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What is the effect of prescribed burning in temperate and boreal forest on biodiversity, beyond pyrophilous and saproxylic species?: A systematic review
Mistra EviEM, Stockholm Environment Institute, Stockholm; University of Exeter Medical School, Truro, United Kingdom.
Mistra EviEM, Stockholm Environment Institute, Stockholm; University of Johannesburg, Johannesburg, South Africa.
Mistra EviEM, Stockholm Environment Institute, Stockholm.
Carleton University, Ottawa, Canada.
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2018 (English)In: Environmental Evidence, ISSN 2047-2382, E-ISSN 2047-2382, Vol. 7, no 1, article id 19Article in journal (Refereed) Published
Abstract [en]

Background: While the effects of prescribed burning on tree regeneration and on pyrophilous and/or saproxylic species are relatively well known, effects on other organisms are less clear. The primary aim of this systematic review was to clarify how biodiversity is affected by prescribed burning in temperate and boreal forests, and whether burning may be useful as a means of conserving or restoring biodiversity, beyond that of pyrophilous and saproxylic species. Methods: The review examined primary field studies of the effects of prescribed burning on biodiversity in boreal and temperate forests in protected areas or under commercial management. Non-intervention or alternate levels of intervention were comparators. Relevant outcomes were species richness and diversity, excluding that of pyrophilous and saproxylic species. Relevant studies were extracted from a recent systematic map of the evidence on biodiversity impacts of active management in forests set aside for conservation or restoration. Additional searches and a search update were undertaken using a strategy targeted to identify studies focused on prescribed burning interventions. Grey literature and bibliographies of relevant published reviews were also searched for evidence. Studies were assessed for internal and external validity and data were extracted, using validity assessment and data extraction tools specifically designed for this review. Studies were presented in a narrative synthesis and interactive map, and those which were suitable were quantitatively synthesised using meta-analyses, subgroup analysis and meta-regression. Results: Searches generated a total of 12,971 unique records. After screening for relevance, 244 studies (from 235 articles) were included in this review. Most studied forests were located in the USA (172/244), with the rest located in Canada, Europe and Australia. Eighty-two studies reporting 219 comparisons were included in the quantitative synthesis. Within the meta-analyses for each group of taxa, we identified a small to moderate volume of evidence, and heterogeneity was ubiquitous. Prescribed burning had significant positive effects on vascular plant richness, non-native vascular plant richness, and in broadleaf forests, herbaceous plant richness. Time since the burn, forest type and climate zone were significant moderators predicting the effect of burning on herbaceous plant richness. No other significant relationships were identified. Conclusions: Knowledge gaps exist for studies outside North America, in mixed forests and for non-plant organism outcomes. We identify a need to apply study designs consistently and appropriately, minimising the impact of confounding factors wherever possible, and to provide extensive detail in study reports. We recommend that researchers build long-term datasets charting the impacts of prescribed burning on succession. The lack of consistent findings was likely due to high inter-study heterogeneity, and low numbers of comparable studies in each quantitative synthesis. We found no consistent effects of moderators, and were unable to test the effect of many potential moderators, due to a lack of reporting. Rather than making any general recommendations on the use of prescribed burning for biodiversity restoration, we provide an evidence atlas of previous studies for researchers and practitioners to use. We observe that outcomes are still difficult to predict, and any restoration project should include a component of monitoring to build a stronger evidence base for recommendations and guidelines on how to best achieve conservation targets. Prescribed burning may have harmful effects on taxa that are conservation-dependent and careful planning is needed. 

Place, publisher, year, edition, pages
2018. Vol. 7, no 1, article id 19
Keywords [en]
Controlled burn, Disturbance, Fire regime, Forest conservation, Forest reserve, Forest set-aside, Habitat management, Prescribed burn
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:miun:diva-34573DOI: 10.1186/s13750-018-0131-5ISI: 000446169200001Scopus ID: 2-s2.0-85052055619OAI: oai:DiVA.org:miun-34573DiVA, id: diva2:1252426
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-11-15Bibliographically approved

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Jonsson, Bengt-Gunnar

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