Ali Farahani; alireza eftekhari; Hamidreza Mirdavoudi; Gholamreza Goudarzi
Volume 29, Issue 3 , October 2022, , Pages 201-210
Ali Mohebbi; Naser Arabzadeh; Ali Ashraf Jafari; Ehsan Zandi Esfahan; Alireza Eftekhari
Volume 25, Issue 2 , August 2018, , Pages 335-343
Abstract
A large surface area of rangelands in Iran is degraded due to some different factors such as overgrazing, climate-change and so forth. Therefore, an important part of rangelands species is endangered. Rangeland improvement and rehabilitation as well as introducing tolerant species ...
Read More
A large surface area of rangelands in Iran is degraded due to some different factors such as overgrazing, climate-change and so forth. Therefore, an important part of rangelands species is endangered. Rangeland improvement and rehabilitation as well as introducing tolerant species are of utmost importance towards rangeland sustainability. For this, the seeds of different accessions of most important perennial shrubs were collected from the rangelands in Kerman province and cultivated in the research station of Kerman province. A study was conducted in a randomized complete block design with three replications under field conditions, to comparing the germination and establishment of the accessions. Data analysis was performed using SAS software and mean comparisons were made by Duncan's multiple range test. According to the results, Fortuynia bungei showed a better germination and establishment rate as compared with other species. In addition, among the accessions, the highest establishment percentage was recorded for Kouhpayeh (53.03%) and Bam (52%) populations.
Alireza Eftekhari; Hosein Arzani; Ehsan Zandi Esfahan; esmaiel Alizadeh
Volume 23, Issue 2 , September 2016, , Pages 218-209
Abstract
Given the breadth and importance of rangelands in water and soil conservation, fodder production and environmental services and evidence of the destruction of this resource, some measures must be taken to prevent damage and also improve its condition. One of the most important measures is preparation ...
Read More
Given the breadth and importance of rangelands in water and soil conservation, fodder production and environmental services and evidence of the destruction of this resource, some measures must be taken to prevent damage and also improve its condition. One of the most important measures is preparation and implementation of Range Management Plans. Hence, it is necessary to consider implemented projects to know that how much they have contributed in preventing damage and improving rangelands. In this research winter rangelands (with and without Range Management Plans) were investigated in Zarandieh. For this purpose, 16 rangelands with Range Management plan and 14 rangelands without Range Management plan were selected so that all management types (private, collective and different areas of rangeland) were taken into consideration with same climate conditions as far as possible. Consequently all rangelands were selected from Mamoonieh-Zarandieh region with warm and dry weather. After calculating the number of plots (60) and its size (2m2) in each vegetation type, a reference area was selected in which vegetation factors including canopy cover, yield, density, litter, species richness, range condition and trend were evaluated in time of range readiness. Statistical analysis of data was performed by t-test. According to the results, there were significant differences between studied rangelands in most of factors. Overall result of the study showed a better condition for rangelands with Range Management Plans.
leila kashi zenouzi; Shahram Banedj Schafiee; Hosein Saadat
Volume 23, Issue 1 , June 2016, , Pages 150-160
Abstract
This research was aimed to investigate the relationship between the distribution of range species including: Astragaluss microcephalus, Bromus tomentellus, Onobrichis cornuta and some soil physicochemical properties. After overlaying the maps of land-use, slope percentage, and geology, and forming the ...
Read More
This research was aimed to investigate the relationship between the distribution of range species including: Astragaluss microcephalus, Bromus tomentellus, Onobrichis cornuta and some soil physicochemical properties. After overlaying the maps of land-use, slope percentage, and geology, and forming the homogenous land units in the Zilber Chay Watershed, 35 soil samples were taken by stratified random sampling method. Soil physicochemical properties including texture, pH, EC, lime, and organic matter were measured. The soil factors related to each of these range species were obtained by overlaying the maps of range species distribution with land unit maps. First, the relationship between the presence of these range species with soil factors was investigated using logistic regression method. Then, the vegetation density map was prepared using Landsat satellite images and NDVI index for the land units in which the range vegetation type As.mi-Br.to-On.co was found. The values of area density percentage for the vegetation cover related to the range type As.mi-Br.to-On.co were calculated using area density model. According to the results of paired samples test, there was no significance difference among the measured values at 0-15 and 15-45 cm soil depths, except for soil acidity and electrical conductivity. The statistical analysis of the relationship between soil physiochemical properties at 0-15 and 15-45 cm soil depths was performed using multiple linear regression method. The determination coefficient of multiple linear regression model was calculated to be 0.24, 0.31, 0.32, 0.42 and 0.69, respectively, for the vegetation densities of 30, 50, 65, 85 and 100% at 0-15 cm soil depth. In addition, the regression coefficients of soil acidity and electrical conductivity were calculated to be 0.24, 0.31, 0.32, 0.42, and 0.69, respectively, for the vegetation densities of 30, 50, 65, 85, and 100% at 15-45 cm soil depth. This result indicated that the vegetation density of As.mi-Br.to-On.co was affected by the amount of organic matter, pH, and soil texture at 0-15 cm soil depth in the study area.