Diameters Of Clearcut Openings Influence Central Appalachian Hardwood Stem Development
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Size of Clearcut Opening Affects Species Composition, Growth Rate and Stand Characteristics
Author | : Martin E. Dale |
Publisher | : |
Total Pages | : 28 |
Release | : 1995 |
Genre | : Clearcutting |
ISBN | : |
In the late 1950's and early 1960's, a series of studies was installed in the central hardwood forest to determine if size of clearcut opening affects the growth rate and species composition of new stands. In 1991, about 30 years after cutting, stand data were collected in 89 openings ranging in size from 0.04 to 1.61 acres. Species composition varied from locations in West Virginia to those in Illinois and from Ohio to Kentucky. For example, there were more maple and birch in West Virginia than in Illinois, regardless of opening size. Some of the difference in species composition and growth rate is related to site quality but there also are differences due to size of opening. Most of the oak and hickory were on the poorer sites while yellow-poplar was more abundant on the better sites. The number of stems per acre increased with opening size; however, the number of stems of shade-tolerant species constituted a greater proportion of the stand in small openings (
Method for Applying Group Selection in Central Appalachian Hardwoods
Author | : Gary W. Miller |
Publisher | : |
Total Pages | : 16 |
Release | : 1995 |
Genre | : Clearing of land |
ISBN | : |
Public concern over the adverse visual impact of clearcutting has heightened interest in developing and testing alternative regeneration practices for central Appalachian hardwoods. When applied properly, group selection, which entails making small openings within a timber stand at regular intervals, can meet aesthetic goals while providing suitable light conditions to reproduce shade-intolerant species. Volume control and residual stand density are used to regulate periodic cuts, which include volume removed to create openings plus volume removed between openings to improve the quality and distribution of the residual stand. In central Appalachian hardwoods, openings must have a minimum size of 0.4 acre; all stems 1.0 inch d.b.h. and larger are cut to reproduce desirable shade-intolerant species. Maximum opening size is based on aesthetic requirements or other management constraints. Where reproduction of shade-intolerant species is acceptable, openings can be as small as a space occupied by a few trees. Openings should be located using the worst first approach to give the growing space occupied by mature trees or risky trees to faster growing, desirable regeneration. The residual stand between openings should be improved by cutting poor quality or high-risk trees. The recommended residual basal area in sawtimber-size trees (11.0 inches d.b.h. and larger) is related to northern red oak site index (SI): 70 to 85 ft2/acre for SI 80.55 to 70 ft2/acre for SI 70, and 40 to 55 ft2/acre for SI 80. These field-tested methods can help forest managers initiate group selection in second-growth Appalachian hardwoods. Guidelines are presented for computing the cut, determining size, location, and number of openings, and marking the stand.
Agriculture Handbook
Author | : |
Publisher | : |
Total Pages | : 200 |
Release | : 1949 |
Genre | : Agriculture |
ISBN | : |
Set includes revised editions of some issues.