Abstract
The Mesopotamia region comprises the largest Eucalyptus grandis plantation area in Argentina. Stand density ranges from 1,000 to 1,111 plants/ha and 10-12 years rotation lenghts allow for a variety of end uses: pulp, sawmill, poles. Stand density effects on E. grandis growth were evaluated in a trial network across the Entre Ríos province. Three Nelder-designed trials were periodically measured for DBH and height up to age ten years. With increasing density, basal area decreased and DBH, mean height and survival increased; quadratic regression equations indicated that spacing explained 60 to 76 p. 100 of the variation in DBH and basal area. Results allow for the following management recommendations; stand density has to be decreased in low quality sites; when a larger DBH is the objective, stand density has to be lower and/or rotation length has to be increased and/or thinnings have to be applied; to produce larger DBHs than those currently consumed by sawmills will require a lower initial stand density or intermediate thinnings; a maximization of the final stand volume will be obtained with higher stand densities than those currently used.
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Claims 6
Claim · model-written summary
Basal area decreased with increasing stand density.
- Taxon
- Eucalyptus grandis
Eucalyptus grandist0 - Outcome
- basal areae0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing density, basal area decreased”
t0“Eucalyptus grandis”
Claim · model-written summary
DBH, mean height and survival increased with density.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Outcome
- DBH, mean height and survivale0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DBH, mean height and survival increased”
t0“Eucalyptus grandis”
Claim · model-written summary
Spacing explained 60 to 76 percent of DBH and basal area variation.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Outcome
- variation in DBH and basal areae0
- Value
- 60 to 76 p. 100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spacing explained 60 to 76 p. 100 of the variation in DBH and basal area”
t0“Eucalyptus grandis”
Claim · model-written summary
Stand density should decrease on low quality sites.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Outcome
- stand density has to be decreased in low quality sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stand density has to be decreased in low quality sites”
t0“Eucalyptus grandis”
Claim · model-written summary
Larger DBH requires lower density, longer rotation or thinning.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Outcome
- stand density has to be lower and/or rotation length has to be increased and/or thinnings have to be appliede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when a larger DBH is the objective, stand density has to be lower and/or rotation length has to be increased and/or thinnings have to be applied”
t0“Eucalyptus grandis”
Claim · model-written summary
Maximum final volume requires higher densities than presently used.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Outcome
- higher stand densities than those currently usede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a maximization of the final stand volume will be obtained with higher stand densities than those currently used”
t0“Eucalyptus grandis”