Elevated mortality of residual trees following structural retention harvesting in boreal mixedwoods

  • Published source details Bladon K.D., Lieffers V.J., Silins U., Landhäusser S.M. & Blenis P.V. (2008) Elevated mortality of residual trees following structural retention harvesting in boreal mixedwoods. The Forestry Chronicle, 84, 70-75.


This study is summarised as evidence for the following.

Action Category

Log/remove trees within forests: effects on mature trees

Action Link
Forest Conservation
  1. Log/remove trees within forests: effects on mature trees

    A replicated, controlled study in boreal mixed wood forest in Alberta, Canada (Bladon et al. 2008) found that harvesting increased tree mortality rate. Annual mortality was higher in harvested than in unharvested plots for balsam poplar Populus balsamifera (harvest: 9.4%; unharvested: 2.3%), paper birch Betula papyrifera (harvested: 8.7%; unharvested: 3.1%) and trembling aspen Populus tremuloides (harvested: 5.8%; unharvested: 1.7%). Annual mortality of white spruce Picea glaucae was similar between treatments (harvested: 2.6%; unharvested: 1.1%).  Fifty five harvested (retaining 10% of the trees) and 29 unharvested plots (100 m radius) were established within a 6,900 ha area. Harvesting was in 2000, data were collected annually 2001-2005.


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