Abstract
Resprouting after harvest and rapid growth of sprouts are often considered essential for success of close-spaced, short-rotation cultural systems. This study examined resprouting, subsequent growth, and dry weight production following the initial 4-year harvest of a "common garden" trial of 50 clones of Populustrichocarpa Torr. & Gray. The clones were selected from 10 populations (sources) from major river drainages from western British Columbia, Washington, and Oregon. Additionally, three P. trichocarpa × P. deltoides (Bartr.) hybrids, a 'Robusta' clone, and a previously selected P. trichocarpa clone from Cottage Grove, Oregon, were included in the experiment. Mean yield of P. trichocarpa clones was 11.3 Mg•ha −1 •year −1 (CV among clones = 61%) in the coppice rotation vs. 12.6 Mg•ha −1 •year −1 (CV among clones = 40%) in the initial rotation; a difference that may, at least in part, be due to the use of less fertilizer in the coppice rotation. Nevertheless, a number of clones including the hybrids had higher yields in the coppice than in the initial rotation. Yield of clones in the coppice rotation was only moderately correlated with yield in the initial harvest (r 2 = 0.48), but the same two clones, hybrids 11-11 and 11-05, were the top-producing clones in both rotations. Cumulative mortality of P. trichocarpa at the end of the experiment, including failed cuttings, averaged 36%, but was highly variable (range = 7–66% among clones). Yield in both harvests differed significantly among sources of P. trichocarpa. As with other components of productivity reported earlier, performance in coppice varied significantly among the 50 P. trichocarpa clones, and more so than in the first rotation. Populustrichocarpa clones identified as superior in coppicing in this experiment represent potential parents for new hybrids intended for short-rotation systems involving coppicing.
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Claims 9
Claim · model-written summary
Mean yield of P. trichocarpa clones was lower in the coppice rotation (11.3 Mg ha-1 year-1) than in the initial rotation (12.6 Mg ha-1 year-1).
Verbatim
e1“Mean yield of P. trichocarpa clones was 11.3 Mg•ha −1 •year −1 (CV among clones = 61%) in the coppice rotation vs. 12.6 Mg•ha −1 •year −1 (CV among clones = 40%) in the initial rotation”
e2“a difference that may, at least in part, be due to the use of less fertilizer in the coppice rotation”
Claim · model-written summary
A number of clones including the hybrids had higher yields in the coppice rotation than in the initial rotation.
Verbatim
e3“a number of clones including the hybrids had higher yields in the coppice than in the initial rotation”
t0“Populustrichocarpa and its hybrids”
Claim · model-written summary
Yield of clones in the coppice rotation was only moderately correlated with yield in the initial harvest (r2 = 0.48).
- Taxon
- Populustrichocarpat0
- Outcome
- Yield of clones in the coppice rotatione4
- Value
- r 2 = 0.48e4
- Comparator
- yield in the initial harveste4
Not reportedDirection
Verbatim
e4“Yield of clones in the coppice rotation was only moderately correlated with yield in the initial harvest (r 2 = 0.48)”
t0“Populustrichocarpa and its hybrids”
Claim · model-written summary
The same two clones, hybrids 11-11 and 11-05, were the top-producing clones in both rotations.
Verbatim
e5“the same two clones, hybrids 11-11 and 11-05, were the top-producing clones in both rotations”
t0“Populustrichocarpa and its hybrids”
Claim · model-written summary
Cumulative mortality of P. trichocarpa at the end of the experiment averaged 36%, including failed cuttings.
Verbatim
e6“Cumulative mortality of P. trichocarpa at the end of the experiment, including failed cuttings, averaged 36%”
Claim · model-written summary
Cumulative mortality of P. trichocarpa was highly variable among clones, with a range of 7-66%.
Verbatim
e6“Cumulative mortality of P. trichocarpa at the end of the experiment, including failed cuttings, averaged 36%”
e7“but was highly variable (range = 7–66% among clones)”
Claim · model-written summary
Yield in both harvests differed significantly among sources of P. trichocarpa.
Not reportedDirection
Verbatim
e0“Yield in both harvests differed significantly among sources of P. trichocarpa”
Claim · model-written summary
Performance in coppice varied significantly among the 50 P. trichocarpa clones, more so than in the first rotation.
Verbatim
e0“performance in coppice varied significantly among the 50 P. trichocarpa clones, and more so than in the first rotation”
Claim · model-written summary
Populus trichocarpa clones identified as superior in coppicing are potential parents for new hybrids for short-rotation systems involving coppicing.
Verbatim
e0“Populustrichocarpa clones identified as superior in coppicing in this experiment represent potential parents for new hybrids intended for short-rotation systems involving coppicing”
The same questions in other papers
rotation · yield · Populus trichocarpa (black cottonwood)Results agree
1 paper in the same direction as this paper
- no effect
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.