Abstract
Questions: What is the impact on non-target species of restoration methods to establish Calluna vulgaris on grassdominated moorlands? Location: A Nardus äfrfc/a-dominated moorland in Wales and a Molinia caeru/ea-dominated moorland in Northern England, UK. Methods: Two replicated experiments were established on grass-dominated moorlands. The treatments comprised disturbance (rotavation and trampling by animals), addition of Calluna seed, and three different grazing regimes, together with a no grazing control. Results: The creation of bare ground and addition of seed increased the establishment of the desired dominant shrub, Calluna vulgaris. In the Nardus sward, rotavation and trampling were equally successful in establishing Calluna, but rotavation was more successful in the Molinia sward. Rotavation inhibited the growth of competitive grass species better than trampling. However, the disturbance techniques were detrimental to other components of the plant community, causing a decline in the cover of desirable species such as Vaccinium myrtillus and other dwarf shrub species and a small increase in the occurrence of undesirable species such as Juncus effusus. Grazing also controlled competitive grass species: Festuca ovina decreased in cover at a grazing intensity of 1.5 ewes/ha; Molinia caerulea and Agrostis spp. declined when cattle were included in the grazing regime, but increased in cover when ungrazed or when grazed at 1.5 ewes/ha. Conclusions: When restoration concentrates on the establishment of one or a few species, it is important to monitor how the techniques used affect the rest of the plant community - particularly with regard to losses of desirable species or increases in undesirable species.
Original language | English |
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Pages (from-to) | 81-91 |
Number of pages | 11 |
Journal | Applied Vegetation Science |
Volume | 12 |
Issue number | 1 |
Early online date | 26 Feb 2009 |
DOIs | |
Publication status | Published - Feb 2009 |
Bibliographical note
The work was carried out as part of a project funded by the UK Department for Environment, Food and Rural Affairs, English Nature and the Countryside Council for Wales: “Determining environmentally sustainable and economically viable grazing systems for the restoration and maintenance of heather moorland in England and Wales (BD1228)”. We thank the ADAS staff at Pwllpeiran and Redesdale for carrying out the disturbance and fencing treatments and managing the animals. Linda Turner helped with the fieldwork and David Elston provided statistical advice. James Bullock and Rob Brooker provided helpful comments on an earlier version of this manuscript.Keywords
- Cattle
- Competition
- Disturbance
- Grazing
- Microsite limitation
- Molinia caerulea
- Nardus stricta
- Restoration success
- Rotavation
- Seed limitation
- Trampling