Forest Inventory of a Northern Hardwood Forest: Watershed 6 1987, Hubbard Brook Experimental Forest

Forest inventory surveys were initiated in 1965,
repeated in 1977, and repeated at 5 year intervals after
that; this data set was collected in summer of 1987. The
inventory consists of a total inventory of all trees >=10
cm diameter-at-breast-height (dbh) on the whole of the
watershed (13.23 ha), as measured in each of the 208 25 m x
25 m plots. Trees >=2 to <=10 cm dbh were inventoried
on 35 of the 25 m x 25 m plot.
These data were gathered as part of the Hubbard Brook
Ecosystem Study (HBES). The HBES is a collaborative effort at
the Hubbard Brook Experimental Forest, which is operated and
maintained by the USDA Forest Service, Northern Research
Station.

森林清查调查始于1965年，1977年重复开展，此后每5年进行一次；本数据集于1987年夏季收集。该清查包含对整个流域（13.23公顷）内所有胸径（diameter-at-breast-height, dbh）≥10厘米的树木的全面清查，数据通过208个25米×25米样地的逐一测量获得。胸径在2厘米至10厘米之间（含两端）的树木则在35个25米×25米样地中进行清查。

这些数据是哈伯德布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的一部分。HBES是在哈伯德布鲁克实验林开展的合作项目，该实验林由美国农业部林务局北方研究站运营和维护。