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Providing evidence to improve practice

Individual study: Long-term plant community changes in managed fens in Ohio, USA

Published source details

Barry M.J., Barbara A.K. & De Szalay F. (2008) Long-term plant community changes in managed fens in Ohio, USA. Aquatic Conservation: Marine and Freshwater Ecosystems, 18, 392-407


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Use herbicide to control problematic plants Peatland Conservation

A replicated, controlled, before-and-after study in 1986–2000 in two shrub-invaded fens in Ohio, USA (Barry et al. 2008) found that applying herbicide to shrubs (along with burning and cutting) altered plant community composition and prevented increases in plant species richness, but had no effect on shrub cover. The overall plant community composition changed significantly over time along transects with and without shrub control, but they accumulated different sets of species (data reported as a graphical analysis). Plant species richness was stable in the fen with shrub control (before: 12.8; after 14 years: 12.7 species/m2) but increased in the fen without shrub control (before: 12.5; after 14 years: 14.6 species/m2). Woody plant cover increased similarly in fens with shrub control (before: 46%; after 11 years: 62%) and without shrub control (before: 20%; after: 28%). From 1986, encroaching shrubs were managed using ad hoc herbicide application, burning and cutting. The study does not distinguish between the effects of these interventions. Three of four transects were managed in one fen (‘with shrub control’). Only one of four transects were managed in the other fen (‘without shrub control’). In summer 1986 (before shrub control began), 1999 and 2000, vegetation cover was estimated in 1 m2 quadrats along the eight transects. Shrub cover was estimated from aerial photographs.

Use cutting to control problematic large trees/shrubs Peatland Conservation

A replicated, controlled, before-and-after study in 1986–2000 in two shrub-invaded fens in Ohio, USA (Barry et al. 2008) found that cutting shrubs (along with burning and herbicide application) altered plant community composition and prevented increases in plant species richness, but had no effect on shrub cover. The overall plant community composition changed significantly over time along transects with and without shrub control, but they accumulated different sets of species (data reported as a graphical analysis). Plant species richness was stable in the fen with shrub control (before: 12.8; after 14 years: 12.7 species/m2) but increased in the fen without shrub control (before: 12.5; after 14 years: 14.6 species/m2). Woody plant cover increased similarly in fens with shrub control (before: 46%; after 11 years: 62%) and without shrub control (before: 20%; after: 28%). From 1986, encroaching shrubs were managed using ad hoc cutting, burning and herbicide application. The study does not distinguish between the effects of these interventions. Three of four transects were managed in one fen (‘with shrub control’). Only one of four transects were managed in the other fen (‘without shrub control’). In summer 1986 (before shrub control began), 1999 and 2000, vegetation cover was estimated in 1 m2 quadrats along the eight transects. Shrub cover was estimated from aerial photographs.

(Summarised by Nigel Taylor)

Use prescribed fire to control problematic plants Peatland Conservation

A replicated, controlled, before-and-after study in 1986–2000 in two shrub-invaded fens in Ohio, USA (Barry et al. 2008) found that burning shrubs (along with cutting and herbicide application) altered plant community composition and prevented increases in plant species richness, but had no effect on shrub cover. The overall plant community composition changed significantly over time along transects with and without shrub control, but they accumulated different sets of species (data reported as a graphical analysis). Plant species richness was stable in the fen with shrub control (before: 12.8; after 14 years: 12.7 species/m2) but increased in the fen without shrub control (before: 12.5; after 14 years: 14.6 species/m2). Woody plant cover increased similarly in fens with shrub control (before: 46%; after 11 years: 62%) and without shrub control (before: 20%; after: 28%). From 1986, encroaching shrubs were managed using ad hoc burning, cutting and herbicide application. The study does not distinguish between the effects of these interventions. Three of four transects were managed in one fen (‘with shrub control’). Only one of four transects were managed in the other fen (‘without shrub control’). In summer 1986 (before shrub control began), 1999 and 2000, vegetation cover was estimated in 1 m2 quadrats along the eight transects. Shrub cover was estimated from aerial photographs.

(Summarised by Nigel Taylor)