Christian Salas Eljatib
Universidad de La Frontera, Ciencias Forestales, Faculty Member
The file "rauliData.dat" contains information on time series data of height for <i>Nothofagus alpina</i> sampled tress in south-central Chile. These sample trees are part of the ones used in the following... more
The file "rauliData.dat" contains information on time series data of height for <i>Nothofagus alpina</i> sampled tress in south-central Chile. These sample trees are part of the ones used in the following article:<br>- Salas-Eljatib C. 2021. An approach to quantify climate-productivity relationships: an example from a widespread <i>Nothofagus </i>forest. Ecological Applications (In Press)<br>The data columns are as follows: <br>1. tree.code: tree id code2. spp: species common name3. bha.t : breast-height age, in yrs.4. h.t: total height, in m.<br>If you want to read this datafile in the software R, simply type at the console the following syntax:<br>df head(df)str(df)<br><br>For any questions, please refer to:<br><b>Christian Salas-Eljatib</b>Email: cseljatib AT gmail DOT comweb: www.eljatib.com<br>
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Raulí (Nothofagus alpina (Poepp. & Endl.)) and Ulmo (Eucryphia cordifolia Cav.) are mid-tolerant tree species in the Coihue-Raulí-Tepa (ca. 0.55 mill ha) and Evergreen (ca. 4.1 mill ha) forest types in south-central Chile, respectively.... more
Raulí (Nothofagus alpina (Poepp. & Endl.)) and Ulmo (Eucryphia cordifolia Cav.) are mid-tolerant tree species in the Coihue-Raulí-Tepa (ca. 0.55 mill ha) and Evergreen (ca. 4.1 mill ha) forest types in south-central Chile, respectively. These species have been selectively logged in old-growth forests especially during the 20th century, Raulí mostly for its highly valuable timber, and Ulmo for its highly demanded firewood and bark for the tannery industry. Natural regeneration of these species occurs mostly through canopy gaps, but it can be retarded, or even inhibited, when the cover of the understory vegetation becomes unusually dense, such as in high-graded forests. Although underplanting is possible for these species, the knowledge about their growth in forest understories is scarce, and necessary to inform restoration programs. Therefore, we evaluated short-term responses (two years) of underplanted containerized seedlings in root-collar diameter, height, stem volume, and in the...
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Research Interests: Plant Biology and Ecology
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In this analysis, a method for construction of forest canopy three-dimensional (3D) models from terrestrial LiDAR was used for assessing the influence of structural changes on reflectance for an even-aged forest in Belgium. The necessary... more
In this analysis, a method for construction of forest canopy three-dimensional (3D) models from terrestrial LiDAR was used for assessing the influence of structural changes on reflectance for an even-aged forest in Belgium. The necessary data were extracted by the developed method, as well as it was registered the adjacent point-clouds, and the canopy elements were classified. Based on a voxelized approach, leaf area index (LAI) and the vertical distribution of leaf area density (LAD) of the forest canopy were derived. Canopy–radiation interactions were simulated in a ray tracing environment, giving suitable illumination properties and optical attributes of the different canopy elements. Canopy structure was modified in terms of LAI and LAD for hyperspectral measurements. It was found that the effect of a 10% increase in LAI on NIR reflectance can be equal to change caused by translating 50% of leaf area from top to lower layers. As presented, changes in structure did affect vegetat...
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Data from a 1 ha permanent sample plot in an old-growth Nothofagus obliqua dominated forest were used to study spatial patterns of dead and live trees using the Ripley’s K(t)K(t) function. Univariate and bivariate analyses were conducted.... more
Data from a 1 ha permanent sample plot in an old-growth Nothofagus obliqua dominated forest were used to study spatial patterns of dead and live trees using the Ripley’s K(t)K(t) function. Univariate and bivariate analyses were conducted. We computed confidence envelopes for a random (Poisson) spatial distribution using Monte Carlo simulations. An edge effect correction was applied. The spatial pattern of Aextoxicon punctatum (the dominant species) changed from a random distribution at short spatial intervals of analysis to a clustered distribution at broader spatial scales. N. obliqua appeared to be more regularly distributed, but was not statistically significantly different from a random distribution at 95% confidence. There was a negative interaction (i.e. repulsion) between shorter (generally younger than 100 years) and taller (generally older than 250 years) trees. On the other hand, there was a positive interaction (i.e. attraction) between shorter, younger trees and standing dead trees.