Mohammad Abolghasemi; Hannaneh Mohammadi Kangarani; Hosein Azarnivand; Mohammadali Emami Meybodi
Volume 28, Issue 1 , April 2021, , Pages 118-128
Abstract
Rangelands are composed of different plant species with different vegetative characteristics that have a certain grazing value. Hence, the grazing livestock also shows a special grazing behavior according to it. Without knowing these behaviors, planning and managing rangelands and livestock ...
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Rangelands are composed of different plant species with different vegetative characteristics that have a certain grazing value. Hence, the grazing livestock also shows a special grazing behavior according to it. Without knowing these behaviors, planning and managing rangelands and livestock is not possible. This research was carried out on camel herds in the rangelands of the Tabas desert from 2015 to 2017. Parameters such as grazing time, rest time, livestock movement time, distance traveled, and livestock movement speed were examined by GPS. The results showed that in spring, summer, fall, and winter, grazing time, livestock movement time, distance traveled, livestock movement speed at (p < /em><0.01), and rest time at (p < /em><0.05) were significantly different. The highest grazing time (342 minutes), rest time (119 minutes), and distance traveled (21.66 km) by camels in the studied rangelands were in summer and the lowest in winter. The highest speed (2.12 km/h) and travel time (359 minutes) were in spring and the lowest in winter. Therefore, knowing the mentioned parameters will help the rangeland management in determining the appropriate time for the camel to move in the rangeland and will increase the livestock performance.
Ali Mirhosseini; Younes Asri; Mohammad Abolghasemi
Volume 27, Issue 2 , June 2020, , Pages 192-203
Abstract
The Bahadoran Kalmand protected area with an area of 255000 hectares is located at about 30 km Yazd township and in the southeastern township of Mehriz with geographical coordinates of 31° 00¢ to 31° 40¢ North latitude and 54° 15¢ to 55° 20¢ East longitude. The ...
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The Bahadoran Kalmand protected area with an area of 255000 hectares is located at about 30 km Yazd township and in the southeastern township of Mehriz with geographical coordinates of 31° 00¢ to 31° 40¢ North latitude and 54° 15¢ to 55° 20¢ East longitude. The vegetation cover was studied using the physiognomic-floristic method. Some soil characteristics were evaluated based on conventional methods and data were analyzed by Principal Component Analysis (PCA) method. The results showed that there was a special relationship between different plant communities and soil characteristics. The most important factors in separating these plant communities were electrical conductivity, acidity, texture, organic carbon, and sodium adsorption ratio. In general, in regard to habitat conditions, each plant community has different ecological needs and tolerance range with environmental factors and soil characteristics.
Mohammad Abolghasemi; Hananeh Mohammadi Kangarani; Hosein Azarnivand; Mohammad Ali Emami Meybodi
Volume 27, Issue 2 , June 2020, , Pages 357-370
Abstract
This study was conducted in the central plateau of Iran to examine the income, cost, and profitability of conventional systems, in which camel is common during the years 2015 to 2017. For this purpose, by selecting 28 conventional systems with an average of 126 camels, the amount of income and cost per ...
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This study was conducted in the central plateau of Iran to examine the income, cost, and profitability of conventional systems, in which camel is common during the years 2015 to 2017. For this purpose, by selecting 28 conventional systems with an average of 126 camels, the amount of income and cost per camel during the regular period of each year (spring) was completed and calculated by the operators with a questionnaire. The type of research is practical, and the statistical population included 28 camel herders. Random sampling was performed. Variables included income factors and camel costs. Using the analysis of engineering economics, the current value of income (PV income) and the present value of costs (PV cost) were calculated for the studied years, and then the net present value (NPV) and the benefit-to-cost ratio (BCR) was calculated with Excel software. The results showed that in all conventional systems, the net present value was positive, and the benefit-to-cost ratio was greater than one (BCR≥1). The highest gross income in each of the conventional systems was related to the sale of live camels (male camels, 6-month-old camels, elimination camels) and the highest cost was related to camel driver’s wages and the purchase of manual forage. However, by calculating gross income from expenses, the amount of profitability was determined, so it is suggested that due to the appropriate profitability of this profession, the relevant agencies have a plan to expand the cultivation of this industry along with the tourism industry and considering that forage of these habitats will not be able to supply the nutritional needs of camels in traditional areas, and the continuation of this situation will endanger the vegetation; therefore, it should be done with caution.
Mohammad taghi Zare; Mohammad Fayaz; sedighe zarekia; Naser Baghestani Meybodi; Mohammad Abolghasemi
Volume 27, Issue 1 , April 2020, , Pages 24-35
Abstract
Rainfall storage with plant species planting is used for rehabilitation and improvement of rangelands, especially in arid areas. In this study the effect of rainfall storage treatments furrow, pitting and crescent pond on the establishment of Ferula tabasensis in Kalmand Bahadoran area of Yazd province ...
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Rainfall storage with plant species planting is used for rehabilitation and improvement of rangelands, especially in arid areas. In this study the effect of rainfall storage treatments furrow, pitting and crescent pond on the establishment of Ferula tabasensis in Kalmand Bahadoran area of Yazd province was evaluated. This area is one of the habitats of the species studied. Seeds were planted at two season, early fall as autumn sowing and late winter as spring sowing. The research was a split plot design, based on randomized complete blocks with three replications. The main plot was planting time (spring and autumn) and sub plot was planting method (farrow, pitting and crescent pond). The seeds were planted in 2013 and 2014. The results showed that seed emergence rate in autumn were significantly higher than spring planting. Among the planting methods, the impact of the crescent pond method was slightly more than the other two methods. In general, planting methods caused more than 50% seed emergence. Although some of these seedlings were destroyed for various reasons, however, the establishment of about 30% of seedlings shows that the methods of rainwater harvesting in the establishment of cultivated plants have had a positive effect.
Kazem Dashtakian; Hamidreza Dashtakian; Mohammad Abolghasemi
Volume 22, Issue 2 , August 2015, , Pages 344-355
Abstract
The source of sandy dunes has been the main question in desert regions. Several theories have been already presented about this question around the world. In addition, several methods have been already invented and applied to find the source of sandy dunes. In this research, the relationship between ...
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The source of sandy dunes has been the main question in desert regions. Several theories have been already presented about this question around the world. In addition, several methods have been already invented and applied to find the source of sandy dunes. In this research, the relationship between playa and sandy area in Yazd province was studied using GIS. At first, the maps of sand dunes and playa in the province as well as neighboring areas were produced. Then, the distance and direction of all sandy polygons to the nearest playa was calculated. Meanwhile, the geographic center of sandy polygons and playa polygons were identified. According to the results, around 60% of sandy polygons had a distance less than 10 kilometers to the playa, and their average distance to the nearest playa was calculated to be 12745 meter. In more than 79% of sandy dunes, the nearest playa was located in the North West. The average angle of playas to the sandy dunes was 332 degree (N), matching with the main windroses and sandroses of province. Therefore, if all sandy dunes and playas are converted to one place, we will have one sandy dune with an average area of 4717 hectares as well as a playa with an average area of 220506 hectares in the northwest of sand dune. Eventually, according to the prevailing wind direction, the hypothesis of the role of playas as the main source of sand dunes in the Yazd province is reinforced.