Abstract
Abstract A crop tree management study targeting green ash ( Fraxinus pennsylvanica Marsh.) was established in a 16-year-old, naturally regenerated, mixed-species, bottomland hardwood stand in southwest Tennessee. The goal was to maintain or improve ascendance of green ash into the overstory of a developing stand that otherwise might not occur. Three treatments were examined: a complete crown-touching release; the same release treatment along with a one-time, fertilizer application; and a control. Initial diameters, heights and crown size parameters were measured in 1996 and 18 years later. The two release treatments did not differ significantly in diameter and height growth response, but statistically outperformed the control treatment. Similarly, crown class scores did not differ between the two release treatments, but were significantly improved from the control. Both release treatments displayed a greater percentage of crop trees successfully competing for upper canopy status compared to the control. Using initial tree diameter as a reflection of crown size and position of crop trees, diameters of 12.5 to 20 cm were more likely to be a component of the overstory 18 years following crop tree treatments. Crop trees less than 12.5 cm in diameter were likely to remain in the subordinate crown classes. Trees greater than 20 cm in diameter were already in the overstory and maintained their upper canopy position. These results suggest that crop tree management can be an effective management tool for improving growth as well as improving overstory presence of green ash in pole-sized, mixed-species, bottomland hardwood stands.
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Claims 8
Claim · model-written summary
The two release treatments did not differ significantly in diameter and height growth.
- Taxon
- green ash
Fraxinus pennsylvanicat0 - Treatment
- two release treatmentse0
- Outcome
- diameter and height growth responsee0
- Direction
- did not differe0
- Comparator
- two release treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two release treatments did not differ significantly in diameter and height growth response, but statistically outperformed the control treatment”
t0“Green Ash”
Claim · model-written summary
Both release treatments outperformed control for diameter and height growth.
- Taxon
- green ashFraxinus pennsylvanicat0
- Treatment
- two release treatmentse0
- Outcome
- diameter and height growth responsee0
- Direction
- outperformede0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two release treatments did not differ significantly in diameter and height growth response, but statistically outperformed the control treatment”
t0“Green Ash”
Claim · model-written summary
Crown class scores did not differ between release treatments.
- Taxon
- green ashFraxinus pennsylvanicat0
- Treatment
- two release treatmentse0
- Outcome
- crown class scorese0
- Direction
- did not differe0
- Comparator
- two release treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crown class scores did not differ between the two release treatments, but were significantly improved from the control”
t0“Green Ash”
Claim · model-written summary
Release treatments improved crown class scores versus control.
- Taxon
- green ashFraxinus pennsylvanicat0
- Treatment
- two release treatmentse0
- Outcome
- crown class scorese0
- Direction
- improvede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crown class scores did not differ between the two release treatments, but were significantly improved from the control”
t0“Green Ash”
Claim · model-written summary
Release treatments increased the percentage of crop trees competing for upper canopy status.
- Taxon
- green ashFraxinus pennsylvanicat0
- Treatment
- release treatmentse0
- Outcome
- percentage of crop trees successfully competing for upper canopy statuse0
- Direction
- greatere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both release treatments displayed a greater percentage of crop trees successfully competing for upper canopy status compared to the control”
t0“Green Ash”
Claim · model-written summary
Initial diameters of 12.5 to 20 cm predicted overstory presence after 18 years.
- Taxon
- green ashFraxinus pennsylvanicat0
- Treatment
- crop tree treatmentse0
- Outcome
- component of the overstorye0
- Direction
- more likelye0
- Qualifier
- diameters of 12.5 to 20 cme0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diameters of 12.5 to 20 cm were more likely to be a component of the overstory 18 years following crop tree treatments”
t0“Green Ash”
Claim · model-written summary
Trees under 12.5 cm diameter were likely to stay in subordinate crown classes.
- Taxon
- green ashFraxinus pennsylvanicat0
- Outcome
- subordinate crown classese0
- Qualifier
- less than 12.5 cm in diametere0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop trees less than 12.5 cm in diameter were likely to remain in the subordinate crown classes”
t0“Green Ash”
Claim · model-written summary
Trees over 20 cm diameter maintained upper canopy position.
- Taxon
- green ashFraxinus pennsylvanicat0
- Outcome
- upper canopy positione0
- Qualifier
- greater than 20 cm in diametere0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trees greater than 20 cm in diameter were already in the overstory and maintained their upper canopy position”
t0“Green Ash”