Changes of Species Diversity and Functional groups in Relation to Grazing in Rangelands of Nodushan, Yazd province

Authors

Abstract

Grazing of Livestock is one of the factors having influence on the structure and dynamics of the range land vegetation. Grazing management is a vital factor to control the intensity of the rangeland ecosystems degradation. In this study, plant functional traits and diversity and richness properties were used to assess the vegetation response to different grazing intensities. This was done in Nodushan Rangelands in Yazd province. Vegetation cover was recorded under three grazing intensities (heavy, moderate and light rates grazing). Results showed that the cover percentage of Compositeae and Papilionaceae, significantly showed a negative response to grazing intensity while Gramineae was not significantly affected by different grazing pressure. Some functional groups such as annuals, Geophytes, Chamaephytes, Shrubs and Forbs significantly reduced from light to heavy rates. On the other hands, Therophyts and hemicryptophytes were increased. The other findings of this study showed that decreaser plants significantly had less cover under heavy grazing whereas increaser plants had greater cover under heavy grazing. Also diversity and richness had no significant response to grazing intensity. The results of this research showed that plant traits may change under grazing intensity. In conclusion, we recommend using these traits that show the highest response along the grazing as intensity gradient in the arid rangelands.

Keywords


1. Ajorloo, M., 2006. Effects of distance from critical points on the soil and vegetation characteristics of rangelands. Pajoohesh& Sazandegi Journal 74,170-174. (In Persian) 2. Arzani, H., Fatahi, M., Ekhtesasi, M.R., 1999. Investigation on quantitative and qualitative changes in rangeland vegetation of Poshtkuh area of Yazd during last decade (1986-1998). Pajoohesh& Sazandegi Journal 44,31-35. (In Persian) 3. Arzani, H., Abdolahi, J., Frahpoor, M., Azimi, M., Jafari, A., Moalemi, M., 2003. Investigation on range condition trend during five years period in Yazd province,Rangeland and Desert Journal of Iran 12 (3), 263-283. (In Persian) 4. Angassa, A., Oba, G., 2010. Effects of grazing pressure, age of enclosures and seasonality on bush cover dynamics and vegetation composition in southern Ethiopia. Journal of Arid Environments 74, 111–120. 5. AnnVerdoodt, S.M., 2009. Analysis of two enclosure management strategies in degraded rangeland of semi-arid Kenya Journal of Agriculture, Ecosystems and Environment 129, 332–339. 6. Badri poor, H., 1998. Effects of distance from trough on the range condition and vegetation characteristics. Thesis presented for M.Sc. degree in Renge Management,Tehran University, 90 pp. (In Persian) 7. Bastin, G.N., Pickup, G,. Chewing, V.H., Pearce, G., 1993. Land degradation assessment in arid area by using of grazing gradient and remotely sensed data, Rangeland Journal 15(2), 297–305. 8. Erfanzadeh, R., Omidipour, R., Faramarzi, M., 2015.Variation of plant diversity components in different scales in relation to grazing and climatic conditions. Plant Ecology & Diversity, 8(4) 537- 545. 9. Fakhimi, E., Dianati Tilaki, Gh., Mesdaghi, M., Naderi Nasr abad, H., 2009. The effect of water point distances on species diversity and species composition in dry Rangelands of Nodushan, Yazd Province, Iran, Rangelands Journal 3(1), 41-52. (In Persian) 10. Gholami, P., 2011. Vegetation and Soil Seed Bank Changes in Different Grazing Intensities (Case Study: Mahoor, Mamasani Rangelands, Fars Province). Msc Thesis, Sari University of Agriculture Sciences & Natural Resources. 162 pp. (In Persian) 11. Gholami, P., Ghorbani, J. and Shokri, M., 2013. Species diversity changes of standing vegetation and soil seed bank in exclosure and grazing area (Case study: Mahoor Mamasani Rangelands, Fars Province). Iranian Journal of Range and Desert Research, 20 (4): 745- 755. (In Persian) 12. Hickman, K.R., Hartnett D.C., Cochran, R.C., Owensby. C.E., 2004. Grazing management effects on plant species diversity in tallgrass prairie. Journal of Range Management 57, 58-65. 13. Holechek, J.L., Pieper, R.D., Herbel, C.H., 1995. Range management,Principal and practices. 2nd edition, Prentice Hall, USA. 14. Huston, M.A., 1979. A general hypothesis of species diversity. American Naturalist 113, 81-101. 