Paper · 2019 · Revista Árvore

MECHANICAL STABILITY OF THE Cabralea canjerana SAPLINGS SUBMITED TO LIBERATION IN SECONDARY FOREST, RS, BRAZIL

Anna Paula Lora Zimmermann; Frederico Dimas Fleig; Thomas Schroder

4
claims
8
verbatim quotes
0
citations
4
research areas
✓
Open access · cc-by

Abstract

ABSTRACT The liberation of trees of interest by cutting competing trees, woody vines and other lianas is a very important silvicultural practice in the management of forest species of interest present in secondary forests. Thus, we aimed to know the influence of the liberation on the mechanical stability and what dimensional height limit of C. canjerana (Vell.) Mart. saplings must have so that there is no problem of buckling of the stem after the liberation. To this end, the liberation of 105 plants of the species was carried out and the diameter and height were measured before and annually for three years after the application of the treatment. Based on the Mechanical Design Theory, a regression model was generated to know to allocation mode of the diameter and height in the analized plants. The minimum diameter for buckling and the safety factor for all trees were calculated. The liberation resulted in the buckling of the stem of five trees, all below the safety limit, that is, with a real diameter smaller than the minimum diameter to support the weight of its height. According to the regression model generated the species grows proportionally in diameter and height. However, the liberation influenced the mechanical stability of the plants liberated, making a greater increment in diameter necessary so that the trees remained standing. The results demonstrate that the dimensions of the trees to be liberated should be considered in order to avoid problems of buckling of the stem after the treatment.

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Claims 4

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Liberation led to stem buckling in five trees below the safety diameter limit.

Taxon
Cabralea canjeranaCabralea canjeranat0
Treatment
liberatione0
Outcome
buckling of the steme0
Value
five treese0
Qualifier
real diameter smaller than the minimum diametere0

Not reportedComparatorDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Cabralea canjerana
Cabralea canjerana · TaxonDick Culbert from Gibsons, B.C., Canada · CC BY 2.0 · Wikimedia Commons ↗

Verbatim

e0

“The liberation resulted in the buckling of the stem of five trees, all below the safety limit, that is, with a real diameter smaller than the minimum diameter to support the weight of its height.”

✓ located verbatim in the source · abstract, characters 891–1086 · show in text ↑
t0

“Cabralea canjerana”

✓ located verbatim in the source · title, characters 28–46 · show in text ↑
Method / resourceobservedoriginal resultsimulated

Claim · model-written summary

The regression model indicated proportional diameter and height growth.

Taxon
Cabralea canjeranaCabralea canjeranat0
Outcome
grows proportionally in diameter and heighte0
Comparator
diameter and heighte0

Not reportedDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Cabralea canjerana
Cabralea canjerana · TaxonDick Culbert from Gibsons, B.C., Canada · CC BY 2.0 · Wikimedia Commons ↗

Verbatim

e0

“According to the regression model generated the species grows proportionally in diameter and height.”

✓ located verbatim in the source · abstract, characters 1087–1187 · show in text ↑
t0

“Cabralea canjerana”

✓ located verbatim in the source · title, characters 28–46 · show in text ↑
Intervention effectauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

Liberation altered sapling stability such that greater diameter increment was needed to remain standing.

Taxon
Cabralea canjeranaCabralea canjeranat0
Treatment
liberatione0
Outcome
mechanical stabilitye0
Qualifier
greater increment in diameter necessarye0

Not reportedComparatorDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Cabralea canjerana
Cabralea canjerana · TaxonDick Culbert from Gibsons, B.C., Canada · CC BY 2.0 · Wikimedia Commons ↗

Verbatim

e0

“the liberation influenced the mechanical stability of the plants liberated, making a greater increment in diameter necessary so that the trees remained standing.”

✓ located verbatim in the source · abstract, characters 1197–1358 · show in text ↑
t0

“Cabralea canjerana”

✓ located verbatim in the source · title, characters 28–46 · show in text ↑
Recommendationauthor interpretationoriginal resultpositivebasis n/a

Claim · model-written summary

Tree dimensions should be considered before liberation to avoid stem buckling.

Taxon
Cabralea canjeranaCabralea canjeranat0
Outcome
dimensions of the trees to be liberated should be considerede0

Not reportedDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Cabralea canjerana
Cabralea canjerana · TaxonDick Culbert from Gibsons, B.C., Canada · CC BY 2.0 · Wikimedia Commons ↗

Verbatim

e0

“The results demonstrate that the dimensions of the trees to be liberated should be considered in order to avoid problems of buckling of the stem after the treatment.”

✓ located verbatim in the source · abstract, characters 1359–1524 · show in text ↑
t0

“Cabralea canjerana”

✓ located verbatim in the source · title, characters 28–46 · show in text ↑