality of life. The lumber-based building sector needs sustainability attributes indicators to potentiate the companies and start a differentiation business. Fri, 01 Jan 2021 00:00:00 GMT https://repositorio.uchile.cl/handle/2250/191582 2021-01-01T00:00:00Z