The H for DBH
The H for DBH
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DOI：
10.1016/s0378-1127(99)00141-3
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发表时间：
2000-04-17
影响因子：
3.7
通讯作者：
Thompson, J
中科院分区：
文献类型：
--
作者：
Brokaw, N;Thompson, J
测量树木的常用方法是记录胸径（DBH）。然后使用胸径来计算树木生长、断面积和生物量。因此，森林生态学中使用的各种量的准确性取决于胸径的准确和一致的测量。由于树干逐渐变细，胸高（BH）（测量直径的地面高度）应影响胸径的记录。因此，如果研究人员希望比较研究地点之间以及一个地点的研究期间之间的数据，那么显然 BH 必须指定且一致。我们调查了文献以确定给出 BH 值的频率以及 BH 是否是标准的。我们还测量了两个 BH 的树木，以了解 BH 的差异对胸径以及断面积和树木生物量的导出值有多大影响。在我们的文献调查中，我们记录了过去 10 年（1988±1997）在五种期刊上发表的所有使用 DBH 的研究中是否规定了 BH 值，如果是的话，给出了什么值。其中包括三个致力于普通生态学的期刊：Biotropica、Ecology 和 Journal of Tropical Ecology；和两个致力于森林
A common way to measure trees is to recorddiameter at breast height', or DBH. DBH is then used to calculate tree growth, basal area, and biomass. Thus, the accuracy of various quantities used in forest ecology depends on accurate and consistent measurement of DBH. Because tree stems taper,breast height'(BH), the height above ground where diameter is measured, should influence DBH recorded. It thus seems clear that BH must be specified and consistent if researchers wish to compare data between study sites and between study periods at one site. We surveyed the literature to determine how frequently the value of BH is given and if BH is standard. We also measured trees at two BHs to see how much effect a difference in BH has on DBH and on the derived values of basal area and tree biomass.In our literature survey we recorded if a value for BH was stated and, if so, what value was given, in all studies using DBH and published over the last 10 years (1988±1997) in five journals. These included three devoted to general ecology: Biotropica, Ecology, and Journal of Tropical Ecology; and two devoted to forest