Esfandiar Jahantab; reza yari; Yaser Ghasemi Aryan; Maryam Saffari Aman; Hadi Moadab
Volume 29, Issue 3 , October 2022, , Pages 161-170
Mohsen Farahi; Morteza Mofidi Chalan; Firoozeh Moghimi Nejad; Rasoul Khatibi; Esfandiar Jahantab
Volume 21, Issue 2 , August 2014, , Pages 307-316
Abstract
In order to management of rangeland ecosystems, understanding its components and the effect of their interactions on each other including soil and vegetation is essential. For this purpose, present study was conducted to investigate the effects of Haloxylon spp and Tamarix spp species on soil properties ...
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In order to management of rangeland ecosystems, understanding its components and the effect of their interactions on each other including soil and vegetation is essential. For this purpose, present study was conducted to investigate the effects of Haloxylon spp and Tamarix spp species on soil properties in Niatak region of Sistan. After identifying the cultivation sites of these species, soil sampling was conducted for each species in representative areas at the end of the growing season based on randomized systematic method. Soil sampling was carried out at beginning and the end of each transects from 0-10 and 10-20 cm soil depths. Soil sampling was also conducted in the control site and then soil properties including pH, EC,N, P, OM, HCO3, Na, Mgand K were measured. All data were analyzed by independent t-test. Results showed that soil properties significantly decreased at both depths excluding acidity. Other soil properties under Haloxylon spp and Tamarix spp species significantly increased compared to control sites. Potassium content at both depths under Haloxylon spp significantly decreased compared to control site. According to the obtained results, a significant increase in soil fertility indices was recorded for Haloxylon spp plantation, while soil destructive properties increased significantly in Tamarix spp plantation. Therefore, although soil properties were improved by the cultivation of bothstudied species, Haloxylon spp is recommended for this region considering more positive effects of this species on soil properties as well as some negative effects of Tamarix spp.
Esfandiar Jahantab; Yaser Ghasemi Aryan; Adel Sepehri; Bahareh Hanafi; Enayat allah Yazdan panah
Volume 19, Issue 3 , December 2012, , Pages 482-489
Abstract
Knowledge of the plant distribution pattern in each region is of principles and fundamentals of vegetation survey and measurement that plays an important role in the selection of management approaches. A study was performed to determine the distribution pattern of three dominant species of Artemisi aaucheri, ...
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Knowledge of the plant distribution pattern in each region is of principles and fundamentals of vegetation survey and measurement that plays an important role in the selection of management approaches. A study was performed to determine the distribution pattern of three dominant species of Artemisi aaucheri, Kelussiao doratissima and Prangos ferulaceae in Dyshmuk region in northwestern Kohgilouyeh and Boyer Ahmad province. One hundred quadrates of 2×2 m were randomly located along six transects of 100-m length and the number of each species was recorded. Using this information, the most appropriate and accurate quadrate-based distribution indices (Green and standard Morisitat indices) were calculated. According to the results, Kelussia odoratissima and Prangos ferulaceae showed a random distribution pattern while distribution pattern of Artemisia aucheri was uniform to random.
Hosein Azarnivand; Yaser Ghasemiaryan; Reza Yari; Mohammad Ali Zare Chahouki; Esfandyar Jahantab
Volume 19, Issue 2 , September 2012, , Pages 297-305
Abstract
The aim of this study was to investigate allelopathic activity of aerial and underground organs of mountain sagebrush (Artemisia aucheri) on seed germination features, root length, shoot length and seed vigor of Festuca ovina.For this purpose, species of mountain sagebrush were collected from Taleghan ...
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The aim of this study was to investigate allelopathic activity of aerial and underground organs of mountain sagebrush (Artemisia aucheri) on seed germination features, root length, shoot length and seed vigor of Festuca ovina.For this purpose, species of mountain sagebrush were collected from Taleghan rangelands in Tehran Province and then were dried in direct sunlight and grinded.Powder derived from aerial and underground organs to the amounts of 3, 6 and 9 grams were separately mixed with 900 grams of sand in completely randomized blocks with four replications. In each pot, 10 seeds were planted at a depth of 2-3 cm. Germination percentage, germination velocity, seed vigor, root length, and shoot length were measured. Data analysis was performed using MSTATC software and mean comparisons were carried out using Duncan's test. Results showed that there were no significant differences among measured factors. Also, the shoot and root lengths showed significant differences at probability levels of 5% and 1%, respectively. According to the results, Artemisia aucheri caused a reduction of root length in Festuca ovina.
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.
Esfandiar Jahantab; Adel Sepehri; Bahareh Hanafi; Zohreh Mirdeilamy
Volume 17, Issue 2 , September 2010, , Pages 292-300
Abstract
The study of plant diversity dynamic on grazed and enclosed rangelands is important in range management. The effect of enclosure was studied on plants diversity dynamics on two range condition sites of Dishmook area in Kohgiluyeh & Buyer Ahmad province. Random-systematic sampling was done in two ...
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The study of plant diversity dynamic on grazed and enclosed rangelands is important in range management. The effect of enclosure was studied on plants diversity dynamics on two range condition sites of Dishmook area in Kohgiluyeh & Buyer Ahmad province. Random-systematic sampling was done in two range sites using 220 (2×2 m2) quadrates along 6 transects with the length of 100 m. Vegetation canopy cover percentage was recorded simultaneously in both range sites. Diversity, richness and evenness were determined by using plant diversity indices (Shannon, Simpson, Berger parker & Mc intash). Results show a higher species richness, evenness and species diversity indices in enclosed rangeland. Statistical T-Student Test showed significant differences between two sites in 5 percent level of probability.