The Coastal Stand Management Growth and Yield Field Experiments Program encompasses 23 active Experimental Projects (1854 plots). Treatments include espacement, spacing, thinning, fertilizing and pruning. Installation have been regularly established, measured and maintained since as long ago as 1928. The installations are regularly measured based on their periodic growth. The experimental design and statistical approach of each experiment ensures that data collected from experimental plots can provide objective and meaningful conclusions about the effects of stand management treatments on tree and stand growth and yield. Funding sources to establish, maintain and measure the Coastal GY installations have ranged over the years from Base funding to FRPA to FRBC and more recently, FIA-FSP.
The following experiments were measured and maintained according to Ministry standards:
? EP 703.4 (18 plots) Extensive Studies of Fertilizing and Thinning. An additional 30 plots will be measured from outside funding sources.
? EP 1065.2 (42 plots) Effects of Pruning Severity on Western Hemlock
? EP 1065.3 (12 plots) Effects of Pruning Severity on Western Redcedar
? EP 1097 (36 plots) Effects of Thinning and Fertilization on Growth and Yield of Coastal Sitka Spruce - Western Hemlock stands on the Queen Charlotte Islands. This may be funded through SMRFA.
? EP 1121 (23 plots) Mixedwood Management
? EP 534 (46 plots) Spacing Trials of Douglas-fir
? EP 571 (72 plots) Tree Species and Initial Spacing on West Coast Vancouver Island.
The data from these and other long-term Coastal Stand Management Growth and Yield Field Experiments are used to build models and decision-making tools needed for essential tasks such as determining the effects of management practices on forest dynamics, growth and timber yields, continued development of SIBEC and other tools including GY modeling, and ultimately for the AAC determination processes. The data is also important in assessing new and emerging forest practices questions. The information generated is applicable throughout the Coast Forest Region. In addition to data collection, we conducted an analysis for determining the maximum density as a function of top height for pure stands of Douglas-fir and western hemlock. These relationships are needed to provide a constraint on the existing mortality module currently used in the Tree And Stand Simulator (TASS) individual tree growth and yield model. We fit an exponential stochastic frontier function to the density/top height data using 2940 observations from 628 plots experimental plots established along the coast of British Columbia, Washington, and Oregon. The fitting of the frontier functions using maximum likelihood estimation was successful and resulted in maximum density lines as a function of top height for both species. A paper was produced entitled 'Density Frontiers for Coastal British Columbia Douglas-fir and Western Hemlock Stands' and will be sent to WJAF for publication following a peer review in the 2006/07 fiscal year. For additional information about the Coastal Stand Management Growth and Yield Field Experiments program, please see the Stand Management page of the Research Branch website: https://www.for.gov.bc.ca/hre/standman/
Louise de Montigny.
Forest Investment Account (FIA). 2006. Coastal Stand Management Growth and Yield Field Experiments. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2006MR167