15. Hoshino, A., Yoshihara, Y., Sasaki, T., Okayasu, T., Jamsran , U., Okuro, T. & Takeuchi, K., 2009. Comparison of vegetation changes along grazing gradients with different numbers of livestock. Journal of Arid Environment 73, 687-690. 16. Hossienzadeh, G., Jalilvand, H., Tamartash, R., 2008. Vegetation Cover Changes and Some Chemical Soil Properties in Pastures with Different Grazing Intensities. Iranian journal of Range and Desert Reseach 14 (4), 500-512. (In Persian) 17. Khalifezadeh, R., 2005. Effects of distance from trough on the vegetation characteristics in rangelands of Semnan province. Msc Thesis, Gorgan University of Agriculture Sciences & Natural Resources, 72 pp. (In Persian) 18. Kohandel, A., Chaichi, M., Mohseni Saravi., M., Zahedi Amiri, Gh., 2007. Effect of Different Grazing Intensities on Plant Cover Composition, and on Moisture Content, Mechanical Resistance and Infiltration Rate of the Soils, Savojbolagh Rangelands. Journal of the Iranian Natural Resarch 59, 1001-1011. (In Persian) 19. Lavorel, S., Touzard, B., Lebreton, J.D & Clement, B., 1998. Identifying functional group for response to disturbance in an abandoned pasture. Acta Oecologica 19(3), 227-240. 20. Mekuria, W., Veldkamp, E., Haile, M., Nyssen, J., Muys, B., Gebrehiwot, K., 2007. Effectiveness of exclosures to restore degraded soils as a result of overgrazing in Tigray, Ethiopia. Journal of Arid Environments 69, 270–28. 21. Mesdaghi M., 2000. Investigation on richness of species and life forms at three utilization in the semi-steppic north-east grasslands of Iran. Agriculture& Natural Resource Journal of Iran 7(3),55-61. (In Persian) 22. Mesdaghi, M., 2001. Range Management in Iran. Astan Ghods Razavi Press, 326 p. (In Persian) 23. Mesdaghi, M., 2005. Plant ecology, Jahad daneshgahi of Mashhad press, 187p. (In Persian) 24. Mirzaali, E., Mesdaghi, M., Erfanzadeh, R., 2006. The study of effect of exclosure on vegetation and soil surface in saline ranges of Gomishan, Golestan province. Journal of Agriculture and Natural resourse of Gorgan13(2), 55- 64. (In Persian) 26. Muller-Dombois, D., Ellenberg,H., 1974. Aims and methods of regetation ecology wiley,New York. 27. Nazari, S., Ghorbani, J., Zali, S.H. and Tamartash, R. 2016. The effect of livestock grazing and invasion of Stachys byzantina on vegetation structure indices (Case study: mountain grassland in the northern slopes of Alborz). Rangeland, 10 (1): 27- 40. (In Persian) 28. Paruelo, J.M., 1996. Relative abundance of plant functional types in grassland and shrrublands of north America. Ecological Applications 6(4), 1212-1224. 29 Pueyo, Y., Alados, C.‌L., Ferrer-Benimeli, C., 2006. Is the analysis of plant community structure better than common species-diversity indices for assessing the effects of livestock grazing on a Mediterranean arid ecosystem?. Journal of Arid Environment 64, 698-712. 30. Ruiz-Jaen, M.C., Aide, T.M., 2005. Restoration success: how is it being measured? Restoration Ecology 13, 569–577. 31. Ruthven, D.C., 2007. Grazing effect on forb diversity and abundance in a honey mesquite Parkland. Journal of Arid Environmment 68, 668-677. 32. Shokri, M., Tavili, A., Mollayi Kandelusi, J., 2008. Effects of grazing intensity on plant species richness in Alborz mountains rangelands, Rangelands Journal 1(3), 269-278. (In Persian) 33. Van der Maarel, E., 1988. Species diversity in plant communities in relation to structure and dynamics. In: Diversity and pattern in plant communities (eds. H.J, During , M.J.A, Werger and H.J, Williams), SPB Academic Publishing, The Hague, The Netherlands. pp: 1-14. 34. Wang, J., Zhong, M., Wu, R., Dong, Q., Wang K. and Shao, X., 2016. Response of plant functional traits to grazing for three dominant species in alpine steppe habitat of the Qinghai–Tibet Plateau, China. Ecological Research, 31: 515–524. 35. Wilson, S.D., Tilman, D., 2002. Quadratic variation in old-field species richness along gradients of disturbance and nitrogen. Journal of Ecology 83, 492–50. 36. Yayneshet , T. Eik, L.O., Moe. S.R., 2009. The effects of exclosures in restoring degraded semi-arid vegetation in communal grazing lands in northern Ethiopia. Journal of Arid Environments 73, 542–549. 37. Yuguang, B., Abouguendia, Z., Redmann, R.E., 2001. Relationship between plant species diversity and grassland condition. Journal of range Management 54, 177-183. 38. Zhao, W.Y. ,Li, J.L., Qi, J.G., 2007. Change in Vegetation Diversity and Structure in Response to Heavy Grazing Pressure in the Northen Tianshan Mountains, China, , Journal of Arid Enviroments 68, 465-479.