Canadian Forest Service Publications
Root form and stability of outplanted trees: results of a 1989 survey. 1995. Girouard, R.M. Arboricultural Journal 19: 121-146.
Issued by: Laurentian Forestry Centre
Catalog ID: 16660
During 1989, an investigation into the growth and stability of black spruce (Picea mariana [Mill.] B.S.P.) and jack pine (Pinus banksiana Lamb.) was performed in eight plantations aged three to nine years in the Lower St. Lawrence-Gaspé region. The highlights of the field work showed that air pruning of taproots and primary lateral roots of containerized black spruce seedlings resulted in the formation of replacement roots. Superficial root systems were more abundant in black spruce than in jack pine saplings, while the normal type of root system, with roots developing from the top, middle and lower portions of the plug roots, was dominant in jack pine saplings. Slight differences were found in the number of L-shaped, spiralled and grafted roots due to differences in species. In outplanted bareroot seedlings, the plunging or vertical root component was important only in jack pine.