Study

Threshold effects of variable retention harvesting on understory plant communities in the boreal mixedwood forest

  • Published source details Craig A. & Macdonald S.E. (2009) Threshold effects of variable retention harvesting on understory plant communities in the boreal mixedwood forest. Forest Ecology and Management, 258, 2619-2627.

Actions

This study is summarised as evidence for the following.

Action Category

Use clearcutting to increase understory diversity

Action Link
Forest Conservation
  1. Use clearcutting to increase understory diversity

    A replicated, randomized, controlled study in 1998-2006 in boreal mixed wood forest in Alberta Canada (Craig & Macdonald 2009) found that clearcutting and high thinning intensity increased the cover of understory vegetation, particularly of grasses. The average percentage cover of all species under the canopy was 67% in clearcut and high thinning intensity plots (0-10% retention) and 55% in the three low thinning intensities and uncut plots (20-100% retention). The average percentage cover of grasses was 14% in clearcut and high thinning intensity plots and 4% in the three low thinning intensities and uncut plots. Species richness was unaffected by retention level. In winter 1998-1999, six 10 ha compartments within each of three blocks (∼2 km2) were randomly assigned to six harvesting treatments: clearcutting (0% retention), 10% retention, 20% retention, 50% retention, 75% retention and uncut (100% retention). Sampling was conducted in summer 2006 in twenty 1×1 m plots in each of the 18 compartments.

     

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust