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Providing evidence to improve practice

Individual study: Ten-year regeneration responses to varying levels of overstory retention in two productive southern British Columbia ecosystems

Published source details

Newsome T.A., Heineman J.L., Nemec A.F.L., Comeau P.G., Arsenault A. & Waterhouse M. (2010) Ten-year regeneration responses to varying levels of overstory retention in two productive southern British Columbia ecosystems. Forest ecology and management, 260, 132-145


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Use partial retention harvesting instead of clearcutting Forest Conservation

A replicated, randomized, controlled study in 1994-2005 in temperate coniferous woodland in British Columbia, Canada (Newsome et al. 2010) found that partial-cutting decreased the cover of understory conifers compared with clearcutting at one of two sites. At one site cover of tall (2-10 m) understory conifers was higher in clearcut (12%) than partial-cut plots (3-6%). Cover of other plants was similar between treatments: tall shrubs (clearcut: 19%; partial-cut: 13-15%), short (<2 m) shrubs (clearcut: 39%; partial-cut: 24-28%), short conifers (clearcut: 2%; partial-cut: 4-5%), herbs (clearcut: 37%; partial-cut: 36-41%) and mosses and lichens (clearcut: 6%; partial-cut: 12-22%). At a second site, cover of plant groups was similar between treatments: tall conifers (clearcut: 8%; partial-cut: 6-8%), short conifers (clearcut: 10%; partial-cutt: 10-14%), tall shrubs (clearcut: 12%; partial-cut: 3-4%), short shrubs (clearcut: 41%; partial-cut: 19-28%), herbs (clearcut: 23%; partial-cut: 21-22%) and mosses and lichens (clearcut: 6%; partial-cut: 13-19%). Data were collected in 2004-2005 in 16 subplots (200 m2) within each of four clearcut and eight partial cut (25-50% of basal area retained) treatment plots (1 ha) in each of two sites. Treatments were applied in 1994-1996.