TREE SWAY PERIOD—A POSSIBLE NEW PARAMETER FOR CROWN CLASSIFICATION AND STAND COMPETITION
TREE SWAY PERIOD—A POSSIBLE NEW PARAMETER FOR CROWN CLASSIFICATION AND STAND COMPETITION
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树木摇摆周期——树冠分类和林分竞争的一个可能的新参数
DOI：
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发表时间：
1962
期刊：
影响因子：
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通讯作者：
M. Sugden
中科院分区：
文献类型：
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作者：
M. Sugden
红松(Pinus resinosa Ait.)和一些白松(Pinus strobus L.)用秒表测量了四个种植园和一个本地林分的树木。这一新参数与直径/高度的比值表现出良好的相关性；偏离这一比值的主要原因是树冠的质量和高度不同。从6个大的红松上修剪树冠，并观察它们修剪后的树干的摇摆周期。“树冠时刻”被认为是一个比树冠密度或树冠等级更全面的指标。还讨论了影响树木摇摆期的其他可能因素，但每个因素的相对重要性仍有待调查。各林分的摆动周期频率曲线表明，林分的平均摆动周期随着年龄和竞争的增加而增加。
The natural sway periods of red pine (Pinus resinosa Ait.) and some white pine (Pinus strobus L.) trees were measured with a stop watch in four plantations and one native stand. This new parameter showed fair correlation with the ratio diameter/height; deviations therefrom were thought to be due largely to the variable mass and height of the crown. The crowns were pruned from six large red pines and the sway periods of their pruned boles were observed. "Crown moment" was postulated as a more all-inclusive index than either crown density or crown class alone. Other possible factors affecting tree sway period were discussed, although the relative importance of each remains to be investigated. Sway period frequency curves for each stand suggested that the mean sway period of a stand increases with age and with increasing competition.