Once burned, twice shy: repeat fires reduce seed availability and alter substrate constraints on Picea mariana regeneration

  • Published source details Brown C.D. & Johnstone J.F. (2012) Once burned, twice shy: repeat fires reduce seed availability and alter substrate constraints on Picea mariana regeneration. Forest Ecology and Management, 266, 34-41.


This study is summarised as evidence for the following.

Action Category

Use prescribed fire: effects on young trees

Action Link
Forest Conservation
  1. Use prescribed fire: effects on young trees

    A site comparison study in 1994-2007 in subarctic boreal forest in Yukon Territory, Canada (Brown & Johnstone 2012) found that prescribed burning with long intervals between burns increased the density of black spruce Picea mariana seedlings. The density of seedlings was higher following burns with long intervals between (8.3 seedlings/m2) than with short intervals between burns and mature forest sites (0.6 seedlings/m2 in both). Eight 30 × 30 m plots were established within each of three fire history sites: mature forest (previous fire about 77 years ago); long interval between burns (fire in 2005) and short intervals between burns (fire in both 1990/91 and 2005).  Seedlings were counted in ten 0.25 m2 subplots in each plot in 2008, 2009 and 2010.


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 20

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 Bat Conservation InternationalPeople trust for endangered speciesVincet Wildlife Trust