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Silviculture Treatments for Ecosystem Management in the Sayward (STEMS)
Silviculture Treatments for Ecosystem Management in the Sayward (STEMS) is a large-scale, multi-disciplinary experiment that compares forest productivity, economics, and public perception of seven silvicultural regimes replicated at three sites in the Sayward Forest. The STEMS experiment uses silvicultural systems and treatments to create diversity in forest structure that results in a variety of canopy layers (vertical structure) and spatial patchiness (horizontal structure) to enhance biodiversity and wildlife. This Technical Report describes the establishment of the second replication of STEMS starting in 2003 near Elk Bay in the Sayward Forest. Treatment units were harvested in 2005. STEMS 2 stand conditions differ from STEMS 1 with higher densities and proportions of western hemlock (Tsuga heterophylla) and moister biogeoclimatic site series.--Document.
Growth Intercept, Years-to-breast-height, and Juvenile Height Growth Models for Ponderosa Pine
This report describes features of three models developed for estimating site index & height growth of ponderosa pine. The models are based on data from 80 ponderosa pine stem analysis plots established throughout the range of this species in British Columbia. The first model is used to calculate the number of years that a tree takes to reach breast height. The second model calculates the average annual height growth, adjusted for age. The final model is for calculating juvenile height.
Juvenile Height Models for Lodgepole Pine and Interior Spruce
Juvenile height models have been developed with data collected from a small area of British Columbia for lodgepole pine and interior spruce. The purpose of the project described in this report is to validate these models with data from six biogeoclimatic zones where lodgepole pine & interior spruce commonly occur. Trees were sampled from plots in each zone and annual height was measured directly from pith nodes. A rigorous validation procedure was applied to validate the models for the province as a whole and on a zonal basis. A slight bias revealed in the models led to refitting of new models to the new data. A small validation of the new model for lodgepole pine demonstrates whether it is adequate for use in the interior Douglas fir zone.
A Biophysical Model for Estimating Site Index for the Major Commercial Tree Species in British Columbia
A site index geographic information system (GIS) layer is being developed for British Columbia so that estimated site indices are available for the major commercial tree species across their ranges. The Site Index - Biogeoclimatic Ecosystem Classification (SIBEC)/predictive ecosystem map (PEM)/terrestrial ecosystem map (TEM) method will be used to populate the layer with site index by species. However, there will be gaps in the layer where there are no PEM/TEM or SIBEC data. The biophysical models resulting from this project will be used to fill these gaps. They predict, by species, site index from biogeoclimatic zone, slope, aspect, elevation, and climate variables. Data for these models co...
Identifying and Modelling the Spatial Distribution Dynamics of Regenerating Lodgepole Pine
This study investigated the changes in the spatial distribution of lodgepole pine stands as regeneration proceeds. Data were collected from 29 plots established in regenerating lodgepole pine stands and remeasured two years later. Nine of these plots had sufficient ingrowth to warrant an analysis of their spatial distribution dynamics. Ripley's K(t) statistic was used to identify the spatial pattern of the trees at the initial measurement, the ingrowth trees, and the combined initial and ingrowth trees. The K(t) statistic was also employed to detect correlation between the locations of the initial and the ingrowth trees. The spatial patterns were modelled by a Poisson cluster process, a Poisson process, or a Markov point process when the trees were aggregated, random, or regularly distributed, respectively.
A Variable Growth Intercept Model for Spruce in the Sub-boreal Spruce and Engelmann Spruce-subalpine Fir Biogeoclimatic Zones of British Columbia
This paper applies the variable growth intercept modelling technique to three species of interior spruce in the sub-boreal spruce and Engelmann spruce-subalpine fir biogeoclimatic zones in British Columbia: Picea engelmannii Parry, Picea glauca (Moench) Voss, and their cross. The variable growth intercept model allows foresters to estimate spruce site index from the first 1-30 years of height growth above breast height of a stand. Results presented from the analysis of the models includes parameter estimates, their standard error, the root mean square error, the W statistic for normality, the Fk statistic for homoscedasticity, and the degree of apparent bias in the model.
