Remove vegetation that could compete with planted peatland vegetation

Overall effectiveness category Unknown effectiveness (limited evidence)
Number of studies: 1
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How is the evidence assessed?

Effectiveness

60%
Certainty

20%
Harms

2%

Calculating overall effectiveness category

Background information and definitions

Removing other plants before or after planting peatland vegetation could reduce competition for space, light and nutrients. Survival and growth of planted vegetation may be improved. Note that abundant competitors, and/or the absence of the vegetation to be introduced, could be symptoms of inappropriate physical conditions that may also need to be managed.

Caution: Existing vegetation may help planted vegetation to establish, protecting it from extreme temperatures, strong sunlight and desiccation.

Key peatland types where this action may be appropriate: bogs, fens/fen meadows, tropical peat swamps.

Related actions: interventions to control competing plants without introducing vegetation (e.g. cutting/mowing or applying herbicide); introduce nurse plants with or without introducing peatland vegetation.

Study locations

Key messages

One study evaluated the effects of removing competing plants to aid planted peatland vegetation. The study was in a bog.
Survival (1 study): One controlled study in a bog in the UK reported that some Sphagnum moss survived when sown (in gel beads) into a plot where purple moor grass had previously been cut, but no moss survived in a plot where grass had not been cut.

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 controlled study in 2010–2013 in a degraded, grassy blanket bog in England, UK (Rosenburgh 2015) reported that some sown Sphagnum moss survived in a plot where purple moor grass Molinia caerulea had previously been cut, but no moss survived in an uncut plot. This result was not tested for statistical significance. After three years, a plot that was flailed before sowing Sphagnum contained 28 Sphagnum clumps (0.03% cover). No Sphagnum survived in an adjacent plot that was not flailed before sowing. In October 2010, two adjacent 3 x 3 m plots were sown with flat-topped bog moss Sphagnum fallax, encapsulated in gel beads (400 beads/m²). Both plots were dominated by purple moor grass, but one was flailed (cut) before sowing. Grass litter was left in place. In September 2013, Sphagnum clumps were identified in each plot and their area was measured.
Study and other actions tested
Referenced paper
Rosenburgh A. (2015) Restoration and recovery of Sphagnum on degraded blanket bog. PhD Thesis. Manchester Metropolitan University.

Please cite as:

Taylor, N.G., Grillas, P. & Sutherland, W.J. (2020) Peatland Conservation. Pages 367-430 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:

Peatland Conservation

Related Actions

Actions	Effectiveness	Studies	Category
Remove vegetation that could compete with planted peatland vegetation Action Link	Unknown effectiveness (limited evidence)	1	Synopsis Link
Remove upper layer of peat/soil (before planting) Action Link	No evidence found (no assessment)	0	Synopsis Link
Use fences or barriers to protect planted vegetation Action Link	No evidence found (no assessment)	0	Synopsis Link