Effect of livestock breed and grazing intensity on grazing systems: 3. Effects on diversity of vegetation

Autor: J. P. Garel, A. J. Rook, M. Scimone, N. Sahin
Přispěvatelé: Agenzia Regionale per lo Sviluppo Rurale, Partenaires INRAE, North Wyke Research Station, Unité Expérimentale des Monts d'Auvergne, Institut National de la Recherche Agronomique (INRA), Department für Nutzpflanzenwissenschaften, Universität für Bodenkultur Wien [Vienne, Autriche] (BOKU), ProdInra, Migration
Rok vydání: 2007
Předmět:
Zdroj: Grass and Forage Science
Grass and Forage Science, Wiley, 2007, 62 (2), pp.172-184
ISSN: 0142-5242
1365-2494
Popis: International audience; Finding an optimal balance between livestock production and grazing impact on plant biodiversity is an important issue in the design of grazing systems. This paper describes a study of the effect of two levels of grazing intensity combined with different animal breeds on plant biodiversity and sward structural diversity of semi-natural grasslands conducted over 3 years in the United Kingdom (UK), France (F), Germany (D) and Italy (I). There were three treatments at each site: moderate grazing intensity with a commercial breed (MC), lenient grazing intensity with a commercial breed (LC) and lenient grazing intensity with a traditional breed (LT). Grazing livestock were cattle in the UK, F and D, and sheep in I. Only grazing intensity had clear effects on vegetation diversity, the effects depending on site-specific vegetation characteristics. In more diverse pastures with finer scale heterogeneity in F and I, there was little effect of the treatments. In less diverse swards with higher grass dominance and coarse-scale heterogeneity, the number of species decreased from initial levels on the lenient grazing intensity treatments (treatments LC and LT), because of increased dominance of grasses reducing the cover of other species, particularly legumes. The structural diversity of the pastures was more affected by level of grazing intensity than botanical diversity. In more diverse, semi-natural grasslands, structural heterogeneity was not affected by the treatments. In less diverse, more productive swards, structural heterogeneity decreased where large patches were initially found on the UK site, and increased where smaller patches were initially found on the D site. It is concluded that management systems to conserve diversity need to consider carefully the background environment, and that more knowledge of the mechanisms involved is needed at farm and landscape scales
Databáze: OpenAIRE
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