Individual study: Laying, coppicing and pollarding initially increased plant species diversity, but after four years had no effect on species richness.
McAdam J.H., Bell A.C. & Gilmore C. (1996) The effects of different hedge restoration strategies on biodiversity. Aspects of Applied Biology, 44, 363-367
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Manage hedgerows to benefit wildlife (includes no spray, gap-filling and laying)
In the same study as McAdam et al. 1994, McAdam et al. 1996 found that although hard coppicing, pollarding (to 1.5 m) and laying initially increased plant species diversity, after four years it had no effect on species richness. In 1991, two treatments had more plant species than the control (25; coppicing: 31-33; pollarding 28); the exception was laying (27). By 1994, although more species were recorded from all treatments than the control (23), none were significantly different (coppicing: 25-26; laying: 25; pollarding: 25). In 1991, the six Environmentally Sensitive Area and eight non-Environmentally Sensitive Area hedges both had a mean of 20 plant species. Environmentally Sensitive Area hedges coppiced with mixed planting had significantly more species than control Environmentally Sensitive Area hedges (23 vs 19). By 1994, Environmentally Sensitive Area sites had slightly higher diversity than non-Environmentally Sensitive Area sites (1992: 21 vs 20; 1994: 22 vs 20).