Determination of homogeneous edaphoclimatic zones for the secondary forests of Nothofagus dombeyi in central-southern Chile

Esse, Carlos; Donoso, Pablo J.; Gerding, Víctor; Encina‐Montoya, Francisco

doi:10.4067/s0718-16202013000200010

Cited by 9 publications

(9 citation statements)

References 16 publications

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“…Another study found that, at a continental scale, N. obliqua productivity depends mainly on climate, although at a regional scale, edaphic and topographic variables are more relevant (Thiers et al 2008). Similarly, Esse et al (2013) found that the geographical distribution of N. dombeyi is explained, in decreasing order of importance, by annual average rainfall, thermal oscillation and soil drainage. Two critical factors that affect the variability of RO-RA-CO forests are: 1) the presence of pure or mixed forests, and 2) their regeneration strategy (Donoso 1993).…”

Section: Introductionmentioning

confidence: 84%

“…For example, for N. alpina and N. obliqua, Donoso et al (1993) defined four growth zones, where the most productive ones corresponded to those with warm temperatures. Esse et al (2013) proposed for N. dombeyi five growth zones, which were defined, in decreasing order, by climate, soil and topography. Furthermore, Gezan and Moreno (1999) defined four growth zones and 11 sub-zones based on the inventory and evaluation of native vegetation resources of Chile (CONAF et al 1999), soil maps (Schlatter et al 1994(Schlatter et al , 1995, Agroclimatic map of Chile (INIA 1989) and the growth zones proposed by Donoso et al (1993).…”

Section: Introductionmentioning

confidence: 99%

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Exploring stand and tree variability in mixed Nothofagus second-growth forests through multivariate analyses

et al. 2018

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Second-growth forests of Nothofagus obliqua (roble), N. alpina (raulí) and N. dombeyi (coihue), known locally as RO-RA-CO forest type, are among the most important natural mixed forest types of Chile. Several studies have identified a wide range of factors that could influence both stand and tree variability found in these forests. To better characterize potential tree-and stand-level factors that are associated with RO-RA-CO variability, and that are available in typical forest inventories, several unsupervised multivariate statistical methods were evaluated: 1) non-metric multidimensional scaling (NMDS); 2) principal coordinates analysis (PCoA); and 3) principal component analysis (PCA). The data used in this study originated from a sample of 158 plots consisting of two plot networks that covered the full geographic area of the RO-RA-CO forest type in Chile. We found that site productivity and growth zones did not explain the differences within the sampled population. However, stand development stages, tree-to-tree competition, and tree-size attributes were critical variables with a high percentage of variance explained using PCA, ranging from 61 % to 67 %. In addition, for the PCoA analysis, the variable stand density is important, with ~78 % variance explained.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Exploring stand and tree variability in mixed Nothofagus second-growth forests through multivariate analyses

et al. 2018

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“…Other studies also have found contrasting differences in growth between Nothofagus species and growth zones [5,9,10,[59][60][61][62][63][64]. The incorporation of species and/or zone factors to improve growth models has been previously reported [24,25].…”

Section: Discussionmentioning

confidence: 99%

Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth Forests in Southern Chile

Moreno

Palmas

Escobedo

et al. 2017

Forests

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Second growth forests of Nothofagus obliqua (roble), N. alpina (raulí), and N. dombeyi (coihue), known locally as RORACO, are among the most important native mixed forests in Chile. To improve the sustainable management of these forests, managers need adequate information and models regarding not only existing forest conditions, but their future states with varying alternative silvicultural activities. In this study, an individual-tree diameter growth model was developed for the full geographical distribution of the RORACO forest type. This was achieved by fitting a complete model by comparing two variable selection procedures: cross-validation (CV), and least absolute shrinkage and selection operator (LASSO) regression. A small set of predictors successfully explained a large portion of the annual increment in diameter at breast height (DBH) growth, particularly variables associated with competition at both the tree-and stand-level. Goodness-of-fit statistics for this final model showed an empirical coefficient of correlation (R 2 emp) of 0.56, relative root mean square error of 44.49% and relative bias of −1.96% for annual DBH growth predictions, and R 2 emp of 0.98 and 0.97 for DBH projection at 6 and 12 years, respectively. This model constitutes a simple and useful tool to support management plans for these forest ecosystems.

