Javad Motamedi; Esmaeil Sheidai-Karkaj; Yaser Ghasemi Aryan
Volume 30, Issue 1 , April 2023, , Pages 1-23
Abstract
The presentation of management models in the natural area is of great importance due to the large extent and inaccessibility of the whole surface. In this regard, Imam Kandi mountain rangelands were targeted for presenting a spatial-ecological model. Homogeneous ecological units were prepared by incorporating ...
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The presentation of management models in the natural area is of great importance due to the large extent and inaccessibility of the whole surface. In this regard, Imam Kandi mountain rangelands were targeted for presenting a spatial-ecological model. Homogeneous ecological units were prepared by incorporating layers of elevation, slope, geographical orientation and plant types. Considering the ecological and environmental characteristics of each homogeneous ecological unit and considering the criteria and index for evaluating rangeland utilization, we evaluated the power and suitability of using rangelands. According to the range condition and trend of the rangeland, the rangeland method and grazing systems were presented for each of the classes. Based on the results of 23 homogeneous ecological units, it was identified that many of them belong to rangeland lands with grades 1 to 3. Accordingly, equilibrium range management was considered in 26.9% (244.4 ha) of rangelands with good condition and class 1 power. In 37.4% (346.4 hectares) with moderate condition and class 2 power, natural range management was recommended. Artificial range management or range improvement were recommended for 35.7% (329.9 ha) of poor and class 3 land. In order to prevent erosion and increase forage production, artificial range management was recommended for abandoned fields. The results indicate that application of spatial-ecological model and consequently identification of ecological homogeneous zones as management and planning units at macro level as a cost-effective method, in addition to assessing rangelands power, can enable rangeland management in proposing the rangeland method and grazing systems and assist in localization of range improvement operations.
Esfandiar Jahantab; reza yari; Yaser Ghasemi Aryan; Maryam Saffari Aman; Hadi Moadab
Volume 29, Issue 3 , October 2022, , Pages 161-170
Firoozeh Moghiminejad; Ali Tavili; Mohammad Jafari; Mohsen Shirvany; Yaser Ghasemi Aryan
Volume 29, Issue 1 , February 2022, , Pages 11-23
Abstract
The increasing popularity and trade of medicinal plants on the one hand, and the expansion of polluting water, soil and air resources on the other hand, have made the health, safety and quality of medicinal plants raw materials and their processed products a major concern of world organizations. Become ...
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The increasing popularity and trade of medicinal plants on the one hand, and the expansion of polluting water, soil and air resources on the other hand, have made the health, safety and quality of medicinal plants raw materials and their processed products a major concern of world organizations. Become more and more diverse and implement various research projects in this field. The present study aimed to investigate the effect of cadmium heavy metal on the phytochemical properties of licorice in a completely randomized design with cadmium treatment at 6 concentrations (0, 10, 20, 40, 80 and 160 (ppm)) and 4 replications. Potted cultivation (24 pots in total) was performed. After planting substrate and spraying cadmium heavy metal nitrate with above mentioned concentrations, licorice rhizomes were cultured in pots and kept in greenhouse for 7 months. Finally, dried and powdered plant samples (in two sections of aerial parts) were transferred to laboratory for measurement of phytochemical properties. The measured variables in the underground organs were glycyrrhizic acid, glabridine, liquoritin and in the aerial parts of routine and catechin flavonoids. Extraction was performed by ultrasonic and solvent methods. The best solvent for extraction of active substances in aerial and ground organs was determined after ethanol: water (70:30) tests and the measurements were performed by high performance liquid chromatography (HPLC). Comparison of mean cadmium concentrations in the studied concentrations showed that increasing the concentration of this element in soil had a significant effect on glycerolic acid, glabridine and liquoritin levels in groundwater and routine flavonoids and catechins in aerial parts of licorice. In this regard, glyceric acid and liquoritin were the most additive effects at concentration of 10 (ppm), 70.12 and 56.44%, and glabridine at concentration of 20 (ppm) at 51.70%, respectively. It also showed that the amount of active substances in licorice underground increased initially with cadmium treatment and then decreased with increasing concentration of heavy metal.
Firoozeh Moghiminejad; Mohammad Jafari; Mohammad Ali Zare Chahooki; Yaser Ghasemi Arian; Asghar Kohandel
Volume 21, Issue 4 , March 2015, , Pages 643-650
Abstract
Exclosure is the prevention of livestock access to all or part of the rangeland for one year or a few consecutive years, performed with different goals. This research was aimed to investigate the effect of exclosure on soil physical and chemical properties as well as three main elements of N, P, and ...
