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Articles by Hossein Azarnivand
Total Records ( 3 ) for Hossein Azarnivand
  Habib Yazdanshenas , Ali Tavili , Hossein Arzani and Hossein Azarnivand
  Kangar (Gundelia tournefortii) belongs to Rosaceae family that grows in rangeland and is used in many fields. This plant has a variety of minerals and is used in vegetarian dishes. But this plant like as other important plans may be threatened with extinction from over harvesting and should be protected. Therefore, the aim of this study is to identify the traditional use of this plant and survey the modern methods of harvesting that have caused habitat destruction and threatened the health of the plant in Karvan district, west of Isfahan province in Iran. This information has been obtained on the basis of objective observation and questioning local people. Studies indicate that G. tournefortii is grown in this region, even in farm lands and has several uses. Fresh stems and seeds of the plant are used to feed the people and to treat some diseases also. All parts of the plant at the end of growth period are used as the winter forage for livestock. The important thing is that when the plant is used by human, it is not used by animals. Gundelia tournefortii is important to soil and water conservation. But there are natural enemies such as insects and some harvest methods employed by humans have led to a degradation of the habitat of this plant. It is thus necessary to utilize better, environmentally-friendly methods of harvest this important plant. Also this is essential to use modern method to cultivation and propagation this plant, because of the importance and habitat destruction.
  Ali Tavili , Habib Yazdanshenas , Mohammad Jafari , Hossein Azarnivand and Hossein Arzani
  Background and Objective: Changing the plant's architecture root system in the face of environmental stress is one of the most important mechanisms for adaptation of plants and drought stress and salinity are the most important factors that plants should be resistant against them in term of root morphophysiological changes. Therefore, the aim of this research was an assessment of the root morpho-physiological change of the Iranian medicinal endemic Stachys multicaulis under environmental stress. Materials and Methods: Drought treatments included 3 day intervals irrigation periods and a set of salinity (0, 5 and 25 ds m1) were used at a completely randomized design in three different soil textures in pots. Morphological changes of plant's root under stress in three soil texture were studied over the time. Results: Drought and salinity had a distinguish effect on plant root properties based on soil texture. Root length and volume increased along with the increasing the severity of drought in three light, medium and heavy soil textures. But root length and volume decreased along with the increasing the severity of salinity (p<0.05). The plant's root length was 24, 10 and 17 cm, respectively for drought, salinity and control sample in heavy soil. Both salinity and drought stress, also had a positive effect on root density (r2 = 0.56, 0.30 and 0.68 for light, medium and heavy soil textures, respectively under salinity stress). Conclusion: This study indicated that morpho-physiological changes of the S. multicaulis's root under salinity and drought stress is closely dependent on physical properties of the soil.
  Eahsan Shahriary , Hossein Azarnivand , Mohammad Jafary , Mohsen Mohseni Saravi and Mohammad Reza Javadi
  Background and Objective: Interaction among livestock, vegetation and watering point make a piosphere. Intensive grazing can alter the functions of water and soil in rangeland (erosion in the end), changing the rate of flow of energy and the availability of nutrients in ecological systems. The aim of this study was to evaluate indicators of soil surface condition in a steppe piosphere in Shahrood, Iran. Steppe zone Mojen is dominated by Astragalus-Artemisia vegetation type. Methodology: The trigger-transfer-reserve-pulse (TTRP) framework and landscape function analysis were used. All eleven indicators of soil surface processes were visually assessed using a semi-quantitative scale. All eleven indicators were combined to obtain three indices of soil surface condition (stability, infiltration and nutrient cycling). Data analyzed using SAS Proc GLM as one-way analysis of variance (ANOVA) to find the differences. Means were compared using the Scheffé test. Results: Significant differences found among three distances 10, 100 and 1000 m for three soil surface indices infiltration, nutrient cycling and stability. The indices of nutrient cycling, stability and infiltration of Artemisia patches decreased near watering point as 10.58, 34.2 and 16.12%, respectively. Conclusion: Based on this study findings, range managers should rebuild patches and the runoff/runon processes around watering points and maintain the resources and build habitats and biodiversity and reduce harmful effects of piosphere.
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