Skip to Main Content
Intensity of precommercial crop-tree release increases diameter and crown growth in upland hardwoodsAuthor(s): Jeffrey S. Ward
Source: In: Gottschalk, Kurt W.; Fosbroke, Sandra L. C., ed. Proceedings, 10th Central Hardwood Forest Conference; 1995 March 5-8; Morgantown, WV.: Gen. Tech. Rep. NE-197. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 388-398
Publication Series: General Technical Report (GTR)
Station: Northeastern Research Station
PDF: View PDF (1.38 MB)
DescriptionIn 1988 seven study areas were established in Connecticut to examine the effects of precommercial crop tree release on bole and crown growth. Each study area has 27 8x8 m plots centered on a northern red oak, black oak, or scarlet oak identified as a potential crop-tree (PCT). The 27 plots at each study area were divided into 3 treatments: no cutting, removal of all stems with crowns within 1 m of the crown of a PCT, and removal of all stems with crowns within 1 m of the crowns of a PCT and 2 other potential crop-trees. After cutting, 7191 stems remained. A consequence of crop-tree release is the partial release of trees surrounding crop-trees. The percentage of release of these surrounding trees was assessed in 25% increments. Diameter growth increased with amount of release and crown class. Relative to unreleased trees, 4-yr diameter growth of northern red oak increased by 86%, black/scarlet oak by 65%, red maple by 56%, and black birch by 52%. Release slowed height growth of dominant and codominant oaks for only the first 2 yr. In sapling stands with few oaks in upper canopy positions, precommercial release could be used to augment oak density. Survival and diameter growth of oaks in the intermediate and suppressed crown classes increased with release intensity. Release also increased height growth of northern red oak in the suppressed crown classes.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationWard, Jeffrey S. 1995. Intensity of precommercial crop-tree release increases diameter and crown growth in upland hardwoods. In: Gottschalk, Kurt W.; Fosbroke, Sandra L. C., ed. Proceedings, 10th Central Hardwood Forest Conference; 1995 March 5-8; Morgantown, WV.: Gen. Tech. Rep. NE-197. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 388-398
- Weight, volume, and physical properties of major hardwood species in the Southern Appalachian mountains
- Stem quality of oak in 15-year-old stands: influence of species within harvesting treatment and fencing
- Silvical characteristics of the five upland oaks
XML: View XML