Sedigheh Zarekia; Naser Baghestani Meybodi; Alibeman Mirjalili; Mohammadreza Ahmadi Roknabadi
Volume 28, Issue 1 , April 2021, , Pages 69-81
Abstract
To investigate the effect of biomechanical methods on increasing the vegetation in arid areas, three regions (Ashkezar, Ghahar, and Chahmatk of Ardakan) in Yazd province were selected. Statistical sites were determined within the scope of rainfall storage operations and outside it (control), and at the ...
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To investigate the effect of biomechanical methods on increasing the vegetation in arid areas, three regions (Ashkezar, Ghahar, and Chahmatk of Ardakan) in Yazd province were selected. Statistical sites were determined within the scope of rainfall storage operations and outside it (control), and at the end of the growing season (May 2018), a survey was conducted. To do this, in each area, 100 plots of 9 square meters (3*3) at a distance of 12 meters from each other and along five transects of 300 meters, which were considered in parallel and at a distance of 100 meters from each other were placed. In each plot, canopy cover percentage and density of different species were measured. Data were compared with a t-test. The results indicate an increase in the canopy within the furrow and crescent. The canopy average in the Ashkezar and Chahmatk of Ardakan rangelands in the rain storage region increased from 2 to 3% compared to the control area. Also, an increase in the density of different species was observed in the precipitation storage area. However, sowing has been done only in the year of rainfall storage. In general, due to vegetation status and plant density by species segregation, performing remedial storage operations along with seeding using Artemisia sieberi and Salsola tomentosa species can be successful for desert rangelands with less than 100 mm of rainfall.
ELHAM fakhimi
Volume 27, Issue 4 , December 2020, , Pages 772-781
Abstract
Mining has increased dramatically in recent years and, destroys natural resources and the environment. This study was carried out to investigate the effect of mining activities on diversity, richness, evenness and structure of vegetation cover in rangelands around copper mine of Dareh Zereshk located ...
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Mining has increased dramatically in recent years and, destroys natural resources and the environment. This study was carried out to investigate the effect of mining activities on diversity, richness, evenness and structure of vegetation cover in rangelands around copper mine of Dareh Zereshk located in Yazd province. Three sampling sites (0-200), (200-500) and (500-1000) meters far from the mine were selected for the study. Then, on each site, 3 transects of 200 m with 50 m apart, Were affected Perpendicular to the slope direction. In each plot, canopy cover percentage and density of plant species of existing species was recorded. The results of variance analysis for different indicators of species diversity, richness and evenness showed that all indicators had significant differences in the three study areas (p <0.05). So that the richness and diversity indices increased with distance from the mine and instead the evenness index was higher near the mine. Also, increasing the distance from the mine significantly increased the percentage of canopy cover of Asteraceae, Fabaceae, Poaceae, Chenopodiaceae and Lamiaceae(p <0.05). In addition, some structure of vegetation cover such as geophyte, chamophyte, hemicryptophyte, shrubs, grasses and perennials were significantly reduced near the mine. In general, the results showed that mining operations had a significant effect on the structure of vegetation in the area and reduced plant diversity. Therefore, it is necessary to pay attention to the pasture damage in the rangeland.
Kazem Dashtakian; Mohammad Khosroshahi
Volume 11, Issue 4 , September 2019, , Pages 383-408
Samira Hosein Jafari; Adel Sepehri; Hosein Soltanlou; Aliakbar Karimian
Volume 25, Issue 4 , February 2019, , Pages 888-897
Abstract
Plant species have different ecotypes. Identification of ecotypes with more yield operation can be useful and commercially profitable. This is the first study to investigate resin yield amount of Ferula pseudalliacea and edaphic conditions of its habitats in desert rangelands ...
