Use prescribed fire after tree planting

Overall effectiveness category Trade-off between benefit and harms
Number of studies: 4
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How is the evidence assessed?

Effectiveness

50%
Certainty

43%
Harms

20%

Calculating overall effectiveness category

Background information and definitions

Prescribed fires are used in the maintenance or restoration of habitats historically subject to occasional ‘wildfires’ that have been suppressed through management. Using prescribed fires in such habitats can improve the establishment of the planted tree seedlings.

Study locations

Key messages

Two of four studies (including one replicated, randomized, controlled study) in Finland, France and the USA found that using prescribed fire after replanting increased the survival and sprouting rate of planted trees. One study found fire decreased planted tree size and one found no effect of prescribed fire on the size and survival rate of planted trees.

About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

A replicated, controlled study in 2001-2008 in boreal forest in Finland (1
Den Herder, Kouki & Ruusila 2009) found no effect of burning on the height or mortality of tree seedlings. Tree heights were similar in burned and unburned plots for silver birch Betula pendula (50-70 cm), rowan Sorbus aucuparia (45-50 cm) and Eurasian aspen Populus tremula (35-40 cm), as were their mortality rates (54-55%, 8-12% and 27-30% respectively). Ten seedlings of each species were planted in 2002-2003 in each of three burned and three unburned plots (10 ×15 m). The burn treatment was applied in 2001. Data were collected in 2002-2008.
Study and other actions tested
Referenced paper
Den Herder M., Kouki J. & Ruusila V. (2009) The effects of timber harvest, forest fire, and herbivores on regeneration of deciduous trees in boreal pine-dominated forests. Canadian Journal of Forest Research, 39, 712-722.
A replicated, controlled study in 1998-2006 in temperate forest in Louisiana, USA (Haywood 2009) found that prescribed fire decreased the height and basal area of longleaf pine Pinus palustris saplings. Longleaf pine height (March burn: 7.7 m; May burn: 8.7 m; July burn: 8.6 m; control: 9.1 m) and basal area/tree (March burn: 72; May burn: 94; July burn: 92; control: 116 cm²) were lowest following a burn in March, intermediate and similar following burns in May and July and highest in control plots. Data were collected in 2006 in three plots (0.07 ha) of each treatment: a burn in March, May or July (prescribed burn in 1999, 2001, 2003 and 2005), and a control (untreated since 1998) treatments. Each of the 12 plots was planted with 196 longleaf pine seedlings in 1993-1994.
Study and other actions tested
Referenced paper
Haywood J.D. (2009) Eight years of seasonal burning and herbicidal brush control influence sapling longleaf pine growth, understory vegetation, and the outcome of an ensuing wildfire. Forest Ecology and Management, 258, 295-305.
A replicated, controlled study in 1999-2005 in Mediterranean shrubland in California, USA (Holmes et al. 2011) found that prescribed fire increased sprouting in planted valley oak Quercus lobata saplings without affecting mortality. The number of new shoots/sapling was higher in burned plots (summer burn: 4.6; spring burn: 4.6; control: 0.8), while the mortality rate was similar between treatments (summer burn: 3%; spring burn: 4%; control: 0%). Data were collected in autumn 2005 in 8-9 blocks (72 m²) of each of: a summer burn (in 2003), a spring burn (in 2004) and control treatments, with an average of ten oak trees/block.
Study and other actions tested
Referenced paper
Holmes K.A., Veblen K.E., Berry A.M. & Young T.P. (2011) Effects of prescribed fires on young valley oak trees at a research restoration site in the Central Valley of California. Restoration Ecology, 19, 118-125.
A replicated, randomized, controlled study in 2005-2006 in Mediterranean Aleppo pine Pinus halepensis woodland in France (Prévosto et al. 2011) found that prescribed burning increased the survival of planted downy oak Quercus pubescens and holly oak Q. ilex seedlings. In plots with woody debris, survival of downy oak (control: <0.1; burned: 0.8 seedlings/sowing point) and holly oak (control: 1.0; burned: 2.2) was higher in burned plots. In contrast, in plots without woody debris, survival was similar between treatments for both downy oak (control: 0.0; burned: 0.2) and holly oak (control: 0.7; burned: 1.2). Grass cover was similar between treatments in plots with woody debris (control: 17%; burned: 10%) and without (control: 22%; burned: 16%). Data were collected in 2006 in 16 plots (14 × 14 m). There were four control and four burned (prescribed fire in 2005) treatment plots with woody debris scattered in the plot, and four of each treatment where the woody debris had been manually removed. All plots were thinned in 2004 (from 410 to 210 trees/ha) and in November 2006 holly oak and downy oak were planted with three acorns spaced 1 m apart at each sowing point.
Study and other actions tested
Referenced paper
Prévosto B., Monnier Y., Ripert C. & Fernández C. (2011) Diversification of Pinus halepensis forests by sowing Quercus ilex and Quercus pubescens acorns: testing the effects of different vegetation and soil treatments. European journal of forest research, 130, 67-76.

Please cite as:

Agra, H., Schowanek, S., Carmel, Y., Smith, R.K. & Ne’eman, G. (2020) Forest Conservation. Pages 323-366 in: W.J. Sutherland, L.V. Dicks, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2020. Open Book Publishers, Cambridge, UK.

Where has this evidence come from?

List of journals searched by synopsis

All the journals searched for all synopses

This Action forms part of the Action Synopsis:

Forest Conservation

Related Actions

Actions	Effectiveness	Studies	Category
Plant a mixture of tree species to enhance the survival and growth of planted trees Action Link	No evidence found (no assessment)	0	Synopsis Link
Mechanically remove understory vegetation after tree planting Action Link	Unlikely to be beneficial	6	Synopsis Link
Add lime to the soil after tree planting Action Link	Unknown effectiveness (limited evidence)	2	Synopsis Link