• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Northern Journal of Applied Forestry >Influence of cutting method on stand growth in sawtimber oak stands.
【24h】

Influence of cutting method on stand growth in sawtimber oak stands.

机译：锯切方法对锯木栎林林分生长的影响。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Many upland oak forests in the eastern United States are approaching economic and biological maturity. A study was established in 1981-1984 in three central Connecticut forests to examine the effects of six distinct cutting methods (shelterwood, diameter limit, multiaged crop tree, high grading, silvicultural clearcut, forest preserve) on stand growth and dynamics in sawtimber oak stands. Board-foot volumes (International 1/4) averaged 8.4 mbf/ac before the initial harvest. Sixty-nine percent of sawtimber trees had butt-log grades of 2 or better. Volume growth was significantly lower on high grading plots (36 bf/ac/year) than on the forest preserve, diameter limit, shelterwood, and multiaged crop tree plots (~214 bf/ac/year) through two cutting cycles. Total board-foot yield (final volumes plus harvested volumes) for the silvicultural clearcut plots (7.3 mbf/ac) was significantly lower than for uncut, shelterwood, and diameter limit cuts, 12.3, 12.5, and 13.0 mbf/ac, respectively. This study showed that three distinct cutting methods: shelterwood, multiaged crop tree, and forest preserve resulted in similar stand volume growth rates in sawtimber oak stands. The first two methods can be used by landowners who wish to generate income to offset expenses. The choice will depend on the aesthetic and regeneration goals of the landowner. Diameter-limit cutting also had similar volume rates, but it was necessary to lower the diameter limits for the second cutting cycle to maintain economically viable harvests. As a consequence, residual stand structure after the second cutting cycle was similar to that for the high grading plots. Although high grading had the highest harvested volume during the first cutting cycle, low quality of residual trees and depressed stand growth rates indicate it is not a viable option for long-term forest management.
机译：美国东部的许多山地橡树林正接近经济和生物成熟度。 1981年至1984年，在康涅狄格州中部的三处森林中开展了一项研究，以研究六种不同的砍伐方法（阔叶木，直径限制，多龄农作物树，高等级，造林用材林，森林保护区）对锯木栎林林分生长和动态的影响。 。在初次收获之前，木板英尺的体积（国际1/4）平均为8.4 mbf / ac。百分之六十九的锯木树的对接原木等级为2或更高。在两个切割周期中，高品位地块（36 bf / ac /年）的体积增长显着低于森林保护区，直径限制，遮荫木和多龄作物树地（〜214 bf / ac /年）。营林截割地块的总板脚单产（最终体积加收成体积）（7.3 mbf / ac）显着低于未切割，遮盖木和直径极限切割的12.3、12.5和13.0 mbf / ac。这项研究表明，三种截然不同的采伐方法：遮荫木，多龄农作物树和森林保护区导致锯木栎林的林分体积增长率相似。希望产生收入以抵消支出的土地所有者可以使用前两种方法。选择将取决于地主的审美和再生目标。限切切割也具有相似的体积比率，但是有必要降低第二个切割循环的直径限制，以保持经济上可行的收成。因此，第二个切割循环后的剩余林分结构与高品位图相似。尽管高品位在第一个采伐周期中收获量最高，但残留树木的质量低下和林分增长率低下表明，这不是长期森林管理的可行选择。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号