Forest Inventory of a Calcium Amended Northern Hardwood Forest: Watershed 1, 2011, Hubbard Brook Experimental Forest

In order to evaluate the role of Ca supply in
regulating the structure and function of base-poor forest and
aquatic ecosystems, the Ca content of soil was increased
through the application of wollastonite (CaSiO3) in October
1999. Forest inventory surveys were initiated in 1996 and
repeated at 5 year intervals. This data set includes 2011
inventory measurements. The data consists of a total
inventory of all trees >=10 cm diameter-at-breast-height
(dbh) on the whole of the watershed (11.8 ha), as measured in
each of the 200 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. With the addition of tree tags in
2006 on all trees >=10 cm dbh, tracking of individual
trees is now possible. 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.

为评估钙（Ca）供应对低基性森林与水生生态系统结构及功能的调控作用，研究团队于1999年10月通过施加硅灰石（wollastonite，CaSiO₃）提升了土壤钙含量。森林清查工作始于1996年，每5年重复开展一次。本数据集包含2011年的清查测量结果。该数据集涵盖整个集水区（面积11.8 ha）内所有胸径（diameter-at-breast-height, dbh）≥10 cm的林木全量清查数据，清查在200个25 m × 25 m样地中逐一开展。对于胸径介于2 cm至10 cm之间的林木，则在每个25 m × 25 m样地的一侧设置3 m宽的样条带进行抽样调查。2006年起，研究人员为所有胸径≥10 cm的林木加装了专属树牌，自此可实现单株林木的追踪监测。本数据集作为哈伯德布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的一部分收集完成。HBES是哈伯德布鲁克实验林的协同研究项目，该实验林由美国农业部林务局北部研究站（USDA Forest Service, Northern Research Station）运营维护。