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Showing 5 results for Farokhzadeh


Volume 3, Issue 1 (3-2015)
Abstract

Livestock grazing and rangelands fire are important ecological disturbances influencing the vegetation and soil properties in rangelands ecosystem. This study was conducted to determine the effects of different burned treatments and distances from the water sources on some soil and vegetation properties of rangelands ecosystem. The experiment was conducted in Lashgar Dar Rangelands. Vegetation samplings were done based on the randomized systematic method across transects. Fifty randomized quadrats were sampled at each transect. One hundred soil samples per each transect were systematically taken by auger along each transect. The ANOVA and Duncan tests were employed for statistical analyses. The results indicated that the highest and the lowest above-ground biomass production (630 and 117 kg ha-1), Shannon-Wiener diversity index (2.37 and 1.07), soil TOC (18.34 and 6.66 g kg-1), soil gravimetric water content (16.4 and 6 %) and soil porosity (69.43 and 57.74%) values were found in the unburned rangelands with 2000 m distance from the water source and the one year post burned rangelands with 10 m distance from the water source, respectively. Whereas, the maximum and the minimum values of soil bulk density and soil EC were seen in the one year post burn with 10 m distance from the water source and the unburned rangelands with 2000 m distance from the water source, respectively. There were no relations between the soil pH change trends and the different burned treatments or distances from the water source.

Volume 3, Issue 3 (9-2015)
Abstract

Constructionof underground dams is a practical solution to save groundwater in alluvium watersheds, particularly in arid and semi-arid regions where surface water scarcity is an environmental challenge. Considering socio-economic and environmental benefits of underground dams, the accurate locating is the primary consideration for dam construction. The new technologies and methods are a step toward the proper locating to reduce the risk of underground dam construction. In this study, two methods,decision making and geographic information system (GIS) were used for locating suitable places for underground dam construction in Hamedan-Bahar watershed where water shortage has been a serious problem during the last decade. In the first step, the effective factors in locating and construction of the dams underground were identified, and then their GIS information layers were created. The primary selection maps of suitable sites were provided using Boolean logic method in ArcGIS software. The Analytical Hierarchy Process (AHP) was then applied in EXPERT CHOISE. In the next step, the results of Boolean logic and AHP methods were overlapped to provide the final selection map. A consistency rate of 0.06, showed a relatively high accuracy of weighting process. Considering the normal weights, geology and distance of well, springs and qantas were found to be the most and the least effective criteria, respectively. Furthermore, the final selection map suggested the surrounding area and the outlet of the plain as the most suitable sites for dam construction.

Volume 3, Issue 4 (12-2015)
Abstract

Soil alkalinity and salinity are serious problems in arid and semi-arid regions, and therefore monitoring of soil pH and electrical conductivity (EC) is necessary in any region. The present study aimed to properly interpolate soil pH and EC as soil quality indices in a semi-arid mountainous area with annual precipitation of 342.4 mm. The study area is the Karimabad rangelands in Hamadan Province, western Iran. A total of 266 composite soil samples were collected from 0-25 cm soil depth in a systematic random design. Soil samples were processed for pH and EC analysis and then further used for interpolating based on the optimal interpolation method for the study area. The overall soil pH and EC ranged from 7.3-7.9 and 0.33-2.13 dS m-1, respectively, presenting the slightly alkalinity and salinity problem in the region. The results showed the accuracy of spatial prediction of interpolation methods, particularly inverse distance weighting and radius basis function. However, based on root mean square error, the radius basis function was the most appropriate interpolation method to predict spatial distribution of soil pH and EC of topsoil in the study area. While salinity and alkalinity were low, still monitoring these soil indices is highly recommended to prevent the salinization and alkalization in the study area.

Volume 4, Issue 4 (12-2016)
Abstract

The impact of meteorological and hydrological drought on groundwater resources in coastal deserts in the south of Iran was investigated during 1991-2011, using Standardized Precipitation Index (SPI), Standardized Runoff Index (SRI), and Groundwater Resources Index (GRI). The results indicated that wet and drought spells governed the area in the first and second decades, respectively, which was similarly reflected by the three indices; GRI had a good correlation with SPI and SRI in 48-month time scale. This correlation was simultaneously in the eastern and western coasts and with a 6 months delay in the central plains. The findings can help to provide reasonable managerial strategy in relation to water resources management in the coastal plains.

Volume 21, Issue 147 (May 2024)
Abstract

 Date palm seed is a rich source of minerals, fiber, carbohydrates, and contains high levels of antioxidant compounds, making it a cost-effective and beneficial ingredient for formulating food products in the country. The current research was conducted to investigate the  mineral contents in the seeds of 15 cultivated date palm cultivars in Khuzestan province including native cultivars (‘Fersi’, ‘Satmaran’, ‘Zahidi’, ‘Deiri’, ‘Belyani’, ‘Bereim’, ‘Barhee’, ‘Sowaidani’, ‘Asharsi’, ‘Hallawi’, ‘Owaidi’, and ‘Piarom’), and imported cultivars (‘Medjool’, ‘Deglet Noor’, and ‘Thoory’), at the Date Palm and Tropical Fruits Research Center of Iran. These cultivars were analyzed using a completely random design with three replications. The results showed, there are significant differences in the mineral contents, including Fe, Mn, Cu, Zn, Na, K, and Ca in the seeds of different date cultivars. K had the highest content in date palm seeds compared to other elements, followed by Ca, Na, Zn, Fe, Mn, and Cu. The highest levels of Fe and Mn elements were observed in the seed of the ‘Deiri’ cultivar, while the highest levels of Cu and K were found in the seeds of the ‘Medjool’ cultivar. The ‘Deglet Noor’ cultivar had the highest contents of Na and Ca in its seeds. Also, the highest concentration of zinc element was detected in the seed of the ‘Barhee’ cultivar. In different date seeds, the highest positive and significant correlation was observed between Ca% and Na%. Based on the cluster analysis results, regarding seed mineral contents, the examined date palm cultivars were classified into four main groups. Overall, the seeds of examined date palm cultivars, contained significant but highly variable amounts of minerals, and the use of seeds from the ‘Deiri’ and ‘Barhee’ (native cultivars) and ‘Medjool’ (imported cultivar) is recommended as important components in the production of functional food products in the country.
 


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