Abstract
A thinning experience was carried out in a Scots pine natural regeneration stand in the Central range with a site index of 23, according to the quality curves given by Rojo and Montero (1996). The age of the stand at the beginning of the experience (1971) was 35 years, and 60 years at the last inventory (1996). The statistical design of the trial was a randomised complete block with four treatments and three blocks. One treatment was a control or unthinned (A), and the other three were low thinning with different intensities: light (C), moderate (D) and heavy (E) thinnings. In this work, effects of these treatments on stand yield, mean tree and stand structure are studied. Results showed that with the heaviest thinning the total yield of the stand was a bit lower than in control treatment. This lost in production was imperceptible at early ages, so heavy thinning should be applied when stand is still young. According to these results the heaviest treatment of the trial is near the lower density limit for this species (critical basal area of Assmann). On the other hand, mean tree and stand structure characteristics became more suitable for increasing stand stability when thinning were heavy. The grater the intensity of thinning, the lesser the h/d ratio and the larger the square mean diameter. Moreover, more dominated and dying trees are removed. As conclusion we recommend low heavy thinning in early ages, reducing the intensity with age. Specially in stands of middle and high quality, the first thinning should be early, for instance at 20-25 years.
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Claims 10
Claim · model-written summary
The heaviest thinning gave a total stand yield a bit lower than the unthinned control.
- Taxon
- Scots pine (Pinus sylvestris L.)
Pinus sylvestrist0 - Treatment
- heaviest thinninge1
- Outcome
- total yield of the stande1
- Direction
- lowere1
- Comparator
- control treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e1“Results showed that with the heaviest thinning the total yield of the stand was a bit lower than in control treatment”
Claim · model-written summary
The lost production from heavy thinning was imperceptible at early ages.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Outcome
- lost in productione2
- Qualifier
- imperceptible at early agese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e2“This lost in production was imperceptible at early ages”
Claim · model-written summary
The heaviest treatment is near the lower density limit for the species (critical basal area of Assmann).
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Treatment
- heaviest treatmente3
- Outcome
- lower density limite3
- Qualifier
- critical basal area of Assmanne3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e3“the heaviest treatment of the trial is near the lower density limit for this species (critical basal area of Assmann)”
Claim · model-written summary
Heavy thinning made mean tree and stand structure more suitable for increasing stand stability.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Treatment
- when thinning were heavye4
- Outcome
- stand structure characteristicse4
- Direction
- became more suitablee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e4“mean tree and stand structure characteristics became more suitable for increasing stand stability when thinning were heavy”
Claim · model-written summary
Greater thinning intensity lowered the h/d ratio.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Treatment
- intensity of thinninge5
- Outcome
- h/d ratioe5
- Direction
- lessere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e5“The grater the intensity of thinning, the lesser the h/d ratio and the larger the square mean diameter”
Claim · model-written summary
Greater thinning intensity increased the square mean diameter.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Treatment
- intensity of thinninge5
- Outcome
- square mean diametere5
- Direction
- largere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e5“The grater the intensity of thinning, the lesser the h/d ratio and the larger the square mean diameter”
Claim · model-written summary
Heavier thinning removed more dominated and dying trees.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Outcome
- dominated and dying treese6
- Direction
- moree6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e6“Moreover, more dominated and dying trees are removed”
Claim · model-written summary
Low heavy thinning in early ages is recommended, reducing the intensity with age.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Outcome
- low heavy thinning in early agese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e7“As conclusion we recommend low heavy thinning in early ages, reducing the intensity with age”
Claim · model-written summary
The first thinning in middle and high quality stands should be early, for instance at 20-25 years.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Outcome
- first thinninge1
- Qualifier
- for instance at 20-25 yearse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e1“Specially in stands of middle and high quality, the first thinning should be early, for instance at 20-25 years”
Claim · model-written summary
Heavy thinning should be applied when the stand is still young.
- Taxon
- Scots pine (Pinus sylvestris L.)Pinus sylvestrist0
- Outcome
- heavy thinninge1
- Qualifier
- when stand is still younge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots pine (Pinus sylvestris L.)”
e1“so heavy thinning should be applied when stand is still young”
The same questions in other papers
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See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.