Biodiversity & Conservation

, Volume 10, Issue 1, pp 119–135 | Cite as

A six-year experimental restoration of biodiversity by shrub-clearing and grazing in calcareous grasslands of the French Prealps

  • Luc Barbaro
  • Thierry Dutoit
  • Philippe Cozic
Article

Abstract

The conservation of dry calcareous grasslands in the French Prealps strongly depends on the maintenance of low-intensity farming systems supported by agri-environmental schemes. An experimental assessment of the effect of current agro-pastoral management on the biodiversity of plant communities was conducted during a six-year permanent plot survey in four sites with contrasting habitat conditions (mesic to xeric). Analyses of species changes showed: (i) a strong increase in species richness and open grassland species frequencies four years after shrub-clearing, and (ii) a noticeable recovery of rare annuals and perennial species of conservation interest establishing in gaps created by grazing. At the community level, the restoration effect was evaluated by a between-year Correspondence Analysis, explaining 10.9% of the total floristic variability versus 29.5% for the site effect (between-site CA). Species ordination by between-year CA showed similar trajectories of vegetation changes during restoration despite different habitat conditions and grazing regimes between sites. The successful restoration of prealpine calcareous grasslands was explained by the availability of seed sources during the study in adjacent grazed or mown grasslands. Thus, restoration assessment should focus on dispersal possibilities and functional roles of species rather than species richness only. Finally, the spatial (i.e. the area of patches that need to be restored) and temporal (i.e. the frequency of shrub-clearing) implications for the large-scale conservation of prealpine calcareous grasslands by current agro-pastoral management are discussed.

