Keyword: modelling
- A growth intercept model for coastal Douglas-fir.
http://www.for.gov.bc.ca/hre/pubs/pubs/0038.htm
This research develops a growth intercept model for coastal Douglas-fir. Forty-eight stem analysis plots were located in the Coastal Western Hemlock and Coastal Douglas-Fir biogeoclimatic zones of British Columbia. Three Douglas-fir trees in each plot were selected for intensive sampling. These trees were cut down and the height at the end of each growing season was identified from the annual branch whorls. The top height growth of the plots was reconstructed and the site index and growth intercept for breast height ages one to 50 were calculated from the height-breast height age data. A model was then fitted to the site index and growth intercept data, resulting in a growth intercept model which consisted of 50 functions. Four refinements to the growth intercept modelling technique are introduced in this report. These eliminate deficiencies noted in other growth intercept modelling endeavours. ...
- SYLVER: modelling the impact of Silviculture on Yield, Lumber Value and Economic Return.
http://www.for.gov.bc.ca/hre/pubs/pubs/0044.htm
SYLVER: modelling the impact of Silviculture on Yield, Lumber Value and Economic Return. ...
- Expanding concepts of growth and yield modelling to disease impacts and forest products.
http://www.for.gov.bc.ca/hre/pubs/pubs/0047.htm
Expanding concepts of growth and yield modelling to disease impacts and forest products. ...
- Modelling the growth of Douglas-fir in France.
http://www.for.gov.bc.ca/hre/pubs/pubs/0051.htm
Proceedings of the meeting on "Forest Growth Modelling and Simulation", Mensuration, Growth and Yield Section of IUFRO, Vienna, Austria. pp. 25-39. ...
- Management and research insights acquired via modelling route.
http://www.for.gov.bc.ca/hre/pubs/pubs/0057.htm
Management and research insights acquired via modelling route. ...
- Interior Douglas-fir growth intercept models.
http://www.for.gov.bc.ca/hre/pubs/pubs/0085.htm
The objective of this study was to develop growth intercept models for interior Douglas-fir (pseudotsuga menziesii var. glauca). These models relate site index to the early height growth of trees. They were developed using a well-established modelling technique and 72 sample plots established throughout the interior of British Columbia, and were tested with an independent data set. The test showed that the models were statistically biased below breast height age nine, but the practical significance of the bias may be such that the models can be used in young stands. The results of the model testing should be interpreted with caution. ...
- Identifying and modelling the spatial distribution dynamics of regenerating lodgepole pine.
http://www.for.gov.bc.ca/hre/pubs/pubs/0086.htm
Identifying and modelling the spatial distribution dynamics of regenerating lodgepole pine. ...
- A variable growth intercept model for spruce in the Sub-Boreal Spruce and Engelmann Spruce - Subalpine Fir biogeoclimatic zones of British Columbia.
http://www.for.gov.bc.ca/hre/pubs/pubs/0095.htm
The variable growth intercept modelling technique is applied to three species of interior spruce in the Sub-Boreal Spruce and Engelmann Spruce-Subalpine Fir biogeoclimatic zones -- Engelmann (Picea engelmannii Parry), white (P. 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. Good results were obtained from the analysis of the model development data. However, testing indicated that the model may be biased (it underestimates site index). Nevertheless, interior spruce site index can be estimated with the model, but the model should be evaluated more thoroughly. ...
- Site index conversion equations for mixed species stands.
http://www.for.gov.bc.ca/hre/pubs/pubs/0101.htm
Models are developed to predict the site index of one species in a mixed stand from the site index of a cohort. These models are applicable to site quality evaluation, growth and yield modelling, and timber management planning. A single-equation compatible site index conversion system is developed using the geometric mean regression (GMR) line for the following species mixes: coastal Douglas-fir/western hemlock; interior Douglas-fir/lodgepole pine, Douglas-fir/white spruce, Douglas-fir/western hemlock, Douglas-fir/western larch, white spruce/lodgepole pine, white spruce/subalpine fir, lodgepole pine/subalpine fir, and lodgepole pine/western larch. ...