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Plant species have different ecotypes. Identification of ecotypes with more yield operation can be useful and commercially profitable. This is the first study to investigate resin yield amount of Ferula pseudalliacea and edaphic conditions of its habitats in desert rangelands of Yazd province. For this purpose, in each region, 20 plants of the same age (5-6 years) were completely randomly selected and used according to the conventional method. Soil sampling was carried out at a depth of 0-30 cm. All data were analyzed using SPSS16 and Excel software. The results showed that bitter asafetida plants had significantly more resin yield in 7, 8, 11 (P<0.05), 9 and 10 cutting times (P<0.01) but less yield in 3 and 13 times in Chenarnaz habitat (P<0.05). The total amount of resin with 63.63 g showed a significant increase in Chenarnaz compared to Borooieh region (60.14) (P<0.01). The most amount of resin yield was observed in 9 and 10 incisions in both habitats. Totally, it is recommended to harvest bitter asafetida during ten cutting times in Yazd province rangelands for sustainable exploitation. Comparison of soil parameters showed that the sand percentage in Borooieh region and the percentages of moisture, silt, organic matter, nitrogen, phosphorus and potassium in Chenarnaz region were significantly higher (P<0.01). Increasing soil moisture storage, organic matter and essential elements of the plant caused resin yield improvement of asafetida in Chenarnaz region. In this study, acidity had a significant increase in Chenarnaz habitat, which is an effective factor in the growth and production rate of asafetida. Chenarnaz region had numerically more lime and better operation of resin yield. According to the results, bitter asafetida plants of Chenarnaz region had better resin yield operation.
Asghar Mosleh Arany; Gholamreza Bakhshi Khaniki; Bibi ozra Hakimi Bafghi
Volume 19, Issue 4 , March 2013, , Pages 581-589
Abstract
Potassium, sodium and free proline play important roles in adaptation of plant species to arid conditions. Distribution of Na+, K+ and free proline in desert plants is not clear. In this study, the accumulation of Na+, K+ and free proline was investigated in three species namely, Stipagrostis pennata, ...
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Potassium, sodium and free proline play important roles in adaptation of plant species to arid conditions. Distribution of Na+, K+ and free proline in desert plants is not clear. In this study, the accumulation of Na+, K+ and free proline was investigated in three species namely, Stipagrostis pennata, Calligonum polygonoides and Hammada salicornia. These species are naturally distributed in Irano-Turanian region. Six plants were selected from each species in the same conditions, in the dry summer of 2010. Soil humidity measurement showed that all plants were in drought conditions. Half of these plants were irrigated. The quantities of Na+, K+ and proline were determined in the roots and stems of all samples. Results showed that the concentrations of free proline in the stem and root of S. pennata were significantly higher than that of other two species and irrigated S. pennata. Furthermore, the concentration of K+ in the stem of H. salicornia was significantly higher than that of other two species and irrigated H. salicornia. Also, the concentration of K+ in the root of H. salicornia was higher than that of other species, but this concentration was not significantly different from the irrigated species. Sodium, like potassium content was higher in H. salicornia, but significant difference was not observed in its quantity between irrigated and unirrigated species. C. polygonoides after H. salicornia accumulated large quantities of Na+ in its stem. Sodium content was higher in the root of H. salicornia and C. polygonoides in comparison with S. pennata. Results also showed that K/Na ratio was less in roots of unirrigated species in all three species, particularly in S. pennata while it was high in stems of S. pennata H. salicornia compared to irrigated species. Consequently, it was concluded that these three species chose different strategies to cope with drought.
Jallal Abdolahi; Hossean Arzani; Mohammad hosein Savaghebi; Mojgan Azimi; Hosein Naderi
Volume 19, Issue 1 , June 2012, , Pages 45-59
Abstract
Our country’s rangelands are mainly located in arid and semi-arid regions. Due to the low amount of precipitation and high rate of evapotranspiration, water stress is considered as the most crucial environmental stress for vegetation in this region. This study was conducted at Khud-e-sofla ...
