Morteza Abtahi
Volume 26, Issue 3 , September 2019, , Pages 517-530
Abstract
Wind erosion and its consequences, such as dust storms and sand movement is one of the environmental problems in arid regions. There are several ways to combat wind erosion, among which biological reclamation using drought-tolerant species and psammophytes is the most sustainable method. The initial ...
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Wind erosion and its consequences, such as dust storms and sand movement is one of the environmental problems in arid regions. There are several ways to combat wind erosion, among which biological reclamation using drought-tolerant species and psammophytes is the most sustainable method. The initial establishment of these plants requires the use of sand stabilizers such as mulches. The mulch used in the past was the product of oil refineries and industries, which despite its merits such as strength and flexibility, had many environmental consequences. Therefore, researchers and scientists in the country decided to present an eco-friendly product that would replace the oil mulch. One of these products is polymer-cellulosic mulch, produced by the Department of Chemistry, Malek Ashtar University of Isfahan. This mulch was used in sand dunes of Kashan, during which the mulch resistance to environmental conditions, its effect on plant establishment, and soil moisture uptake and retention were investigated. The results showed that this mulch had no negative effect on plant establishment. Its resistance to wind erosion is very good for the first few months of spraying. However, over time and during the hot summer months, cracks appear that partially overshadow the mulch's stabilizing properties. The soil moisture content was about 4.5% higher in 10 t/h mulch as compared with control. In general, for the crust and cracks problems, this mulch cannot be a good alternative to petroleum mulch.
Mojtaba Pakparvar; Morteza Abtahi
Volume 8, Issue 4 , September 2019, , Pages 93-122
Morteza Abtahi; Mohammad Khosroshahi
Volume 12, Issue 3 , August 2019, , Pages 249-262
Mohammad Khosroshahi; Morteza Abtahi; Mohammadtaghi Kashki; Sakine Lotfinasab; Fateme dargahian; Zohre Ebrahimi
Volume 24, Issue 2 , July 2017, , Pages 404-417
Abstract
So far, different statistics have been presented for the area of deserts in the world and Iran by individuals and organizations. The reason for this difference is mainly due to the disagreement among experts in providing a comprehensive definition of desert and factors affecting its formation. In this ...
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So far, different statistics have been presented for the area of deserts in the world and Iran by individuals and organizations. The reason for this difference is mainly due to the disagreement among experts in providing a comprehensive definition of desert and factors affecting its formation. In this paper, the factors of natural environment, such as climate, vegetation, geomorphology, soil, geology and hydrology, whose effects are directly or indirectly involved in the emergence and general appearance of the desert, were investigated. Therefore, to identify and define the desert ranges in terms of the study factors, a number of indicators were defined, based on which desert zones were identified for each factor individually. Then, digital maps were produced by overlaying the layers. Results showed that the largest area of desert regions in Iran with a surface of 693690 and 567711 square kilometers is influenced by climatic and vegetation factors, respectively, and the least area of desert regions with a surface area of 208041 and 272,258 km is affected by the geological and geomorphologic factors, respectively. From the aspect of soil science, the area of desert regions in Iran covers a surface of 514930 km2. The total area of deserts was calculated to be 9007293 square kilometers, which accounts for 55 percent of the total area of Iran.
morteza abtahi; Mohammad khosroshahi
Volume 22, Issue 3 , November 2015, , Pages 492-504
Morteza abtahi
Volume 22, Issue 4 , March 2015, , Pages 639-647
Abstract
This research was aimed to investigate the effect of planting depth and rainwater storage on the establishment of range species including Prangos uloptera- Prangos latiloba-Ferula ovina- Astragalus eriopodus -Onobrychis melanotricha. The study was conducted in autumn using a split plot arrangement in ...
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This research was aimed to investigate the effect of planting depth and rainwater storage on the establishment of range species including Prangos uloptera- Prangos latiloba-Ferula ovina- Astragalus eriopodus -Onobrychis melanotricha. The study was conducted in autumn using a split plot arrangement in a randomized complete block design with three replications. The treatments included rainwater storage and seeding at planting depths of 1 cm, 2.5 cm and 4 cm. The survival percentage was evaluated for the study species at the end of growth stage during three years. Data were analyzed in MSTATC and mean comparisons was performed by Duncan's multiple range test. According to the results, the highest survival percentage under rainwater storage treatment was recorded for P.latiloba at planting depths of 1 cm and 2.5 cm (73%), F.ovina at a planting depth of 1 cm (100%), A.eriopodus at a planting depth of 1 cm (80%), and O.melanotricha at a planting depth of 1 cm (53%). However, the rainwater storage treatment was not effective on P.uloptera and a planting depth of 2.5 cm showed the highest survival (73%).
Morteza Abtahi; Abdollah Seif; Mohammad Khosroshahi
Volume 21, Issue 1 , June 2014, , Pages 1-12
Abstract
Temperature and precipitation are basic constituent components of the climate of a region. For this reason, the assessment of present and future trends of these elements have been considered by different scientists such as natural resources or environmental experts. In this study, Namak lake basin was ...
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Temperature and precipitation are basic constituent components of the climate of a region. For this reason, the assessment of present and future trends of these elements have been considered by different scientists such as natural resources or environmental experts. In this study, Namak lake basin was divided in to six sub-basins and then monthly precipitation and temperature data were collected and reconstructed from 1956 to 2005. Average precipitation, maximum and minimum temperatures of sextuple sub-basins of the lake were calculated using Thiessen method in Arch Map software. In order to evaluate the precipitation trend, Standard Precipitation Index (SPI) was used. The trend of climatic factors (temperature and precipitation) was studied by linear regression and Mann-Kendall test. No significant trend was observed in standardized precipitation of the Namak Lake and in its sub-basins except in the sub-basin of Arak in which the trend of precipitation change was decreasing and significant. According to the study of monthly precipitation, strong droughts have been observed in sub-basins of Arak, Roodshoor and Karaj during the last 50 years. The trends of maximum and minimum temperature change were increasing and significant in most basins. Increasing the temperature of the Namak lake basin may be caused by several factors, including increasing greenhouse gases especially in big cities such as Tehran, Qom, Arak, Kashan, Hamadan, and Qazvin.