This document describes the procedures to sample Bl-IU stands in the Prince George Forest District. The intent is to quantify the old-growth characteristics of these stands and compare them with old stands of similar type in other areas of the District. These Bl-IU stand types were created under the era of intermediate utilization (IU) where spruce was selectively logged from mature stands. Many of these stands are now dominated by a balsam (Bl) over-story and thus are called Bl-IU (or residual-Bl) stands. The proposed sample design is based on measuring tree and stand attributes from randomly located points in the Bl-IU stand population. These Bl-IU stands cannot be identified with certainty in the inventory data, thus we used a GIS-based net-down process that considered species composition, age of harvesting, and proximity to rivers or railways. This plan is based on using the provincial Vegetation Resources Inventory (VRI) standards where each sample is a cluster of five prism plots and other fixed-area plots. Measurements include large and small trees, live and dead trees, regeneration, coarse woody debris, stand structure, and ecological attributes. This design includes an initial batch of 25 sample points with an additional 10 in case they are needed. This is a point-based sample thus analysis should focus on attributes for the entire sample population (not polygons). These attributes can be compared with those in other old stands in the District measured as part of a VRI project planned for the 2006 field season.
J.S. Thrower & Associates Ltd.
J.S. Thrower and Associates Ltd.. 2006. A sample plan to quantify old-growth characteristics of balsam-IU stands in the Prince George Forest District. Forest Investment Account (FIA) - Land Base Investment Program - Innovative. Forest Investment Account Report