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Forestry
From Page B1
grown in the county.
Five guidelines
In his presentation exploring the “Five Guidelines for Sustainable Forest Management,” arborist and forester Lyt Wood emphasized overall forest health. For a nearby example of a less-than-healthy forest, Wood cited the Shenandoah National Park forest atop Thornton Gap, ravaged in recent history by fire, gypsy moths, ice, high winds, and by Oriental Bittersweet and the herbicides used to control it.
Wood’s first guideline is to assess the site and then select tree species appropriate to the site, not the other way around. Secondly, the sustainable forester works with, rather than against, the flow of succession, in which open land is succeeded by trees that seed in full sunlight, followed by shade-loving hardwoods. With a mixed stand of hardwoods and Virginia pines, for example, cutting the pines out works with the flow of succession by removing “pioneer” trees that don’t five very long.
Wood distinguished between alternative harvesting approaches, including clear cut, selective cut, and group cut. While “clear cutting” has become a “dirty word,” according to Wood, in some cases, for example with a pure stand of Virginia pine, the only reasonable way to harvest these short-lived, shallow-rooted trees is with a clear cut, followed by replacement. Clear
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