Hasan Barati; ali Tavili; hosein Arzani; farhang Ghasriani
Volume 22, Issue 3 , November 2015, , Pages 436-446
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.
Mojgan Azimi; Maryam Bakhshandeh; Abass Ali Sanadgol; Mortezah Akbarzadeh; Farhang Ghasriani; Farhang Jafari
Volume 19, Issue 2 , September 2012, , Pages 321-332
Abstract
In range management, appropriate time for utilization is set based upon plant life stages. Accordingly, phenology of Stipa hohenackeriana was studied in three research sites of Roudshor, Hasaan Abad and Khojir. This study was performed during three growth stages in 3 years. Twenty ...
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In range management, appropriate time for utilization is set based upon plant life stages. Accordingly, phenology of Stipa hohenackeriana was studied in three research sites of Roudshor, Hasaan Abad and Khojir. This study was performed during three growth stages in 3 years. Twenty species were selected and was regularly visited from mid-March 2005. Vegetative, flowering, seeding and winter dormancy were considered as phonological stages. Collected data were interpreted using climatic data (temperature and precipitation) and for each stage, growth degree days were calculated. Results showed that start and end of growth differed in different years and these changes were affected by climatic conditions especially temperature and soil moisture. St.ho had a longer growth period in cool and humid years compared to warm and dry years. But required cumulative temperatures were almost the same in different years. Results indicated that plant growth was affected by growth degree days (GDD) and cumulative rainfall during growth season. Also, the analysis of variance showed that differences in plant height at different sites and also in different years were statistically significant (P<0.05).
Nabi Ahsani; Jafar Oladi; Farhang Ghasriani; Mohammad Darvish
Volume 14, Issue 4 , February 2008, , Pages 539-558
Abstract
Kusalan range is a northwest-southeast mountain near Sarvabad, west of Kurdistan. The habitat includes a complex set of ecological functions and unique mountainous values such as Quercus forests, dense ranges, as well as various springs inside and around the region. So far, there was no study on the ...
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Kusalan range is a northwest-southeast mountain near Sarvabad, west of Kurdistan. The habitat includes a complex set of ecological functions and unique mountainous values such as Quercus forests, dense ranges, as well as various springs inside and around the region. So far, there was no study on the bioenvironmental habitat potential. This persuaded us to conduct a research on the habitat and ecosocial potentials according to IUCN categories using data bases like other literatures, 10 m2 panchromatic SPOT5 2005 data , expert opinions and field studies. Analysis of ecosocial and ecological bioenvironmental sources was implemented through a geographic information system (R2V, Arc/Info, Idrisi and Arc View). After qualitative and quantitative evaluation of various sources, land units were observed from overlaying maps of land form, soil categories, vegetation type, wildlife habitats, land use and conventional territory. Illustrated map show that about 70 percent of the area has a great conservational potential thus, the zonation process on the basis of IUCN definitions executed. The studied area was a habitat for 224 species of flora and 195 species of fauna classified as 5 categories: 29% core zone, 41% buffer zone, 14%expanded recreation zone, 3% intensive recreation zone and 14% cultural historical zone of Hawraman city and Pir-Shaliar annual ceremony and 13.2% reclamation zone including scientific, training values, virgin features and unique landscapes. Thus, Kusalan habitat worth to be introduced a national park (II) as a member of quadruplet national protected area in Iran. According to the results, GIS and RS approaches (hybrid interpretation of high resolution SPOT5 images) certainly can support determining and preparing bioenvironmental map sources in impracticable areas for conservational studies on IUCN criteria basis.
Farhang Ghasriani; Bayazid Yusefi
Volume 13, Issue 4 , February 2007, , Pages 394-401
Abstract
Annual medics which have rapid growth rate, high forage yielding, various growing habits, form a tick growing cover which reduces run-off, soil erosion and increase soil moisture and soil fertility, therefore it may replace the wheat-fallow system. This study was conducted to achieve this purpose in ...
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Annual medics which have rapid growth rate, high forage yielding, various growing habits, form a tick growing cover which reduces run-off, soil erosion and increase soil moisture and soil fertility, therefore it may replace the wheat-fallow system. This study was conducted to achieve this purpose in Sanandaj Research Station of Kurdestan province at the altitude of 1340 m with average precipitation of 462 mm. A randomized complete block design with four replications and five different seed rates of 6, 8, 10, 12 and 14 kg/ha for Medicago rigidula were applied in two years. The data were collected and analyzed for forage yield of different rates. The results of combined analyses showed that increasing one kilogram seeds resulted in 67.5 kg/ha increase of forage production, we suggested that using 14 kg/ha seeds of Medicago rigidula is preferable.