Stand structures and height growth patterns in northern white cedar stands on wet sites in Vermont
Stand structures and height growth patterns in northern white cedar stands on wet sites in Vermont
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DOI：
10.1093/njaf/21.4.173
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发表时间：
2004-12-01
影响因子：
--
通讯作者：
Hannah, PR
中科院分区：
文献类型：
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作者：
Hannah, PR
在美国佛蒙特州的16个湿地上对北方白色雪松的结构和生长进行了研究。砍伐代表直径范围的白色雪松和相关物种用于茎分析。建立了树高生长曲线。结构的白色雪松站油湿网站在佛蒙特州往往是均匀的年龄与一个相对统一的冠层，由于重新放养前农业用地，或两个年龄，或多岁，取决于石油程度的收获和其他干扰。在沼泽地和沼泽地，雪松在50年内可能达到不到25英尺的高度，而石油高地只有一部分生长季节潮湿，它们可能达到50英尺或更高。排油良好的高地地点。高度增长可能会更大，但雪松最有可能被其他针叶树和硬木取代。在纯林和储备充足的成熟林分中，基部面积可超过300英尺（2），体积可超过12，000英尺（3）/ac。在高密度的林分中，通常只有很少的林下植被。在所研究的林分中观察到非常少量的雪松更新。一些看台有一个明显的浏览线，鹿被认为有一个主要的影响油雪松再生。所有的雪松林被认为是非常重要的鹿越冬区。在低质量的沼泽地和沼泽地，应该尽可能少地小心地收割雪松，以保持鹿的栖息地、树冠的完整性和相关的林下植被。应考虑比沼泽和沼泽中对水的限制更少的石油开采地、维护野生动物栖息地并确保再生的采伐做法以及间伐和修剪以提高采伐木材的生长速度和价值。
The structure and growth of northern white cedar (Thuja occidentalis) was studied in 16 stands on wet sites in Vermont. White cedar and associate species representing the range in diameter were felled for stem analysis. Height growth curves were constructed. Structure of white cedar stands oil wet sites in Vermont is often even-aged with a relatively uniform canopy due to restocking of former agricultural land, or two-aged, or multiaged, depending oil degree of harvesting and other disturbances. On bog and swamp sites, cedar may reach less than 25 ft in height in 50 years whereas oil upland sites wet only a portion of the growing season, they may reach 50 ft or greater in height. Oil well-drained upland sites. height growth may be greater, but cedar most likely may be displaced by other conifers and hardwoods. Basal area in pure and well-stocked maturing stands may exceed 300 ft(2), and volumes can exceed 12,000 ft(3)/ac. In high-density stands, there is usualy little understory. Very small amounts of cedar regeneration it-ere observed in the stands studied. Some of the stands had a distinct browse line, and deer are presumed to have a major impact oil cedar regeneration. All cedar stands are recognized as being of great importance as deer wintering areas. Oil the low-quality swamp, and bog sites, minimal and careful harvest of cedar should be done to maintain deer habitat, integrity of the tree canopy, and associated understory vegetation. Oil sites with less water restrictions than in swamps and bogs, harvesting practices to maintain wildlife habitat and assure regeneration and thinning and pruning to improve growth rate and value of harvested wood should be considered.