Forest Inventory of a Northern Hardwood Forest: Watershed 6 1992, 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 1992. 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 subsampled
using a 3 meter wide strip along one edge of each 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.

本森林资源调查始于1965年，1977年开展重复调查，此后每5年进行一次复测；本次数据集采集于1992年夏季。本次调查对整个流域（13.23公顷）内所有胸径（diameter-at-breast-height, dbh）≥10厘米的林木开展全量清查，覆盖208个25米×25米的标准样地，每个样地均完成对应测量。对于胸径介于2厘米至10厘米之间的林木，则采用每个25米×25米样地一侧边缘的3米宽样带进行抽样调查。本数据集作为哈伯布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的一部分采集所得。哈伯布鲁克生态系统研究是依托哈伯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（USDA Forest Service）北部研究站运营维护。