Abstract
Within a 53-year-old Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) plantation, replicated thinning and fertilization plots were examined for responses in stem growth, leaf area, and stem growth per unit leaf area. Although measurements occurred 20–30 years after plot installation, substantial effects from the various treatment levels were still present. Thinning reduced leaf area of the stands but increased stem growth per unit of leaf area, resulting in little difference in stem growth per hectare over the 5-year measurement period (1977–1981). Fertilization increased both stand leaf area and stem growth per unit leaf area, and more than doubled 5-year stem growth per hectare. Consideration of the role of leaf area and stem growth per unit leaf area in determining stand treatment responses may account for much of the variation found among replicates of treatments or between studies on different sites.
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Claims 6
Claim · model-written summary
Thinning reduced stand leaf area.
- Taxon
- Douglas-fir
Pseudotsuga menziesiit0 - Treatment
- Thinninge0
- Outcome
- leaf area of the standse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thinning reduced leaf area of the stands but increased stem growth per unit of leaf area, resulting in little difference in stem growth per hectare over the 5-year measurement period (1977–1981).”
t0“Douglas-fir”
Claim · model-written summary
Thinning increased stem growth per unit leaf area.
- Taxon
- Douglas-firPseudotsuga menziesiit0
- Treatment
- Thinninge0
- Outcome
- stem growth per unit of leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thinning reduced leaf area of the stands but increased stem growth per unit of leaf area, resulting in little difference in stem growth per hectare over the 5-year measurement period (1977–1981).”
t0“Douglas-fir”
Claim · model-written summary
Thinning yielded little difference in stem growth per hectare.
- Taxon
- Douglas-firPseudotsuga menziesiit0
- Treatment
- Thinninge0
- Outcome
- stem growth per hectaree0
- Direction
- little differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thinning reduced leaf area of the stands but increased stem growth per unit of leaf area, resulting in little difference in stem growth per hectare over the 5-year measurement period (1977–1981).”
t0“Douglas-fir”
Claim · model-written summary
Fertilization increased stand leaf area.
- Taxon
- Douglas-firPseudotsuga menziesiit0
- Treatment
- Fertilizatione0
- Outcome
- stand leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization increased both stand leaf area and stem growth per unit leaf area, and more than doubled 5-year stem growth per hectare.”
t0“Douglas-fir”
Claim · model-written summary
Fertilization increased stem growth per unit leaf area.
- Taxon
- Douglas-firPseudotsuga menziesiit0
- Treatment
- Fertilizatione0
- Outcome
- stem growth per unit leaf areae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization increased both stand leaf area and stem growth per unit leaf area, and more than doubled 5-year stem growth per hectare.”
t0“Douglas-fir”
Claim · model-written summary
Fertilization more than doubled five-year stem growth per hectare.
- Taxon
- Douglas-firPseudotsuga menziesiit0
- Treatment
- Fertilizatione0
- Outcome
- 5-year stem growth per hectaree0
- Direction
- more than doublede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization increased both stand leaf area and stem growth per unit leaf area, and more than doubled 5-year stem growth per hectare.”
t0“Douglas-fir”
The same questions in other papers
pruning · growth · Pseudotsuga menziesii (Douglas-fir)Positive and negative results
1 in the opposite direction
- negative
fertilization · growth · Pseudotsuga menziesii (Douglas-fir)Positive and negative results
11 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
9 papers more in this group
See all 13 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.