Can Potentilla fruticosa Linn. shrubs facilitate the herb layer of heavily grazed pasture on the eastern Tibetan Plateau

• Autorzy: Li P. , Krusi B. , Li S. , Cai X. , Yu F.
• Języki publikacji: EN

Abstrakty

EN

The facilitative and competitive effects of shrubs on herbaceous species have been extensively studied, but little is known about the roles of the shrub distribution patterns in such effects. On a heavily grazed pasture on the Tibetan Plateau, we investigated the effects of Potentilla fruticosa Linn. shrubs of different distribution patterns on the small-scale vegetation pattern of the herb layer. We made same-sized releves at five micro-site types, i.e., beneath and outside the canopies of solitary Potentilla individuals, beneath and outside the canopies of edge-of-patch individuals and at the central openings of torusshaped large Potentilla patches. Shrubs protected certain species by increasing their frequencies of occurrence or flowering. However, only few species benefited from shrubs and more occurred or flowered more frequently outside. The data at community level indicated that species richness and diversity index were higher outside. The patch openings did not benefit species richness, pooled cover, diversity index or evenness of central vegetations. No special species was found growing beneath shrubs exclusively and few species were found with higher occurrences beneath shrubs. Furthermore, no significant difference was found between the two different distribution patterns at either community or species level. Vegetation ordinations confirmed this and vegetations beneath and outside the shrubs were distinguished merely. In conclusion, Potentilla facilitated some species in the herb layer and the patch openings did not show large protective effects. Also, distribution patterns of Potentilla did not affect the difference between vegetations beneath and outside shrub canopies.

Słowa kluczowe

EN

facilitation; high-altitude grassland; natural fence; overgrazing; plant-plant interactions; small-scale vegetation pattern

PL

łąki wysokogórskie; naturalne ogrodzenie; odciążenie; wypas nadmierny

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2011
• Tom: Vol. 59, nr 1
• Strony: 129--140
• Opis fizyczny: Bibliogr. 26 poz.,Rys., tab.,

Twórcy

autor

Li P.

autor

Krusi B.

autor

Li S.

autor

Cai X.

autor

Yu F.

• State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China ; Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Bibliografia

• 1. Anderson M. J. 2003 – PCO: a FORTRAN computer program for principal coordinate analysis –Department of Statistics, University of Auckland, New Zealand.
• 2. Armas C., Pugnaire F. I. 2005 – Plant interactions govern population dynamics in a semiarid plant community – J. Ecol. 93: 978–989.
• 3. Bakker E. S., Olff H., Vandenberghe C., De Maeyer K., Smit R., Gleichman J. M., Vera F. W. M. 2004 – Ecological anachronisms in the recruitme nt of temperate light-demanding tree species in wooded pastures – J. Appl. Ecol. 41: 571–582.
• 4. Belsky A.J. 1994 – Influences of trees on savanna productivity: tests of shade, nutrients, and tree-grass competition – Ecology, 75: 922–932.
• 5. Brooker R. W., Maestre F. T., Callaway R. M., Lortie C. L., Cavieres L. A., Kunstler G., Liancourt P., Tielbörger K., Travis J., Anthelme F., Armas C., Coll L., Corcket E., Delzon S., Forey E., Kikvidze Z., Olofsson J., Pugnaire F., Quiroz C. L., Saccone P., Schiffers K., Seifan M., Touzard B., Michalet R. 2008 – Facilitation in plant communities: the pa st, the present, and the future – J. Ecol. 96:18–34.
• 6. Callaway R. M. 1992 – Effect of shrubs on recruitment of Quercus douglasii and Quercus lobata in California – Ecology, 73: 2118–2128.
• 7. Callaway R. M. 1995 – Positive interactions among plants – Bot. Rev. 61: 306–349.
• 8. Callaway R. M., Kikodze D., Chiboshvili M., Khetsuriana L. 2005 – Unpalatable plants protect neighbors from grazing and increase plant community diversity – Ecology, 86: 1856–1862.
• 9. Callaway R. M., Walker L. R. 1997 – Competition and facilitation: a synthetic approach to interactions in plant communities – Ecology, 78: 1958–1965.
• 10. Cipriotti P. A., Aguiar M. R. 2005 – Interspecific competition interacts with the spatial distribution of a palatable grass to reduce its recruitment – Rangeland Ecol. Manag. 58: 393–399.
• 11. Kent M., Coker P. 1992 – Vegetation description and analysis – Belhaven, London.
• 12. Klanderud K., Totland Ø. 2004 – Habitat depe ndent nurse effects of the dwarf-shrub Dryas octopetala on alpine and arctic plant community structure – Ecoscience, 11: 410–420.
• 13. Klanderud K., Totland Ø. 2005 – The relative importance of neighbours and abiotic environmental conditions for population dynamic parameters of two alpine plant species – J. Ecol. 93: 493–501.
• 14. Lu C. X., Xie G. D., Xiao Y., Yu Y. 2004 - Ecosystem diversity and economic valuation of Qinghai-Tibet Plateau – Acta Ecol. Sin. 24: 2749–2756.
• 15. Oesterheld M., Oyarzábal M. 2004 – Grassto-grass protection from grazing in a semi-arid steppe: facilitation, competition, and mass effect – Oikos, 107: 576–582.
• 16. Olff H., Vera F. W. M., Bokdam J., Bakker E. S., Gleichman J. M., de Maeyer K., Smit R. 1999 – Shifting mosaics in grazed woodlands driven by th e alternation of plant facilitation and competition – Plant Biol. 1: 127–137.
• 17. Olofsson J. 2004 – Positive and negative plantplant interactions in two contrasting arcticalpine plant communities – Arctic, Antarc. Alpine Res. 36: 464–467.
• 18. Rebollo S., Milchunas D. G., Noy-Meir I., Chapman P. L. 2002 – The role of a spiny plant refuge in structuring g razed shortgrass steppe plant communities – Oikos, 98: 53–64.
• 19. Rousset O., Lepart J. 2000 – Positive and negative interactions at different life stages of a colonizing species (Quercus humilis) – J. Ecol. 88: 401–412.
• 20. Smit C., Vandenberghe C., den Ouden J. , Müller-Schärer H. 2007 – Nurse plants, tree saplings and grazing pressure: changes in facilitation along a biotic environmental gradient – Oecologia, 152: 265–273.
• 21. Song M. H., Tian Y. Q., Xu X. L., Hu Q. W., Ouyang H. 2006 – Interactions between root and shoot competition among four plant species in an alpine meadow on the Tibetan Plateau – Acta Oecol. 29: 214–220.
• 22. Tian Y. B., Xiong M. Z., Song G. Y. 2005 – Restoration succession of wetland soils and their changes of water and nutrient in Zoige Plateau – Chinese J. Ecol. 24: 21–25.
• 23. Verdú M., García-Fayos P. 1996 – Nucleation processes in a Mediterranean bird-dispersed plant – Funct. Ecol. 10: 275–280.
• 24. Wang Q., Bao W. K., Yan Z. L., Kumpula T., Colpaert A., Manderscheid A. 2002 - Basic types and characteristics of the western Zoige Meadows and their changes in recent decades – Chinese J. Appl. Environ. Biol. 8: 133–141.
• 25. Yan Y., Zeng Y. Y., Zhang J. H., Zhang J. G., Zhong X. H. 2005 – Diversity of plant species of alpine grassland in Nakchu of Tibet, China – J. Wuhan Univ. 10: 659–664.
• 26. Zhou G.J., Li H. 2003 – Research on the reasons for desertification and countering measures on Zoige Grasslands – J. Sichuan Grasslands, 1: 35–36.