Behnam Bahrami; Reza Erfanzadeh; Javad Moetamedi
Volume 22, Issue 1 , June 2015, , Pages 47-58
Abstract
Study on the effect of different grazing intensities on some soil characteristics could be helpful in management and conservation of soil and vegetation. In this study, six key areas were selected with different in grazing intensities. The grazing intensities level for Makueian sheep race was recognized ...
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Study on the effect of different grazing intensities on some soil characteristics could be helpful in management and conservation of soil and vegetation. In this study, six key areas were selected with different in grazing intensities. The grazing intensities level for Makueian sheep race was recognized based on the distance to the villageand the cover percentage of invasive, increaser and decreaser species. In each area, soil sampling was done along systematically established transects, in which 18 soil samples were collected from two depths (0-15 and 15-30 cm). Soil samples were then transferred to the laboratory for the chemical and physical analysis of 17 soil characteristics.The results of principle component analysis showed that silt percentage, coarse and fine aggregate percentage, saturation percentage, and particulate organic carbon of upper layer (0-15 cm) as well as soil texture, the carbon of coarse and fine aggregates, EC, and the bulk density of lower layer (15-30 cm) were more sensitive to sheep grazing as compared to other soil characteristics.
Farhang Ghasryani; Mina Bayat; Afsaneh Jabarzare; Mirtaher Ghaemi
Volume 21, Issue 3 , December 2014, , Pages 507-517
Abstract
The calculation of carrying capacity and allowable use of key species is necessary for sustainable range management. Vegetation degradation and soil and water loss can be prevented in the rangeland through calculating the actual carrying capacity. The aim of this research was to evaluate the effects ...
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The calculation of carrying capacity and allowable use of key species is necessary for sustainable range management. Vegetation degradation and soil and water loss can be prevented in the rangeland through calculating the actual carrying capacity. The aim of this research was to evaluate the effects of different harvesting intensities on forage production of Puccinellia distans in saline lands of West Azarbaijan Province. Initially, an area of 0.5 hectare was selected in saline rangelands, located around the Urmia Lake and in the first year of the study excluded from grazing. Forty individuals of the studied species were selected and harvested monthly by clipper at harvesting intensities of 25%, 50%, and 75%. Ultimately, the effects of harvesting intensities on phenological characteristics, forage production, vigor and vitality and mortality of each species were investigated. According to the obtained results, increased harvesting intensity resulted in decreased vitality of the studied species. Our results clearly showed that a harvesting intensity of 50% could be recommended with the least negative effects on plant characteristics and optimal use of forage.
Seyed Akbar Javadi; Shadi Mohamad pori naeem; Hossein Arzani; Ahmad Ahmadi
Volume 19, Issue 4 , March 2013, , Pages 571-580
Abstract
Determination of forage quality of rangeland species is one of the fundamental factors for evaluation of grazing capacity and management of rangelands. In this study, forage quality of Agropyron libanoticum was compared in three phenological stages in Nejh valley, Urmia. After sampling, quality indices ...
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Determination of forage quality of rangeland species is one of the fundamental factors for evaluation of grazing capacity and management of rangelands. In this study, forage quality of Agropyron libanoticum was compared in three phenological stages in Nejh valley, Urmia. After sampling, quality indices such as ADF, CP, ME and DMD were measured in laboratory. Results showed that there were significant differences among the growth stages (at 1 % level of probability). Forage quality of vegetative growth stage was higher than that of flowering and seed ripening stages. Crude protein content decreased from early growth to the end of growth and there was significant difference among vegetative growth stage and flowering as well as seed ripening stage.