Effects of Intermediate-Term Grazing Rest on the Vegetation Characteristics of Steppe Rangelands
الموضوعات :Naser Baghestani 1 , Mohammadtaghi Zare 2 , Ehsan Zandi 3 , Sedighe Zarekia 4
1 - Forest and Rangeland Research Division, Yazd Agricultural and Natural Resources Research and Education Center
2 - Yazd Agriculture and Natural Resources Research and Education Center
3 - Rangeland Research Division, Research Institute of Forests and Rangelands,
4 - Yazd Agricultural and Natural Resources Research and Education Center
الکلمات المفتاحية: Forage production, Salsola rigida, Grazing intensity, Stipa barbata, Percent vegetation cover,
ملخص المقالة :
The effects of grazing rest on rangelands are different in different climates and knowledge of these effects is necessary to apply correct management. For this purpose, this study was carried out on the percent vegetation cover (PVC) and forage production (FP) of range species at the Nir Range Research Station in Yazd province as a model of steppe rangelands of Iran. In the study area, different grazing intensities were applied until the end of the grazing season of 2006 and from then on, the whole area was under exclusion. PVC and FP were measured in each of the experimental plots once in May 2007 and again seven years later in May 2014. The results of vegetation data analysis in 2007 showed that the heavy grazing intensity applied in the past caused the reduced PVC and FP of two desirable species i.e. Salsola rigida and Stipa barbata as well as increased PVC and FP of Launaea acanthodes and increased forage production of Scariola orientalis as undesirable species. The results of vegetation data analysis in 2014 showed that the lowest PVC and FP of S.rigida was recorded in the experimental plots under heavy grazing intensity. In other experimental plots, there was no significant difference in PVC and FP of this species (p>0.05). There was no significant difference between PVC and FP of other species and total species in different experimental plots (p>0.05). Thus, during the 7-year rest period, although the negative effect of grazing on S.barbata is resolved, it remains on S.rigida and the resulting degradation is not completely compensated during this period and needs more time. Therefore, S.barbata showed better resistance to grazing as compared with S.rigida. According to the results, if steppe rangelands are grazed heavily in the short-term, intermediate-term grazing rest could improve the vegetation to the previous state.
Abdelsalam, M., Abdalla, N., Abdelkreim, M., Ibrahim, M., Mohammed, M., 2017. The Impact of Continuous Grazing on Natural Rangeland in Alazzazah area Blue Nile State, Sudan. Jour. Rangeland Science. 7(4): 309-315.
Arzani, H., Abedi, M., 2015. Rangeland Assessment, Vegetation Measurement Tehran University Publication, Tehran, Iran, 305 pp. (In Persian).
Arzani, H, fattahi, M, Ekhtesasi, M. R., 1999. Investigation on quantitative and qualitative changes in rangeland vegetation of Poshtkuh area of Yazd during last decade. Jour. Pajohesh & Sazandegi, 44: 31-35. (In Persian).
Baghestani Maybodi, N., 1993. The study of plant communities based on geomorphologic units and soil in Nodushan drainage basin area Yazd province, M.Sc. thesis, University of Tehran. Iran, 293pp. (In Persian).
Baghestani Maybodi, N., 2003. Study of short term effects of different Goat’s grazing intensities on some aspects of vegetation and animal performance in Yazd steppic rangelands. PhD. thesis, University of Tehran, Iran, 214pp. (In Persian).
Baghestani maybodi, N., Zare, M. T., Abdollahi, J., 2006. Effects of 2-decade livestock exclusion on vegetation changes in steppic rangelands of Yazd province. Iranian Jour. Range and Desert Research, 13: 337-346. (In Persian).
Belgacem, A.O., Tarhouni, M., Louhaichi, M., 2013. Effect of protection on plant community dynamics in the Mediterranean arid zone of southern Tunisia: a case study from Bou Hedma national park. Land Degrad. Dev. 24, 57–62.
Callaway, R., Kikodze, D., Chiboshvili, M., Khetsurianie, L., 2005. Unpalatable Plants Protect Neighbors from Grazing and Increase Plant Community Diversity. Ecology, 86(7):1856-1862.
Cody, M. L., 2000. Slow-motion population dynamics in Mojave Desert perennial plants. Jour. Vegetation Science, 11: 351–358.
Curtin, C., 2002. Livestock grazing, rest and restoration in arid landscapes. Conservation Biology, 16:840-842.
Davies, K. W., Vavra, M., Schultz, B., Rimbey, N., 2014. Implications of Longer Term Rest from Grazing in the Sagebrush Steppe. Jour. Rangeland Applications, 1: 14-34.
Ektova, S. N., Morozova, L. M., 2015. Rate of recovery of lichen-dominated tundra vegetation after overgrazing at the Yamal Peninsula. Czech Polar Reports, 5: 27-32.
Fox, M. A., Eddleman, L. E., 2003. A time comparison study of vegetation on the Island Research Natural Area in central Oregon. Northwest Science, 77: 246-254.
Guo, Q., 2004. Slow recovery in desert perennial vegetation following prolonged human disturbance. Vegetation Science, 15: 757–762.
