Canadian Forest Service Publications

Fertilization and thinning effects on a Douglas-fir ecosystem at Shawnigan Lake. 2. 3-year growth response. 1977. Crown, M.; Quenet, R.V.; Layton, C. Government of Canada. Department of the Environment. Canadian Forest Service, Pacific Forest Research Centre, Victoria, BC. Information Report BC-X-152. 36 p.

Year: 1977

Issued by: Pacific Forestry Centre

Catalog ID: 1765

Language: English

Series: Information Report (PFC - Victoria)

Availability: PDF (download)

Mark record


Site specific growth data for the 3 years following fertilization and thinning are given for the Shawnigan research plots. The data base is documented and gross and merchantable volume, and cumulative dbh and height increments are given. Evaluation of treatment response is investigated using individual tree increments (dbh, ba, height and gross volume), stand structure analysis and crop tree analysis.

Significant early treatment responses are shown. By using covariance analysis with the 618 largest trees/ha as the crop trees, the percent gain in gross volume increment over the adjusted control treatment was 54, 110 and 188, respectively, for heavy thinning without fertilization, heavy fertilization with no thinning, and heavy thinning and heavy fertilization combined.

The analytical approaches used are compared and reader feed-back is solicited.