Farhad Aghajanlou; Peyman AKBARZADEH; alireza eftekhari
Volume 31, Issue 4 , January 2025, , Pages 323-333
Abstract
IntroductionIncreasing awareness of the environment and efforts for sustainable management of natural resources require study and monitoring at different timescales and places. Continuous changes should be considered integral to any ecosystem. As natural ecosystems, Rangelands are not exempt from this ...
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IntroductionIncreasing awareness of the environment and efforts for sustainable management of natural resources require study and monitoring at different timescales and places. Continuous changes should be considered integral to any ecosystem. As natural ecosystems, Rangelands are not exempt from this issue. Therefore, Rangeland monitoring is a necessary part of the continuous investigation of these lands, considering their ecological importance, economic function, and potential for permanent changes.Research MethodologyIn order to monitor the trend and intensity of changes in the vegetation cover and soil indicators of the Rangelands over a 5-year period, ground data were evaluated and monitored at dagestan, a site in Zanjan province. The measurement of ground information includes plant and soil factors. Plant factors include the percentage canopy cover of the plant species, the percentage of leaf litter, the density of plant species (in the areas and species that can be investigated), the production of plant species, the condition of the Rangeland, and the tendency of the Rangeland. Evaluation was performed using an appropriate method with sufficient samples and proper distribution in different plant communities during Rangeland preparation and repetition. Soil factors include acidity, electrical conductivity, nitrogen, phosphorus, potassium, organic matter, apparent specific gravity, and soil texture.Results and discussionThe results of the statistical analysis of the measurement of vegetation changes and its effect on soil indicators under the influence of two modes of grazing and flood during a 5-year period were evaluated; The results showed a significant difference between most of the indicators, and in this regard, the amount of total crown coverage and the amount of total production of the Rangeland between the studied years and the type of site were significantly different at the 1% and 5% probability levels, respectively. The highest amount of vegetation cover (56%) was in the grazed area in 2018 and the lowest amount was in the Preserve site (30%) in 1400. The highest total production was at the Preserve site (126 grams per square meter) in 2018, whereas the lowest amount (48.7 grams per square meter) was produced at the preserve Site at 1400. The results of the total species density analysis indicated that there were no significant differences between years and site types, but an interaction was observed between site types and years. However, by comparing the average values of the data, we found that the density of shrubs outside preserveWas higher than that of the grass inside the arq, and the difference was significant. Vegetation under the influence of two types of flooding and grazing can influence some parameters related to soil indicators. The study of the soil in the area under the influence of grazing pressure showed that the increase in the intensity of grazing has caused a decrease in the amount of potassium, phosphorus, nitrogen, organic carbon and electrical conductivity of the soil surface.ConclusionIn general, during the 5-year period, changes in vegetation due to grazing were significant, and the reduction in vegetation had a significant effect on the physical and chemical properties of soil. According to the results, the process of vegetation change in the studied area was slow and was influenced by rangeland management methods. As a result, examining the qualitative and quantitative changes in Rangeland vegetation in certain time intervals and being aware of their conditions is an important part of planning and applying Proper management is the exploitation of rangelands.
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 ...
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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 ...
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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 ...
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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.