Canadian Forest Service Publications
The effect of decay on growth rate in a white spruce plantation. 1978. Lachance, D. Forestry Chronicle 54(1): 20-23.
Issued by: Laurentian Forestry Centre
Catalog ID: 16354
Availability: PDF (request by e-mail)
In a white spruce plantation, sound dominant and co-dominant trees increased their total volume by 55.3% between ages 36 and 46 years, while trees with butt decay grew only 44.0%. In net terms, during that 10-year period, sound trees produced 27% more wood in volume than trees with butt decay. Growth reduction increased with increasing amount of decay present, but not in comparable proportions. This is explained by the presence mainly of root and butt rot fungi which severely affect the root system before causing much decay. Growth losses were evaluated from observations on trees still living at the end of the 10-year period; losses from trees which died during this time were not included. Polyporus tomentosus, a root and butt rot fungus which is relatively important in coniferous plantations, caused 66% (in volume and frequency) of the decay.