biodiversity calcareous grasslands grazing restoration shrub-clearing 

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References

  1. Bakker JP,Bakker ES,Rosén E,Verweij GL andBekker RM (1996a) Soil seed bank composition along a gradient from dry alvar grassland to Juniperus shrubland. Journal of Vegetation Science 7: 165–176Google Scholar
  2. Bakker JP,Olff H,Willems JH andZobel M (1996b) Why do we need permanent plots in the study of long-term vegetation dynamics? Journal of Vegetation Science 7: 147–156Google Scholar
  3. Barbaro L andCozic P (1998) Organisation agro-écologique des pelouses et landes calcicoles du Parc Naturel Régional du Vercors. Ecologie 29: 443–457Google Scholar
  4. Bobbink R andWillems JH (1993) Restoration management of abandoned chalk grassland in the Netherlands. Biodiversity and Conservation 2: 616–626Google Scholar
  5. Bullock JM,Clear Hill B,Dale MP andSilvertown J (1994) An experimental study of the effects of sheep grazing on vegetation change in a species-poor grassland and the role of seedling recruitment into gaps. Journal of Applied Ecology 31: 493–507Google Scholar
  6. Bullock J (1996) Plants. In: Sutherland WJ (ed) Ecological Census Techniques: A Handbook, pp 111-138. Cambridge University Press, CambridgeGoogle Scholar
  7. Bullock JM andPakeman RJ (1997) Grazing of lowland heath in England: management methods and their effects on heathland vegetation. Biological Conservation 79: 1–13Google Scholar
  8. Dolédec S andChessel D (1997) Between-and within-groups principal component analyses. Documentation de la programmathèque ADE-4, University Lyon IGoogle Scholar
  9. Dolman PM andSutherland WJ (1992) The ecological changes of Breckland grass heaths and the consequences of management. Journal of Applied Ecology 29: 402–413Google Scholar
  10. Dutoit T andAlard D (1995) Permanent seed banks in chalk grassland under various management regimes: their role in the restoration of species-rich plant communities. Biodiversity and Conservation 4: 939–950Google Scholar
  11. Dzwonko Z andLoster S (1998) Dynamics of species richness and composition in a limestone grassland restored after tree cutting. Journal of Vegetation Science 9: 387–394Google Scholar
  12. Fischer SF,Poschlod P andBeinlich B (1996) Experimental studies on the dispersal of plants and animals on sheep in calcareous grasslands. Journal of Applied Ecology 33: 1206–1222Google Scholar
  13. Fischer M andStöcklin J (1997) Local extinctions of plants in remnants of extensively used calcareous grasslands 1950-1985. Conservation Biology 11: 727–737Google Scholar
  14. Gaultier C (1989) Relations entre pelouses eurosibériennes (Festuco-Brometea) et groupements méditerranéens (Ononido-Rosmarinetea). Etude régionale (Diois) et synthèse sur le pourtour méditerranéen Nord-Occidental. PhD Thesis, University Paris XI OrsayGoogle Scholar
  15. Gigon A andLeutert A (1996) The dynamic keyhole-key model of coexistence to explain diversity of plants in limestone and other grasslands. Journal of Vegetation Science 7: 29–40Google Scholar
  16. Kiefer S andPoschlod P (1996) Restoration of fallow or afforested calcareous grasslands by clear-cutting. In: Settele J,Margules CR,Poschlod P andHenle K (eds) Species Survival in Fragmented Landscapes, pp 219-229. Kluwer Academic Publishers, Dordrecht, The NetherlandsGoogle Scholar
  17. Kollmann J andPoschlod, P. (1997) Population processes at the grassland-scrub interface. Phytocoenologia 27: 235–256Google Scholar
  18. Mitchley J andWillems JH (1995) Vertical canopy structure of Dutch chalk grasslands in relation to their management. Vegetation 117: 17–27Google Scholar
  19. Mortimer SR,Hollier JA andBrown VK (1998) Interactions between plant and insect diversity in the restoration of lowland calcareous grasslands in southern Britain. Applied Vegetation Science 1: 101–114Google Scholar
  20. Muller S,Dutoit T,Alard D andGrévilliot F (1998) Restoration and rehabilitation of species-rich grassland ecosystems in France: a review. Restoration Ecology 6: 94–101Google Scholar
  21. Niemelä J andBaur B (1998) Threatened species in a vanishing habitat: plants and invertebrates in calcareous grasslands in the Swiss Jura mountains. Biodiversity and Conservation 7: 1407–1416Google Scholar
  22. Poschlod P,Kiefer S,Tränkle U,Fischer S andBonn S (1998) Plant species richness in calcareous grasslands as affected by dispersability in space and time. Applied Vegetation Science 1: 75–90Google Scholar
  23. Stampfli A andZeiter M (1999) Plant species decline due to abandonment of meadows cannot easily be reversed by mowing. A case study from the southern Alps. Journal of Vegetation Science 10: 151–164Google Scholar
  24. ter Braak CJF andWiertz J (1994) On the statistical analysis of vegetation change: a wetland affected by water extraction and soil acidification. Journal of Vegetation Science 5: 361–372Google Scholar
  25. Thioulouse J,Chessel D,Dolédec S andOlivier JM (1997) ADE-4: a multivariate analysis and graphical display software. Statistics and Computing 7: 75–83Google Scholar
  26. Ward LK (1990) Management of grassland-scrub mosaïcs. In: Hillier SH,Walton DWH andWells DA (eds) Calcareous Grassland: Ecology and Management, pp 134-139. Bluntisham Books, Bluntisham, HuntingdonGoogle Scholar
  27. Ward LK andJennings RD (1990) Succession of disturbed and undisturbed chalk grassland at Aston Rowant National Nature Reserve: details of changes in species. Journal of Applied Ecology 27: 913–923Google Scholar
  28. Watt TA,Treweek JR andWoolmer FS (1996) An experimental study of the impact of seasonal sheep grazing on formerly fertilized grassland. Journal of Vegetation Science 7: 535–542Google Scholar
  29. Willems JH (1995) Soil seed bank, seedling recruitment and actual species composition in an old and isolated chalk grassland site. Folia Geobot. Phytotax. 30: 141–156Google Scholar
  30. Willems JH andBik LPM (1998) Restoration of high species density in calcareous grassland: the role of seed rain and soil seed bank. Applied Vegetation Science 1: 91–100Google Scholar
  31. Zobel M,Suurkask M,Rosén E andPärtel M (1996) The dynamics of species richness in an experimentally restored calcareous grassland. Journal of Vegetation Science 7: 203–210Google Scholar

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Luc Barbaro
    • 1
  • Thierry Dutoit
    • 2
  • Philippe Cozic
    • 1
  1. 1.Division Agriculture et Milieux MontagnardsCemagref GrenobleSt Martin d'HeresFrance
  2. 2.Institut Méditerranéen d'Ecologie et de PaléoécologieUniversité de ProvenceMarseille Cedex 20France

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