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首页> 外文期刊>Northern Journal of Applied Forestry >Stand structures and height growth patterns in northern white cedar stands on wet sites in Vermont
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Stand structures and height growth patterns in northern white cedar stands on wet sites in Vermont

机译：北部白雪松在佛蒙特州湿地上的林分结构和高度生长模式

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摘要

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 ft2, and volumes can exceed 12,000 ft3/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.
机译：在佛蒙特州湿地的16个林分中研究了北部白柏（Thuja occidentalis）的结构和生长。砍伐代表直径范围的白柏和相关物种进行茎分析。绘制了高度增长曲线。佛蒙特州的白雪松林油浸场所的结构通常是均匀的，而且冠层相对均匀，这是由于以前的农业用地或两岁或多岁的补给所致，具体取决于收获的油度和其他干扰因素。在沼泽和沼泽地区，雪松的高度可能会在50年内达到25英尺以下，而油旱地仅在整个生长季节的一部分时间内潮湿，它们的高度可能会达到50英尺或更高。石油排水良好的高地。身高增长可能更大，但雪松很可能会被其他针叶树和硬木所取代。纯净和储备充足的成熟林分的基础面积可能会超过300平方英尺，且体积可能会超过每英亩12,000平方英尺。在高密度看台上，通常很少有林木。在所研究的林分中观察到非常少量的雪松再生。一些看台具有独特的浏览线，并且推测鹿对雪松的再生具有重大影响。所有的雪松林都被认为是鹿越冬的重要场所。在低质量的沼泽和沼泽地上加油，应尽量少而细心地采伐雪松，以保持鹿的栖息地，树冠的完整性以及相关的林下植被。应考虑与沼泽和沼泽相比水限制少的油厂，应采取采伐措施来维持野生动植物的栖息地，并确保其再生，间伐和修剪以提高木材的生长速度和价值。

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