Canadian Forest Service Publications
Influence of herbaceous and wood competition on white pine regeneration in a uniform shelterwood. 2011. Pitt, D.G.; Morneault, A.; Parker,W.C.; Lanteigne, L.; Hoepting, M.K.; Stinson, A. The Forestry Chronicle 87:653-668.
Issued by: Great Lakes Forestry Centre
Catalog ID: 33070
Availability: PDF (request by e-mail)
We investigated the effects ofherbaceous and woody vegetation control onthesurvival and growth ofplanted and natural eastern white pine (Pinus strobus L.) seedlings through six growing seasons following auniform shelterwood regeneration harvest on two independent sites. Subsequent tochain scarification, white pine seedlings were planted at 2-m spacing, augmenting natural regeneration (full stocking and >3000 seedlings perha). Herbaceous vegetation control involved the suppression ofgrasses, forbs, ferns, and low shrubs, and was maintained for zero, two, orfour growing seasons after planting. Woodycontrol involved the removal of all tall shrubs and deciduous trees, and was conducted at the time of planting, atthe end ofthe second orfifth growing seasons, ornot at all. White pine seedling growth responded positively toincreased duration ofherbaceous vegetation control and negatively to delayed woody control. Maximum growth was not realized unless both types ofvegetation were suppressed. During the first six growing seasons, the height growth of planted pine was more than twice that ofnaturally regenerating pine, regardless oftending regime. The study suggests that successful white pine regeneration may be achieved by thinning from below to allow 50% to60% offull sunlight in the understory, followed by the proactive, early suppression ofwoody and herbaceous vegetation to maintain optimum light levels and reduce competitionfor soil moistureand nutrients.