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Forestry Advance Access first published online on April 28, 2008
This version published online on April 30, 2008
Forestry, doi:10.1093/forestry/cpn019
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© Institute of Chartered Foresters, 2008. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Complex Stand Structures SI

Percent stocking models for four major Alberta tree species

Yuqing Yang1,*, Shongming Huang1 and W.R. Dick Dempster2

1 Forest Management Branch, Alberta Ministry of Sustainable Resource Development, 8th Floor, 9920-108 Street, Edmonton, Alberta, Canada T5K 2M4
2 Dick Dempster Consulting Ltd, 206, 10009-102 Avenue, Edmonton, Alberta, Canada T5J 5B6

* Corresponding author. E-mail: yuqing.yang{at}gov.ab.ca


  Abstract

Based on stem-mapped permanent sample plot data, percent stocking dynamics were modelled for four major tree species in the province of Alberta, Canada: trembling aspen (Populus tremuloides Michx.), white spruce (Picea glauca (Moench) Voss), lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) and black spruce (Picea mariana (Mill.) B.S.P.). Percent stocking was defined as the percentage of 10-m2 plots occupied by at least one tree with a minimum height of 1.3 m. The difference equation technique was applied for model fitting. Site index was a significant predictor in all models. Heterogeneous residual variances present in the aspen, white spruce and lodgepole pine models were corrected by applying a power-of-the-mean variance function. Serial correlation due to repeated measurements was considered through a linear log covariance structure. A percent stocking index, defined as the percent stocking at 50 years total age, was derived from the fitted percent stocking models and used for assessing species interactions in mixed-species stands. The presence of other species did not appear to affect percent stocking changes over time for aspen and black spruce. However, white spruce percent stocking was reduced when growing together with aspen, and lodgepole pine percent stocking was negatively affected by the presence of aspen, white spruce and black spruce.

Received 28 September 2007.
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