Salah addin zahedi; Farhang Ghasriani; Mina Bayat
Volume 22, Issue 3 , November 2015, , Pages 481-491
Sedigheh Zare kia; Farhang Ghasriani; Mina Bayat; Hajar Nemati
Volume 22, Issue 2 , August 2015, , Pages 266-274
Abstract
Allowable use is one of the most important factors in determining grazing capacity. The present study was carried out to determine the allowable use of Salsola laricina in Khoshkerood site of Saveh. In this research, four treatments including 25%, 50% ,75% harvesting and no harvesting (control) ...
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Allowable use is one of the most important factors in determining grazing capacity. The present study was carried out to determine the allowable use of Salsola laricina in Khoshkerood site of Saveh. In this research, four treatments including 25%, 50% ,75% harvesting and no harvesting (control) were compared during three years. The results showed that the effect of the year and interaction of different harvesting intensities and year were statistically significant at the level of one percent. In the first year of study, there was no significant difference among treatments; however, in the subsequent years, the effects of treatments were visible. So that the treatments had the most impact on the speciesin the last year. It was clear that there was not significant difference between the 25% harvesting intensity and control treatment. These treatments had the most forage production and also, there was not a significant difference between the other two treatments. The observations showed that the vitality of species in control treatment was less than that of 25% and 50% harvesting intensities, indicating that grazing can increase the plants vitality. Based on the AMMI analysis, the first interaction principal component (IPC1) was significant at the level of 1%, so that 98.2% of the sum of squares of the interaction could be expressed by IPC1. According to the biplot of the IPC1 and mean production, the lowest production rate and stability was recorded for the harvesting intensity of 75%. According to the results, it can be stated thataharvesting intensity of 25% guarantees the survival of S.laricinain this region with no negative effect on the vitality of Salsola laricina.
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.