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Our country’s rangelands are mainly located in arid and semi-arid regions. Due to the low amount of precipitation and high rate of evapotranspiration, water stress is considered as the most crucial environmental stress for vegetation in this region. This study was conducted at Khud-e-sofla rangelands for nine years (1378- 1386) to investigate the effect of precipitation fluctuation on canopy cover and production of important plant species. For this purpose, four dominant species were selected and their canopy cover and production were monitored every year in permanent and random plots, respectively. Precipitation data were collected from the nearest synoptic station. According to the data of precipitation, cumulative rain amount was calculated at various periods. The relationship between variables of plant parameters and cumulative rain amount was analyzed by step wise regression method in SPSS 13. The results showed that plant species often reacted to the precipitation fluctuations. However, various species reacted differently to the precipitation fluctuation in terms of cover and production. The total vegetation cover as well as canopy cover of Artemisia aucheri hada negative and significant correlation with winter precipitation.Whereas, precipitation of January to April and the past year precipitation exhibited a high correlation with canopy cover of Iris songarica and Stipa barbata. The forage production was also influenced by seasonal precipitation. According to the results, total yeild and the yield of Artemisia aucheri, Lactuca orientalis, Stipa barbata could be estimated by precipitation data While, estimation of forage production through the precipitation data was not enough accurate for Iris songarica.
Mohammad Abolghasemiy; Amrali Shahmoradi; Naser Baghestani; Sadegheh Zarekia
Volume 16, Issue 2 , December 2009, , Pages 254-261
Abstract
Recognition of the autecology of plants and understanding their importance in soil protection, as well as forage production for livestock, is a proper strategy for management, conservation, and development of renewable natural resources, specially vegetation. This investigation was carried ...
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Recognition of the autecology of plants and understanding their importance in soil protection, as well as forage production for livestock, is a proper strategy for management, conservation, and development of renewable natural resources, specially vegetation. This investigation was carried out on autecology of Stipagrostis pennata in Yazd province. For this plant, ecological characteristics such as geographic distribution, climatic properties, topography, and soil were studied. Also phenology and root system of the plant were examined. For this purpose , three study sites of Mansoorieh (in Tabas area), Masjed-e-shokr (beside Yazd-Tabas high way), and Bafgh were determined. The results showed that Stipagrostis pennata is a psammophyte plant with standing stems and branches. This plant grows in low-height sand dunes and sandy hills. Elevation range for areas in which this plant grows is 700-1600 meters above sea level. Measure of soil acidity (pH) is 8.25-8.53 and electrical conductivity (EC) is 0.48 to 1.2 ds. This species starts its vegetative growth at the end of February and flowers in early May. Its seeds ripen in mid June. During summer and autumn, the plant is in dormancy stage. Due to high aerial organs, Stipagrostis pennata has a good resistance against sandy storms and winds. So it is highly recommended for mobile sand dune stabilization and control of soil erosion in desert areas. It also produces a fairly good amount of forage for livestock and wildlife.
Mohammad Hadirad; Reza Mir hoseini; Mohammad ali Meshkat; Mahdi Soltani
Volume 15, Issue 1 , January 2008, , Pages 51-58
Abstract
Weighting lysimeters are good instruments and direct method to plants water needs (evapotranspiration) in arid zones. This research practiced at Yazd Shahid-Sadooghi Desert Research Station. Ten galvanized iron lysimeters (120 cm. diameter & 170 cm. high) were made and constructed after covering ...
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Weighting lysimeters are good instruments and direct method to plants water needs (evapotranspiration) in arid zones. This research practiced at Yazd Shahid-Sadooghi Desert Research Station. Ten galvanized iron lysimeters (120 cm. diameter & 170 cm. high) were made and constructed after covering with a glass-wool layer to minimize the effect of the environment temperature variation on them. Four hatchways installed at different depths (30, 60, 90 and 120 cm) of lysimeters for root and soil sampling and estimating of soil moisture content by TDR instrument. These containers became full with disturbed local soil (l.s tex.), planted and irrigated respectively at the beginning. Lysimeters weighted by a portable liftract which was linked to a powerful (5000 kg. capacity) and accurate (0.1 % sensitivity degree) balance. Drainage water also collected from outlet tubes below of lysimeters occasionally. Results has shown that this procedure have had a good efficiency because achieving to objectives of this research was available. Saving and analyzing of information by computer and with change of weighting method, would also be probable in the future.