Int. J. Biosci.3( 11), 84-91, November 2013
Current research was performed in selected sites of semi-steppe and mountainous rangelands of Alborz and Zagros. Bromus tomentellus is a key and palatable species which has a considerable portion in rangelands production. For this purpose, 40 similar species of Bromus tomentellus were selected in each site. Selected species were exposed to different harvesting intensities of 25, 50 and 75% and 0% as control group. Data were analyzed by SPSS and MSTATC, and Duncan’s Multiple Range Test was used for mean comparisons. According to the results a significant difference (P<0.01) was found for the production among different years of study in semi-steppe vegetative region. At some sites, further damage was observed as a response to moderate harvesting compared to heavy harvesting. In general, it can be said that rainfall and temperature are considered as the first and second limiting factors for the growth of Bromus tomentellus, respectively. Consequently, a harvesting intensity of 50% was recommended as the best allowable use of Bromus tomentellus in semi-steppe vegetative region and other similar areas. According to the results of harvesting intensities in selected sites of mountainous rangelands of Alborz and Zagros, Bromus tomentellus showed no sensitivity toward different harvesting intensities, and increased rainfall during the growing season was identified as the main factor in increasing forage production. Therefore, a harvesting intensity of 75% was recommended as the best allowable use of Bromus tomentellus for this vegetative region and other similar areas.
Akbarinia A. 2003. Determining the allowable use of Bromus tomentellus in semi-steppe region of Ghazvin province. Iranian Journal of Range and Desert Research 7, 333-345.
Kohandel A, Chaichi M, Arzani H, Mohsenie Saravi M, Zahedi GH. 2005. 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 Resources 59(4), 1001-1011.
Sanadghol A, Moghaddam MR. 2001. The effects of grazing systems and grazing intensities on standing crop and forage intake in Bromus tomentellus pasture. Pajouhesh & Sazandegi 64, 30-35.
Moghaddam MR. 1998. Range and Range Management, University of Tehran 470 p.
Amiri F. 2007. Multipurpose model for rangeland by using GIS (case study: Ghara aghagh Semirom catchment). Ph.D. thesis, Islamic Azad University, Science and Research Branch, Tehran, Iran.
Arzani H. 2009. Range Analysis (M.Sc. Booklet), Faculty of Natural Resources, University of Tehran.
Beetle AA, Johnson WM, Lang RL, May M, Smith DR. 2002. Effect of grazing intensity on cattle weights and vegetation at the Bighorn Experimental Pastures. University of Wyoming, Agricultural Experiment Station Bulletin 373. Laramie, Wyoming.
Cook CW. 1977. Effects of season and intensity of use on desert vegetation. Utah Agricultural Experiment Station, Utah State University, Logan, Utah. Bulletin 483 -Reprinted March 1977.
Ghaemi MT. 2001. Autecology of Atriplex verrucifera in West Azarbaijane Province. Final repor of project. Research Institute of Forests and Rangelands, Iran.
Fazilati A, Hosseini Araghi H. 1965. Country rangelands and management, adjustment and reclamation methods of it, Range engineering office press.
Fulstone F. 2009. Annual operating instruction in Missouri flat allotment for the 2009 grazing season. United States Department of Aagriculture, Forest Services, Humboldt-Toiyabe national forest, file code: 2210.
Ganskopp D. 1988. Defoliation of Thurber needlegrass: herbage and root responses, Journal of Rangemanagement 41(6).
Gasriiani F, Najibzadeh M . 2012 . Study on the allowable use of important range species in Sahand- East Azarbaijane Province, Research Institute of Forests and Rangelands, Iran.
Gasriiani F, Mohebby A, Zandi Esfahan E. 2013. Determination of allowable use for Stipa hohenackerian in semi-steppe rangelands of Iran. Journal of Biodiversity and Environmental Sciences 3(6), 1-7.
Gharedaghi H, Fazel Najafaabadi M. 2000. Seasonal changes in carbohydrate reserves in the key plants of Polour area. The second national range and rangelands management conference,Tehran, 16-18.
Holechek JL, Cole R, Fisher J, Valdez R. 2003. Natural resources, ecology, economic and policy. Rangelands 26, 118-223.
Reece PE, Alexander JD, Johnson JR. 2001. Drought management on range and pastureland, a handbook for Nebraska and South Dakota, Director of Cooperative Extension, University of Nebraska, Institute of Agriculture and Natural Resources.
Smith MV. 2oo7. Effect of stocking rate and grazing management on the persistence and production on dry land on deep sands. Proc. Int. Grassland Cong 9, 624-628.
Smith L, Ruyle G, Maynard J, Barker S. 2007. Principles of obtaining and interpreting utilization data on rangelands, The University of Arizona Cooperative Extension.
Tavakoli H, Hodgson J, Kemp PD. 1993. Responses to defoliation of tall fescue. Proceedings of the XVII International Grassland Congress.
Zhao w, Chen SP, Lin GH. 2007. Compensatory growth responses to clipping defoliation in Leymus chinensis (Poaceae( under nutrient addition and water deficiency conditions. Plant Ecology. http://dx.doi.org/10.1007/s11258-007-9336-3