Kazem Saedi; farhang ghasriani; Ali Ashraf Jafari; mohamad fayaz
Volume 24, Issue 3 , October 2017, , Pages 676-684
ali ehsani; Mohammad fayaz; Hamze Ali Shirmardi; seyd ali hoseini; Kazem saedi; Mohammadreza shooshtari; jamal hasani
Volume 22, Issue 3 , November 2015, , Pages 558-569
Kazem Saedi
Volume 22, Issue 1 , June 2015, , Pages 131-142
Abstract
In this study, samples were collected in several phenological stages (in two growing seasons of 2010 and 2011) to assess the effects of two grazing systems (continuous and short-term) on forage quality of three key range species of Bromus tomentellus, Cephalaria kotschyi and Ferula haussknechtii ...
Read More
In this study, samples were collected in several phenological stages (in two growing seasons of 2010 and 2011) to assess the effects of two grazing systems (continuous and short-term) on forage quality of three key range species of Bromus tomentellus, Cephalaria kotschyi and Ferula haussknechtii in Zardawan ranch, and two species of Bromus tomentellus and Ferula haussknechtii in Baharestan ranch. The grazing systems are short-term and continuous in Zardawan and Baharestan, respectively. The studied traits were dry matter digestibility (DMD), acid detergent fibers (ADF), water-soluble carbohydrates (WSC), ash and crude protein (CP). Near infra-red spectroscopy (NIRS) was used to measure these traits. A combined analysis based on unbalanced completely randomized design was conducted for statistical analysis. Mean comparisons were made by Duncan's multiple range test. Results indicated that for all species, phenological stages affected all studied traits, without any exception, so that the late vegetative growth stage could be recommended as a proper time for livestock entry to the rangeland. In the face of variation sources studied, different species showed different responses. The comparison of species habitats showed that none of forage quality traits of B. tomentellus and F. haussknechtii differed in the two sites studied. The mean of most forage quality traits were similar in the two years. According to the results, short-duration grazing system of the Shagaldari did not affect the measured traits negatively, but continuous heavy grazing caused to decreased forage quality.
seyed akbar javadi; sonia khatibi baneh; hosein arzani; kazem saedi
Volume 22, Issue 4 , March 2015, , Pages 821-829
Abstract
This research was aimed to investigate the soil function indices in an exclosure region in comparison with non-exclosure. Then, using random plots as a control method, vegetation cover, stones and gravel, and litter were measured. Our results showed that the exclosure region (Saral Research Station) ...
Read More
This research was aimed to investigate the soil function indices in an exclosure region in comparison with non-exclosure. Then, using random plots as a control method, vegetation cover, stones and gravel, and litter were measured. Our results showed that the exclosure region (Saral Research Station) had better condition in terms of function indices in comparison with non-exclosure regions, indicating the positive impact of no livestock grazing for a long time. Northern slope of the exclosure region and the southern slope of non-exclosure region were identified as the most stable (60.26) and unstable (52.8) in the study area. The highest infiltration was recorded for the southern slope of the exclosure region (58.7), and the northern slope of the exclosure region had the highest nutrient cycling (45.63). The western slope of the exclosure region represented the longest inter patch in the whole landscape and the northern slope of exclosure had the largest area and number of ecological patches. Considering the area and number of patches helps the range manager detect the effect of exterior and interior factors on rangeland easier. Overall, long-term exclosure in the Saral region could be mentioned as a suitable method to reduce the runoff, soil erosion, and sediment production.
Kazem Saedi; Adel Sepehri; Mohammad Pesarakli; Hosein Gharedaghi; Reza Azizinejad
Volume 21, Issue 3 , December 2014, , Pages 518-529
Abstract
In most Iranian rangelands, continuous grazing begins with melting snow and continues until the beginning of snow. This study was conducted to evaluate the effects of continuous grazing system on a number of morphological attributes of Bromus tomentellus and Ferula haussknechtii during 2010-2011 in Saral ...
Read More
In most Iranian rangelands, continuous grazing begins with melting snow and continues until the beginning of snow. This study was conducted to evaluate the effects of continuous grazing system on a number of morphological attributes of Bromus tomentellus and Ferula haussknechtii during 2010-2011 in Saral Rangelands of Kurdistan Province. The 30-year exclosure was selected as control area inside the Saral Research Station. In different growth stages, the morphological attributes including the shortest and longest basal area diameter, the shortest and longest canopy diameter, and the height of 10 plants were measured. The annual yield of 30 plants of each species in each year was clipped and weighed to determine forage consumption intensity. All data were subjected to statistical analysis in a completely randomized design using combined analysis. Mean comparisons were performed using Duncan’s Multiple Range Test. Continuous grazing caused to the increase of basal area diameter and canopy diameter of B. tomentellus significantly; however, the height varied in two studied treatments, depending on the year. The three studied morphological attributes of F. haussknekhtii were affected drastically by continuous grazing. In this species, basal area diameter was more affected by the conditions of the year. In both species, ungrazed plants used seasonable rainfall more efficiently as compared to the grazed plants.
kazem Saedi; Hosein Azarnivand; Rohangiz Abbas azimi; Behnam Hamzeh
Volume 15, Issue 4 , January 2009, , Pages 464-474
Abstract
Considering Artemisia-Astragalus as the largest community in Iran, currently, basic studies are conducting on Artemisia spp. properties. Ecological-systematical aspects of anatomical studies of eight populations (six species) of the genus were dealt with in Western Azarbaijan. For removal of ligneous ...
Read More
Considering Artemisia-Astragalus as the largest community in Iran, currently, basic studies are conducting on Artemisia spp. properties. Ecological-systematical aspects of anatomical studies of eight populations (six species) of the genus were dealt with in Western Azarbaijan. For removal of ligneous hardness and tissues maintenance, after a six-month pretreatment of leave, root, stem and epidermis of five bushes per population, hand-cutting slides prepared for observations under a light photomicroscope .Taking photographs and measurings followed coloring different transversal sections or preparing epidermises. Adaptability and xeromorphic aspects of structural characters were studied. To determine the indicators among characters, useful for categorizing species/populations, ANOVA analysis was used in SPSS 11.2. Results were indicatives of the prevalence of ecological conditions on systematical attributes; therefore, nearly all characters were significantly different between populations (even between populations of a certain species). As another important conclusion, stomata density and length were not useful anatomical factors for taxonomic purposes in Artemisia genus, although many researchers laid emphasis on them.