Grime, J., 2001. Plant strategies, vegetation processes and ecosystem properties. 2nd ed. Chichester: Wiley; 456 p.
Holechek, J. L., Baker, T. T., Boren, J. C., Galt, D., 2006. Grazing impacts on rangeland vegetation: what we have learned. Rangelands, 28 7–13
Holechek, J. L., Pieper, R.D., Herbel, C. H., 2010. Range management، principles and practices (sixth edition). Pearson, 456pp.
Kairis, O., Karavitis, C., Salvati, L., Kounalaki, A. & Kosmas, K., 2015. Exploring the impact of overgrazing on soil erosion and land degradation in a dry Mediterranean Agro-Forest Landscape (Crete, Greece). Arid Land Resource Management, 29: 360–374.
Kashki, M.T., Shahmoradi, A.A. Zandi Esfahan, E., 2015. Studying Short-Time Dynamics of Vegetation and Soil Organic Carbon in a Semiarid Rangeland (Case Study: Zharf, Khorasan Province, Iran). Journal of Rangeland Science, 5 (1); 10-19.
Lawley, V., Parrot, L., Lewis, M., Sinclaira, R., Ostendorf, B., 2013. Self-organization and complex dynamics of regenerating vegetation in an arid ecosystem: 82 years of recovery after grazing. Jour. Arid Environment, 88: 156–164.
Loydi, A., Zalba, S. M., Distel, R. A., 2012. Vegetation change in response to grazing exclusion in montane grasslands, Argentina. Plant Ecology and Evolution, 145:313-322.
Manier, D. J, Hobbs, N. T., 2006. Large herbivores influence the composition and diversity of shrub-steppe communities in the Rocky Mountains, USA. Oecologia, 146: 641-651.
Mata-González, R., Figueroa-Sandoval, B., Clemente, F., Manzano, M., 2007. Vegetation changes after livestock grazing exclusion and shrub control in the southern Chihuahuan Desert. Western North American Naturalist, 67:63–70.
Mesdaghi, M., 2015. Management of Iran's range lands, Imam Reza University Publication, Mashad, Iran, 333 pp. (In Persian).
Mofidi, M., Jafari, M., Tavili, A., Rashtbari, M., Alijanpour, A., 2013. Grazing exclusion effect on soil and vegetation properties in Imam Kandi Rangelands, Iran. Arid Land Research and Management. 27: 32–40.
Moghaddam, M. R., 2014. Range and Range management, Tehran University Publication, Tehran, Iran, 484pp. (In Persian).
Moradi, E., Mofidi, M., 2012. Effects of grazing exclosure on vegetation in semi steppe rangelands of Semirom Esfahan (Case study: Hana). Rangeland, 6: 272 - 281. (In Persian).
O، Connor, T. G., Raux, P. W., 1995. Vegetation changes (1949-71) in a semi- arid، grassy dwarf shrub lands in the karoo، South Africa: Influence of rainfall variability and grazing by sheep, Jour. Applied Ecology, 32: 612- 626.
Rotich, H., Onwonga, R., Mbau, J., Koech, O., 2018. Vegetation Dynamics in Relation to Grazing Management Practices in Semi-Arid Grazing Lands of Makueni County, Kenya. Jour. Rangeland Science. 8(3): 227-239.
Sharp, L. A., Sanders, K., Rimber, N., 1990. Forty years of change in a shadscale stands in Idaho. Rangelands، 12: 313-328.
Sigcha, F., Pallavicini, Y., Camino, M.J. Martínez-Ruiz, C., 2018. Effects of short-term grazing exclusion on vegetation and soil in early succession of a Subhumid Mediterranean reclaimed coal mine. Plant and Soil, 426: 197.
Van der Merwea, H., Du Toitc, J. C. O., Van den Bergc, L., O'Connora, T. G., 2016. Impact of sheep grazing intensity on vegetation at the Arid Karoo Stocking Rate Trial after 27 years, Carnarvon, South Africa Jour. Arid Environments, https://doi.org/10.1016/j.jaridenv.2018.02.005.
Yan, Y., Lu, X. Y., 2015. Is grazing exclusion effective in restoring vegetation in degraded alpine grasslands in Tibet, China? Peer journal, 3.
Yazd Province Meteorological Administration, 2014. Annual Data of Gariz and Nir Meteoro-logical Station. (In Persian).
Yorks, T. P., West, N. E., Capels, K. M., 1992. Vegetation differences in desert shrub lands of western Utah, spine valley between 1933 and 1989. Jour. Range Management, 45: 569-577.
Zhou, H., Tang, Y., Zhao, X., Zhou, L., 2006. Long-Term Grazing Alters Species Composition and Biomass of a Shrub Meadow on the Qinghai -Tibet Plateau. Pakistan Jour. botany, 38(4): 1055-1069.
Zarekia, S., Arzani, H., Jafari, M., Javadi, S.A., Jafari, A.A., and Zandi Esfahan, E., 2013. Changes of vegetation structure and biomass in response to the livestock grazing in steppe rangelands in Iran. The Journal of Animal and Plant Science, 23(5), 1466-1472.
