Forest Inventory of a Calcium Amended Northern Hardwood Forest: Watershed 1, 1996, 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
pre-treatment inventory measurements collected in 1996. 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.
Tree tags were added in 2006 on all trees >=10 cm dbh;
tracking of individual trees is not possible prior to that
collection year. 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.