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Volume 9, Issue 4 , July 2020, , Pages 51-66
Ahmad Ahmadi; Karim Javanshir; Hasan Ahmadi; Valiolah Mozafarian
Volume 10, Issue 2 , September 2019, , Pages 169-192
Ahmad Ahmadi
Volume 10, Issue 4 , August 2019, , Pages 479-489
Mohammad Fayaz; Hooshmand Safari; Hasan Yeganeh; Gholam Hosein Rahmani; Hosein Tavakoli; Mohammad Akbarzadeh; Mohammad Ghaytoori; Ahmad Ahmadi
Volume 21, Issue 4 , March 2015, , Pages 731-746
Abstract
Rangelands are one of the major sources of forage production in the country and in addition to its effects on the production of livestock products, a large population is dependent on rangelands because of animal husbandry. Since the government applies management on rangelands through range management ...
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Rangelands are one of the major sources of forage production in the country and in addition to its effects on the production of livestock products, a large population is dependent on rangelands because of animal husbandry. Since the government applies management on rangelands through range management plans, therefore, in this study, direct and indirect effects of management variables on range condition and trend as well as rangeland production were investigated by selecting three range management plans at three levels of successful, moderately successful and unsuccessful in Kerman, Kermanshah, Mazandaran, Khorasan Razavi and West Azarbaijan provinces. Management variables were included as follows: the accuracy of rangeland and livestock data, project compatibility with natural conditions, beneficiaries' conditions, funding and the capabilities of human resources, predicting the executive and beneficiaries' obligations, executive calendar, and active supervisors. According to the results of rank correlation by Spearman, variables of range condition and trend as well as rangeland production had a high rank correlation together.According to the results of path analysis, variables including the accuracy of rangeland data, project compatibility with the capabilities of human resources, predicting the executive obligations, active supervisors, and beneficiaries' obligations were the factors which improved range condition and trend as well as rangeland production. Due to the negative impact of variables including project compatibility with funding, project compatibility with beneficiaries' conditions, and executive calendar on range condition and trend as well as rangeland production, these variables must be revised and their function need be evaluated. In addition, it is emphasized that greater sensitivity is required in planning for the future due to the negative effect of these variables. Other variables had no favorable or negative effect directly; however, they affected range condition and range trend as well as rangeland production indirectly.
Ahmad Ahmadi; Morteza akbarzadeh; hasan Yeganeh; Maryam Bakhshandeh; Elaheh Ahmadi
Volume 20, Issue 3 , November 2013, , Pages 613-623
Ahmad Ahmadi; Farhang Ghasriani; Mina Bayat; Elahe Ahmadi; Niloofar Zare
Volume 20, Issue 2 , June 2013, , Pages 320-332
Ahmad Ahmadi; AmrAli Shahmoradi; Sedigheh Zarekia; Elahe Ahmadi; Saeedeh Nateghi
Volume 20, Issue 1 , June 2013, , Pages 172-181
Abstract
In this research, Astragalus effusus was considered for autecological study in West Azarbaijan’s catchments. This palatable range species belongs to Papilionaceae. In this study, the ecological characteristics (climatic, topographic, edaphic), distribution in the catchments, phenology, root system, ...
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In this research, Astragalus effusus was considered for autecological study in West Azarbaijan’s catchments. This palatable range species belongs to Papilionaceae. In this study, the ecological characteristics (climatic, topographic, edaphic), distribution in the catchments, phenology, root system, and preference value of Astragalus effuses were investigated. The main part of the study was conducted in study sites of Poldasht (at the elevation of 900 m asl and mean annual rainfall of 120 mm), Shahidan valley (at the elevation of 1700 m asl and mean annual rainfall of 500 mm) and Salmas (at the elevation of 2000 m asl and mean annual rainfall of 338 mm) at different time intervals. The results showed that Astragalus effusus grew in all West Azarbaijan’s catchments from an elevation of approximately 800 to 3575 meters above sea level in all geographic aspects. It grew best on medium-textured soils, from sandy loams to clay loams. Some of the main companion species of Astragalus effusus were Onobrychis cornuta, Bromus tomentellus, Achillea millefolium, and Stachys schetschegleevii. In Salmas study site, the time of initial growth, vegetative growth, flowering, seed ripening and seed dispersion of this species were late March, late April, mid May, mid June and late July, respectively. Astragalus effusus was a tap-rooted species and its roots penetrated to the depths up to 2 meters in sandy loam soils of Salmas region. The geologic studies indicated that the main habitats of the Astragalus effusus were areas with lithologic characteristics of dark gray limestone and red marly limestone with shale in the upper part. This species had no toxic substances and was proper spring forage for livestock.
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.
