Forest Investment Account

Abstract of FII Project R2003-115

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Fertilizer and thinning effects on a Douglas-fir ecosystem at Shawnigan Lake: 30 year response

Author(s): Macey, Donna E.; Natural Resources Canada - Canadian Forest Service
Imprint: [Victoria}, B.C. : Natural Resources Canada, Canadian Forest Service, 2003
Subject: Forest Investment Account (FIA), Pseudotsuga Menziesii, Fertilization (Biology), Urea, Ammonium Nitrate
Series: Forest Investment Account (FIA) - Forest Science Program


The Shawnigan Lake project was established in 1970 to study the short- and long-term effects of thinning and fertilization in second growth Douglas-fir. The installation includes main and subsidiary experiments. Growth and yield are measured periodically, and the results summarized in various reports. These data are used to analyze treatment responses and to expand growth and yield models. The measurement cycle was every 3 years to year 18 following treatment. The installation was re-measured in 1994,1995 under Forest Resource Development Agreement and results of the main experiment, covering the 24-year response, were reported. In 2002, the installation was re-measured with funding from Forest Innovation Investment. Forestry Research Program. These data are summarized in a preliminary report that documents the 31-year (1972 plots) and 32-year (1971 plots) growth response to thinning and fertilization of the main experiment. The report includes interim analysis of diameter, height and volume growth on an individual tree and land area basis. Following remeasurement of the 1972 replicate plots, a comprehensive evaluation of the 32-year growth response, drawing on previous studies to provide explanations for the observed treatment effects, is proposed.
Donna Macey.

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Updated August 02, 2006 

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