Abstract
Populations of lodgepole pine (Pinus contorta var latifolia Engelm) and sunflower (Heltanthus annuus L) were examined to compare the influence of stand density on canopy structure and the association between canopy structure and the production of stem volume The plastic responses of canopy structure to competitive interactions indicated that the structural dynamics of lodgepole pine and sunflower populations were similar, though the degree of plastic response differed The influence of canopy structure on the production of stem volume, however, was fundamentally different efficiency decreased as the mean crown size of lodgepole pine populations increased, but this decrease did not occur in sunflower populations This difference was attributed to the large accumulation of branch biomass required to display foliage effectively in the canopies of the perennial lodgepole pine, accumulation which does not occur in the annual sunflower
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Lodgepole pine and sunflower had similar canopy structural dynamics under competition but different degrees of plastic response.
- Taxon
- lodgepole pine
Pinus contortae0 - Outcome
- structural dynamicse0
- Comparator
- sunflowere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plastic responses of canopy structure to competitive interactions indicated that the structural dynamics of lodgepole pine and sunflower populations were similar, though the degree of plastic response differed”
Claim · model-written summary
Stem volume production efficiency declined as mean crown size increased in lodgepole pine.
- Taxon
- lodgepole pinePinus contortae0
- Organ / stage
- crowne0
- Outcome
- efficiencye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“efficiency decreased as the mean crown size of lodgepole pine populations increased, but this decrease did not occur in sunflower populations”
Claim · model-written summary
Stem volume production efficiency did not decline with mean crown size in sunflower.
- Taxon
- sunflower
Helianthus annuuse0 - Organ / stage
- crowne0
- Outcome
- efficiencye0
- Direction
- did not occure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“efficiency decreased as the mean crown size of lodgepole pine populations increased, but this decrease did not occur in sunflower populations”
Claim · model-written summary
The authors attributed the pine efficiency decline to branch biomass accumulation needed for foliage display.
- Taxon
- lodgepole pinePinus contortae0
- Outcome
- large accumulation of branch biomasse0
- Qualifier
- required to display foliage effectivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This difference was attributed to the large accumulation of branch biomass required to display foliage effectively in the canopies of the perennial lodgepole pine, accumulation which does not occur in the annual sunflower”