hosein arzani; Ramezan Zakeri; Javad Motamedi; zahra Arzani; majid Akhshi
Volume 22, Issue 3 , November 2015, , Pages 426-435
hosein arzani; Javad Moetamedi; Firoozeh Moghimi nejad; reza siahmansour
Volume 22, Issue 4 , March 2015, , Pages 607-614
Abstract
In the present study, the forage quality of five range species including Astragalus remotijugus, Hordeum bulbosum, Onobrychis melanotricha, Phlomis persica, and Picris sterigosa were evaluated in 2010. At each phenological stage, three samples and for each sample, at least five species were cut randomly. ...
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In the present study, the forage quality of five range species including Astragalus remotijugus, Hordeum bulbosum, Onobrychis melanotricha, Phlomis persica, and Picris sterigosa were evaluated in 2010. At each phenological stage, three samples and for each sample, at least five species were cut randomly. Then samples were air-dried and grinded. The amount of crude protein (CP) and acid detergent fibers (ADF) was measured in laboratory then dry matter digestibility (DMD) and metabolism energy (ME) was evaluated by the proposed equations.Our results showed that the interaction effect of species and growth stage was significant for the forage quality traits studied (p<0.05) and the forage quality of the species study species varied at different growth stages. The highest amount of crud protein (18.17 %) was related to the vegetative growth stage of Phlomis persica, and the lowest amount was related to the seeding stage of Hordeum bulbosum. The highest level of digestibility (66.44 %) and metabolisable energy (9.30 MJ/KgDM) was measured for the vegetative growth stage of Onobrychis melanotricha, and the lowest amount of digestibility (42.65 %) and metabolisable energy (5.25 MJ/KgDM) was related to the seeding stage of Picris sterigosa. It is concluded that vegetative growth and flowering stages are able to provide the protein requirements and metabolizable energy for the animal unit; however, the final stages of growth is unable to meet the protein requirements, leading to reduced animal performance in the rangeland.. Therefore, the use of supplements in the final stage of growth is recommended for livestock maintenance and the economic efficiency of herd.
Fateme Aliloo; Farshad Keyvan behjou; javad moetamedi
Volume 22, Issue 4 , March 2015, , Pages 625-638
Abstract
The current study was aimed to investigate the relationship between the production of Artemisia aucheri and Agropyron trichophorum and their morphological features and providing regression models. For this purpose, three rangeland sites were selected in Dizaj Batchi and Ghotor Ranglands of Khoy. Stratified ...
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The current study was aimed to investigate the relationship between the production of Artemisia aucheri and Agropyron trichophorum and their morphological features and providing regression models. For this purpose, three rangeland sites were selected in Dizaj Batchi and Ghotor Ranglands of Khoy. Stratified random sampling was used within one square meter plots at 10-m intervals and along 100-m transects. Various regression models including one-dimensional, two-dimensional, and multiple regression models were applied. Among the significant models, the best model was selected at the species level based on model evaluation criteria. The results showed that each of the features investigated had a significant relationship with production. One-dimensional models demonstrated better results and crown diameter (D1) in both species, and all three range sites was chosen as the most efficient morphological feature in order to estimate production. According to the obtained results, suitable models were recommended for the study rangelands and study species.
javad motamedi; saeedeh toupchizadegan
Volume 22, Issue 4 , March 2015, , Pages 787-801
Abstract
This research was aimed to investigate the ecological capability of Hendovan rangelands, located in Khoy, for animal grazing using systemic module in Arc GIS 9.3. Initially, the map of environmental units was integrated with the maps of geology, soil, geomorphology, isohyet, isothermal and water resources, ...
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This research was aimed to investigate the ecological capability of Hendovan rangelands, located in Khoy, for animal grazing using systemic module in Arc GIS 9.3. Initially, the map of environmental units was integrated with the maps of geology, soil, geomorphology, isohyet, isothermal and water resources, and then the characteristics of each homogeneous units were extracted. Finally, given the ecological and environmental characteristics of each homogeneous unit and the criteria of evaluating rangeland capability for livestock grazing in semi-arid areas, the spatial plan for the management of rangelands was provided. According to the obtained results, 25 environmental units were detected at a scale of 1: 25,000 in the region of which large parts have low capability in terms of livestock grazing. In this regard, 8.21% of the land is considered as a protected ecosystem, mainly due to the geological structure especially sharp slope.The results of this study could be used to locate the range improvement programs as well as rangeland classification in terms of range management method. It is suggested that the suitability of each of the classes for livestock and wildlife grazing is determined considering the criteria affecting land suitability.
Esmaeil Sheidaye Karkaj; Javad Motamedi; Kayvan Karimizadeh
Volume 19, Issue 1 , June 2012, , Pages 32-44
Abstract
Suitability of rangeland application in watersheds for optimum use of land is of particular importance which is done with using systemic analysis method. In this method, ecological capability of land is determined for each common land uses. Therefore, in Khanghah Sorkh watershed, homogenous unites ...
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Suitability of rangeland application in watersheds for optimum use of land is of particular importance which is done with using systemic analysis method. In this method, ecological capability of land is determined for each common land uses. Therefore, in Khanghah Sorkh watershed, homogenous unites were determined after identifying the ecological resources and then land capability for rangeland use was assessed in whole watershed. According to the results, 18 ecological homogenous units were distinguished in a scale of 1:25000 as large parts of the lands were devoted to the land use classes of 2-3. Potential and actual ecological land capability of the study area was low for class 1 of rangeland use. In this regard, 24 percent of the land, in terms of geological structure, especially due to the sharp slope, was considered as ecosystem conservation and was offered for wildlife grazing. Meanwhile, 3.8 percent of the rangeland was determined as class1, 11 percent class2, and 19 percent class3. Accordingly, balanced range management and natural range management methods are respectively offered for 3.8 percent (76 ha) of rangelands in the watershed with class 1, and 54.6 percent (1091 ha) with classes 2 and 3. Range improvement practices or artificial range management method is also offered for 41.7 percent (833 ha) of the lands in order to convert inefficient dryland farming to cultivated rangelands.