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“…La superficie total abarca 5.663.248 hectáreas y con una altitud desde el nivel del mar hasta 2.896 m snm. Esta área geográfica posee una gran proporción de bosques nativos (CONAF 2011), especialmente con características que des-tacan por sus tasas de crecimiento y accesibilidad (Echeverría y Lara 2004, Esse et al 2013. Los tipos forestales, de acuerdo a Donoso (1994), presentes en el área de estudio son: roble-raulí-coigüe, coigüe-raulí-tepa, siempreverde, lenga, araucaria, alerce, ciprés de la cordillera y ciprés de Las Guaitecas, cada uno de los cuales está clasificado en sus correspondientes subtipos forestales.…”

Section: Métodosunclassified

“…Los tipos forestales, de acuerdo a Donoso (1994), presentes en el área de estudio son: roble-raulí-coigüe, coigüe-raulí-tepa, siempreverde, lenga, araucaria, alerce, ciprés de la cordillera y ciprés de Las Guaitecas, cada uno de los cuales está clasificado en sus correspondientes subtipos forestales. Para la estimación de la biomasa disponible se consideraron sólo los tipos forestales con mayor superficie y accesibilidad, así como posibilidad de intervenirlos silviculturalmente de acuerdo con la legislación actual (Echeverría y Lara 2004, Esse et al 2013, Pilquinao 2013): roble-raulí-coigüe, coigüe, raulí-tepa y siempreverde, los cuales representan un 78 % de la superficie total de bosque nativo del área de estudio.…”

Section: Métodosunclassified

Disponibilidad y potencial energético de la biomasa del bosque nativo para el desarrollo de la dendroenergía en el centro-sur de Chile

et al. 2015

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SUMMARYForest biomass is one of the main alternatives that Chile could promote to supply the long-term demand of energy, which can help to diversify the national energy offer. In this study we assessed the biomass availability from native forests, considering biomass extraction based on silvicultural management and environmental and legal restrictions in three regions of south-central Chile: La Araucanía, Los Ríos and Los Lagos. Based on the proposed scenario, the potential area of forest biomass decreased from 1,330,460 to 754,435 ha and the estimated forest biomass reached 31 Gg. According to these results, the electric and calorific potential energy is 26 GWh and 54 GWh, respectively. In a simulated scenario where the annual management represents 5 % of the available biomass area (37,000 ha year -1 ), the energy would satisfy the demand of more than 700 thousand homes. The use of forest biomass for energy production has several advantages which produce economic, social and environmental positive impacts. A key strategy for the development of this activity is related to the incentive to manage the native forests, which are mainly property of small and medium land owners. Further research on this topic should explicitly consider issues as spatial and temporal scale, accessibility, biomass quality, and socio-economic conditions of land owners.Key words: forest biomass, dendroenergy, non-conventional renewable energy, forest management, calorific value. RESUMENEl uso de biomasa forestal para la producción de energía eléctrica representa una de las alternativas que Chile podría utilizar para suplir la demanda de energía en el largo plazo, propiciando una mayor diversificación en la matriz energética. Este estudio cuantificó la disponibilidad de biomasa forestal de bosque nativo en las regiones de La Araucanía, Los Ríos y Los Lagos del centro-sur de Chile. Se consideró una extracción basada en intervenciones silviculturales, restricciones ambientales y legales, estimando la distribución espacial y el potencial energético de la biomasa. Al considerar las restricciones ambientales y legales, la superficie potencialmente manejable se redujo de 1.330.460 a 754.435 hectáreas, y la biomasa potencial disponible se estimó en 31 Gg. El potencial de energía eléctrica y calórica equivale a 26 GWh y 54 GWh, respectivamente. En un escenario simulado, con manejo anual de 5 % de la superficie disponible (37.000 ha año -1 ), la energía podría cubrir las necesidades energéticas (eléctrica y térmica) de más de 700.000 hogares de consumo promedio. La utilización de biomasa para producir energía tiene varias ventajas que pueden generar impactos positivos (económicos, sociales y ambientales). Una estrategia clave para el desarrollo de la actividad está ligada al incentivo para el manejo del bosque nativo, que se encuentra mayormente en manos de pequeños y medianos propietarios. Futuras investigaciones en esta materia deberían considerar explícitamente aspectos de escala espacial y temporal, accesibilidad, calidad de biomasa y condicion...

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Determination of homogeneous edaphoclimatic zones for the secondary forests of Nothofagus dombeyi in central-southern Chile

Cited by 9 publications

References 16 publications

Exploring stand and tree variability in mixed Nothofagus second-growth forests through multivariate analyses

Exploring stand and tree variability in mixed Nothofagus second-growth forests through multivariate analyses

Individual-Tree Diameter Growth Models for Mixed Nothofagus Second Growth Forests in Southern Chile

Disponibilidad y potencial energético de la biomasa del bosque nativo para el desarrollo de la dendroenergía en el centro-sur de Chile

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