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Exclosure is the prevention of livestock access to all or part of the rangeland for one year or a few consecutive years, performed with different goals. This research was aimed to investigate the effect of exclosure on soil physical and chemical properties as well as three main elements of N, P, and K in Nazarabad region, Karaj. Soil sampling was performed in both sites of exclosure and grazing. Soil samples were taken from the beginning, middle and end of the four transects, established in each region, at two soil depths of 0-20 cm and 20-80 cm using systematic random sampling. The following soil properties were measured in the lab: pH, EC, organic matter, saturation percentage, and N, P, K. According to the obtained results, the effect of exclosure on soil N, P, and K was significant; however, exclosure had no significant effect on pH, organic matter and saturation percentage. Overall, our results clearly showed the positive impact of exclosure on soil physical and chemical properties.
Yaser Ghasemi Aryan; Hosein Arzani; esmaeel Filekesh
Volume 20, Issue 4 , March 2014, , Pages 634-643
Fatemeh Nour; Masoud Nasri; Hasan Yeganeh; Firoozeh Moghiminejad; Yaser Ghasemi Aryan; Jamal Bani name
Volume 20, Issue 3 , November 2013, , Pages 522-530
Rasool khatibi; Yaser Ghasemi Arian; Esfandyar Jahantab; Mohammad Haji hashemi
Volume 19, Issue 1 , June 2012, , Pages 72-81
Abstract
Soil properties are of the effective factors in distribution of vegetation, especially in arid and semi arid regions as the effect of geology, topography and climatic factors appeare in soil properties. In this study, soil properties of rangeland vegetative types was studied in Dejinak-e-Khash in the ...
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Soil properties are of the effective factors in distribution of vegetation, especially in arid and semi arid regions as the effect of geology, topography and climatic factors appeare in soil properties. In this study, soil properties of rangeland vegetative types was studied in Dejinak-e-Khash in the southern of Taftan. Soil and vegetation sampling were done in key areas of each site by random- systematic method. Plot size was determined with minimal area method. Also, the size and number of transects for sampling were determined according to species and vegetation changes. Physicochemical properties of soil including soil texture, pH, electrical conductivity, lime and organic matter were measured. After measuring soil and plant factors, statistical analysis was performed on plant species, vegetation types and soil factors by SPSS software. Finally, the best equation and correlations were determined between vegetation types and soil parameters. Results showed that the percentage of organic matter, clay and absorbable potassium were the most important factors in distribution of key range species in the study area. In general, the results showed a significant relationship at 95% probability level for Artemisia siberi with potassium and clay, for Salsola nitraria with soil pH, and for Acanthophyllum microcephalum with total nitrogen. Also, the distribution of Hammada salicornia was significantly affected by all factors except P and EC at 95% probability level.
Ebrahim KAzemi; Amrali Shahmoradi; Mohsen Padyab; Ardeshir Shafiee; Yaser Ghasemi Aryan
Volume 17, Issue 4 , November 2011, , Pages 564-574
Abstract
Autecology consederd as study a plant species behaviour and function and also determining its relationship with other biotic and abiotic components includes an important part of ecological studies in natural resources science. In the current research, autecology of Dorema aucheri, ...
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Autecology consederd as study a plant species behaviour and function and also determining its relationship with other biotic and abiotic components includes an important part of ecological studies in natural resources science. In the current research, autecology of Dorema aucheri, a perennial plant from Apiaceae family, was studied in range ecosystems of Kohgiloye and Boyerahmad. First of all vegetation map was provided using 1:50000 topographic maps and all characteristics including topography, climate, soil, and also companion species, root system, phenology, regenerarion, preference value, chemical compounds and frequency were studied. According to the results, Dorema aucheri grows in an elevation range of 1600 to 3400 m above sea level and in semi arid and moderate mediterian climates. The highest density of Dorema aucheri was recorded at 2300 to 3000 m above sea level. Soil texture in the study area was silty clay loam, silty clay, clay, silty loam and loam. Soil EC differed from 0.21 to 0.5 ds/m and a pH range of 7.5 to 8.2 was obtained. Average annual precipitation is 750 mm and temperature differed from -11 to 35 centigrade degree. Vegetative growth starts in early March and ends in early April. Its flowering stage is from mid April to May. Seed ripening stage is in mid July and no autumn growth was recorded. Root spreads in vertical (>200cm) and horizontal (>150cm) dieractions. Despite this plant is not palatable, it is used by livestock in absence of other palatable species. Human also utilizes this species as food or medicinal purposes.