Long-term response of planted conifers, natural regeneration, and vegetation to harvesting, scalping, and weeding on a boreal mixedwood site
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Published source details
Man R., Rice J.A. & MacDonald G.B. (2009) Long-term response of planted conifers, natural regeneration, and vegetation to harvesting, scalping, and weeding on a boreal mixedwood site. Forest Ecology and Management, 258, 1225-1234.
Published source details Man R., Rice J.A. & MacDonald G.B. (2009) Long-term response of planted conifers, natural regeneration, and vegetation to harvesting, scalping, and weeding on a boreal mixedwood site. Forest Ecology and Management, 258, 1225-1234.
Actions
This study is summarised as evidence for the following.
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Use mechanical thinning before or after planting Action Link |
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Use clearcutting to increase understory diversity Action Link |
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Use mechanical thinning before or after planting
A replicated, randomized controlled study in 1993-2007 in boreal forest in Ontario, Canada (Man, Rice & MacDonald 2009) found that cutting increased the survival rate and size of planted trees. Survival rate (5-14 years after planting) of white spruce Picea glauca (uncut: 36%; cut: 69-74%) and jack pine Pinus banksiana (uncut: 6%; cut: 39-52%) was lower in uncut than in the three cut treatments. Height (cm) of white spruce (uncut: 60; partial cut : 180; partial cut and removal: 230; clearcut: 250) and jack pine (uncut: 70; partial cut: 300; partial cut and removal: 400; clearcut: 450) as well as root-collar diameter (cm) of white spruce (uncut: 1; partial cut: 3; partial cut and removal: 5; clearcut: 6) and jack pine (uncut: 1; partial cut: 4; partial cut and removal: 7; clearcut: 9) increased with increasing cutting intensity. In 1993-1994 four treatments: uncut, 50% partial cut, 50% partial cut with removal of residuals after three years, and clearcut were replicated in six blocks (112 × 56 m). Blocks were planted with white spruce and jack pine in 1994. Data were collected in 1998-2007.
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Use clearcutting to increase understory diversity
A replicated, randomized, controlled study in 1993-2007 in boreal forest in Ontario, Canada (Man, Rice & MacDonald 2009) found no effect of clearcutting on the density of new tree regenerations. Density (stems/ha) of hardwood and conifer regenerations was similar in all treatments (hardwood: ~4,000; conifer: ~1,500). In 1993-1994, four treatments: control (uncut), 50% partial cut, 50% partial cut with removal of residuals after 3 years, and clearcut were replicated in six blocks (112 × 56 m). Data were collected in 1998-2007.
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