Mir samad Mousavi; Khadejeh Mahdavi; Ahmad Ahmadi
Volume 18, Issue 3 , September 2011, , Pages 486-497
Abstract
Preservation, regeneration, development and management of renewable natural resources (especially vegetation cover) need precise and comprehensive knowledge. In this research, autecology of Caragana grandiflora sp. was studied in Poldasht, West Azarbayjan province. This species is a perennial plant from ...
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Preservation, regeneration, development and management of renewable natural resources (especially vegetation cover) need precise and comprehensive knowledge. In this research, autecology of Caragana grandiflora sp. was studied in Poldasht, West Azarbayjan province. This species is a perennial plant from Fabaceae family. To study the autecology of this perennial plant species, the habitat was determined by field observations and available reports and then climatic and edaphic characteristics of the habitat, plant root system, phenology, reproduction and food compounds were analyzed. The results showed that the habitat of this species was very limited and scattered throughout the North West of the study area. Mean annual precipitation of the habitat was 312.6 mm and mean annual temperature was 12.8 ċ. This species grows in calcic soils with a sandy texture and a PH of 7.5 to 7.67 and an EC of 7.05 to 1.22 ds m-1. The roots of this species is straight, branched and rhizomic that penetrates up to 1.2 m into soil and spreads out up to 3.2 m when encounters a hard and impervious layer. Study of this plant showed that its canopy cover was from 18.63% to 31.12%. Phenological phenomena begin when it sprouts at late February and continues till middle April in the study area. The flowering period is from May to June. It is full of the fruits from middle June and the seed ripens in July. The Laboratory data was analyzed by SPSS software mean comparison was done by Duncan test. Aboveground organ of the plant contains 21.94, 29.37 and 14.25 crude protein respectively in growth, flowering and seeding periods. This species is recommended for range improvement and reclamation in rangelands which have similar ecological condition to West Azarbayjan.
Ahmad Ahmadian; Abbasali Sanadgol
Volume 14, Issue 1 , January 2007, , Pages 80-87
Abstract
Mountain areas are important sources of livestock forage production, water, energy, and biological diversity. Furthermore, they are sources of such key resources as minerals, forest products and agricultural products and of recreation. Mountain environments are susceptible to accelerated soil erosion, ...
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Mountain areas are important sources of livestock forage production, water, energy, and biological diversity. Furthermore, they are sources of such key resources as minerals, forest products and agricultural products and of recreation. Mountain environments are susceptible to accelerated soil erosion, landslide and rapid loss of habitat and genetic diversity. They are essential to the survival of the global ecosystem. In the West Azarbaijan province of Iran the existed livestock are about two times more than range capacity. Nowadays considering genetic erosion and plant cover retrogression, the study of balanced grazing as an approached strategy for proper management of natural resources is necessary and inevitable. For the study of livestock productions the weights of sheep under balance grazing and traditional grazing were compared with each other. In this study the vegetation type of Festuca ovina -Bromus tomentellus with fair condition, negative trend and grazing capacity of 0.7 animal units in three month was selected. This vegetation type with considering grazing capacity and range readiness was studied under balanced grazing from 1999 to 2003. The results indicated that the range condition promoted from fair condition to good condition, and the grazing capacity reached to 2.7 animal units per month. The average of plant cover and soil protection values reached from 24 and 54 percent to 33 and 64 percent respectively (significant difference at 5 % level of probability)
Ahmad Ahmadi; Abbas ali Sanadgol
Volume 13, Issue 1 , February 2006, , Pages 48-52
Abstract
By considering the plant genetic erosion and plant cover retrogression, the range improvement projects such as pit seeding is essential for increasing the range forage production.The evaluation of Goladam’s rangelands showed that due to heavy and contenious grazing, many palatable species ...
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By considering the plant genetic erosion and plant cover retrogression, the range improvement projects such as pit seeding is essential for increasing the range forage production.The evaluation of Goladam’s rangelands showed that due to heavy and contenious grazing, many palatable species are facing extinction and have been seen with low vigorous and vice versa the unpalatable species had high density and vigorous. In West Azarbaijan province there is about 2321013 animal unit far from rangelands capacity, so applying a treatment that can increse forage production is nesessary. The galehdam station that located in cool semi arid region with 325.8 mm annual rainfall was selected For study the effect of pit- seeding on the range condition and range production .For determining the range condition, range production and range trend, applied the four factors method,clipping method and trend balance method respectively.The study was conducted for 5 years and seeded the Agropyron cristatum, Agropyron desertorum , Agropyron elongatum, Onobrychis sativa و Medicago sativa . The result indicated that the range condition promoted to poor condition from very poor condition, and the forage prodution increased 2 folds. The average plant cover and soil conservation reached to 28 & 86 percent at the end of study and they were significantly difference (p< 0.05).