- A process-oriented approach to modelling forest tree mortality.
http://www.for.gov.bc.ca/hre/pubs/pubs/0102.htm
A process-oriented approach to modelling forest tree mortality. ...
- Growth Intercept, Years-to-Breast-Height, and Juvenile Height Growth Models for Ponderosa Pine.
http://www.for.gov.bc.ca/hre/pubs/pubs/0170.htm
A suite of models consisting of height-age (site index), growth intercept, years-to-breast-height, juvenile height, and Site Index - Biogeoclimatic Ecosystem Classification (SIBEC) models are commonly used in British Columbia to estimate the height and site index of forest stands. Eighty plots of ponderosa pine stem analysis data were collected across the range of ponderosa pine in British Columbia. The years-to-breast-height, growth intercept, and juvenile height models were developed with these data. Height-age models were also developed, but are described elsewhere. The data were also used to further populate the SIBEC database. The growth intercept models were developed using standard techniques. The years-to-breast-height models used a slightly different functional form for the model. The juvenile height modelling technique was modified to more seamlessly splice the height curves into the height-age models. ...
- Measuring and modelling spruce leader temperatures.
http://www.for.gov.bc.ca/hre/pubs/pubs/0200.htm
Measuring and modelling spruce leader temperatures. ...
- Examining bias in estimating the response variable and assessing the effect of using alternative plot designs to measure predictor variables in diameter growth modelling.
http://www.for.gov.bc.ca/hre/pubs/pubs/1001.htm
Examining bias in estimating the response variable and assessing the effect of using alternative plot designs to measure predictor variables in diameter growth modelling. ...
- Modelling the relationship between crown morphology and wood characteristics of coastal western hemlock in British Columbia.
http://www.for.gov.bc.ca/hre/pubs/pubs/1300.htm
In Fourth Workshop on the connection between silviculture and wood quality through modelling approaches and simulation software, Harrison Hot Springs, British Columbia, Canada, Edited by Gerard Nepveu. Equipe de Recherches sur la Qualite' des Bois, INRA, Nancy, France, pp: 308-319. ...
- Coarse woody debris: inventory, decay modelling, and management implications in three biogeoclimatic zones.
http://www.for.gov.bc.ca/hre/pubs/pubs/1342.htm
Coarse woody debris: inventory, decay modelling, and management implications in three biogeoclimatic zones. ...
- Snowmelt in a forest and clearcut.
http://www.for.gov.bc.ca/hre/pubs/pubs/1398.htm
Methods for obtaining daily snowmelt rates in forest and clearcut environments were evaluated at high elevation sites in the southern interior of British Columbia, Canada (Upper Penticton Creek Watershed Experiment). Snowmelt was measured during spring 1998 to 2002 in a clearcut with snowmelt lysimeters and calculated for the clearcut and a forest from the daily snow pack depth and snow density. Daily melt rate was calculated in the forest and clearcut from weather station data using an air temperature index method and with the energy balance. Measurements were used to calibrate clearcut and forest snow albedo models, to determine solar radiation transmission through the forest canopy and to calculate the canopy view factor for longwave radiation in the forest. Snow temperature measurements were used to define the beginning and end of the melt season when modelling snowmelt. Lysimeter and snow depth and density based measurements of snowmelt agreed quite well. The air temperature index method gave acceptab ...
- Seed source selection and deployment to address adaptation to future climates for interior spruce in western Canada.
http://www.for.gov.bc.ca/hre/pubs/pubs/1403.htm
n advances in climate modelling, geographic information systems and ecological modelling to provide tools that will help maintain the health and productivity of Canada’s forests in a changing climate. ...
- Modelling Boreal Mixedwoods with the Tree and Stand Simulator (TASS).
http://www.for.gov.bc.ca/hre/pubs/pubs/1420.htm
This Extension Note provides an overview of the TASS modelling project for boreal mixedwoods. A general discussion of the present needs of boreal forest managers is provided with an introduction to our mixedwood and complex stand modelling approach using the TASS v.III multicanopy, growth and yield model. An overview of the available tree and stand level information is provided as well as a large body of references for further reader interest. ...
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