Canadian Forest Service Publications

Accroissement en volume de l'épinette noire : précision de sa détermination. 1991. Zarnovican, R. Canadian Journal of Forest Research 21 : 1816-1822.

Year: 1991

Issued by: Laurentian Forestry Centre

Catalog ID: 14247

Language: French

Availability: PDF (request by e-mail)

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The relationship between volume growth rate and diameter growth rate (diameter at breast height) was studied from growth data established by stem analysis for dominant black spruce trees (Picea mariana (Mill.) B.S.P.) of a black spruce - feather moss stand. The results indicate a very close relationship between the two variables, and a linear model was chosen to predict volume growth rate. Independent model validation, based upon analysis of residual errors, indicates a small positive bias (0.006%) with a relatively good precision (±9.9%) and a x2 test anticipated accuracy of ±0.71% at the 0.05 probability level. The annual volume increment calculated with the prediction model and with the local volume equation for validation data was more precise (bias = -0.02 dm3/year, precision = ±11.8%) than the volume increment calculated with this model and the general volume equation (bias = -0.39 dm3/year, precision = ±26.4%). Finally, the x2 test showed that the anticipated accuracy of the annual volume increment was ±0.54 dm3/year at the 0.05 probability level for the prediction model and the local volume equation, and ±0.90 dm3/year for the prediction model and the general volume equation for validation data.