Saeed Abdollahzadeh; Marzieh Rezaie; Rasoul Mahdavi
Volume 31, Issue 2 , August 2024, , Pages 204-218
Abstract
IntroductionThe distribution of plants in different habitats is influenced by environmental and edaphic conditions. Identifying the relationship between soil factors and vegetation, as well as the specific soil characteristics in which these species are found, is one of the important goals of this research. ...
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IntroductionThe distribution of plants in different habitats is influenced by environmental and edaphic conditions. Identifying the relationship between soil factors and vegetation, as well as the specific soil characteristics in which these species are found, is one of the important goals of this research. Taking steps in this direction will help prevent habitat destruction and facilitate the restoration of damaged areas. Let me know if you need any further adjustments! Materials and methods The study identified three representative areas using the physiognomic-systematic method, focusing on the habitat of Ferula assafoetida L. Areas with less than 15% coverage were classified as low-density, those with 15-30% coverage as medium-density, and areas with more than 30% coverage as high-density. In each representative area, eight transects of 1000 meters were systematically established and positioned perpendicularly to each other. To account for slope variations in sampling, quadrat sampling along the transects was employed. The plot size was determined using the minimum level method, with species density measured in 2 x 2 square meter plots across a total of 240 plots. To prepare soil samples, two soil profiles were dug at a distance of 500 meters along each transect, resulting in a total of 48 profiles from which soil samples were collected at depths of 0 to 30 cm. In each representative area, three transects of 1000 meters were placed perpendicularly, with ten sampling bases spaced 100 meters apart along each transect. The collected samples were transported to the Water and Soil Laboratory of Hormozgan University for analysis. The amount of gum collected from each base was measured using a digital scale with an accuracy of 0.001 grams. A comparison of the production of this plant gum was conducted across the different habitats. The changes in edaphic factors in representative areas were analyzed using SPSS software with the GLM test, revealing low density at 15.8 bases per hectare, medium density at 27.8 bases per hectare, and high density at 46.9 bases per hectare of Ferula assafoetida L. Results In the areas with low density, the soil acidity level was measured at 7.4, while in the medium-density area, it was 7.8, and in the high-density area, it reached 8. These results indicate that soil acidity is higher in densely populated areas and lower in areas with low density, suggesting that Ferula assafoetida is more compatible with alkaline soils. As soil acidity increases, the density of this plant decreases. The analysis of density changes in relation to organic matter percentage showed that organic matter has a direct effect on plant density; as organic matter increases, so does the density of the plant. Conversely, when the soil has low organic matter content, the density of Ferula assafoetida declines. Additionally, the comparison of average potassium levels revealed that the low-density area had the lowest potassium content, while the high-density area had the highest. The combined levels of calcium and magnesium were also lowest in the low-density area and highest in the dense Angozeh habitat. Furthermore, the number of Ferula assafoetida bases per unit area increased in regions with higher sand content, whereas the number of bases decreased in clay soils. This plant is not compatible with saline or acidic soils. ConclusionUnderstanding the ecological needs and performance of plant species is essential for implementing remedial activities in dry and desert ecosystems. Bestak city, located in Hormozgan province, is home to numerous Anghuzeh plantations, which have the potential to produce gum, generate currency, and provide significant economic value for local communities. The region is characterized by elevations ranging from 1900 to 2500 meters. This species exhibits a greater geographical distribution in areas with sand, silt, and high acidity, with increased density and decreased distribution in clay-rich areas. According to the findings, it appears that this plant thrives in light soils.
mohammad ekrami; rasool mahdavi; mazieh rezaei; hassan vagharfard; Jalal Barkhordari
Volume 27, Issue 3 , October 2020, , Pages 577-595
Abstract
Drought can reduce the sustainable production of natural ecosystems, including rangelands. The main purpose of this study was to expand the vulnerability of rangelands drought in the Pishkuh watershed in Yazd province. In the present study, geographical information systems ...
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Drought can reduce the sustainable production of natural ecosystems, including rangelands. The main purpose of this study was to expand the vulnerability of rangelands drought in the Pishkuh watershed in Yazd province. In the present study, geographical information systems and multi-criteria decision-making method (AHP) were used. In this regard, the parameters affecting the drought vulnerability of rangelands of the study area, including slope, slope direction, precipitation, soil texture, and evaporation were extracted and converted into information layers with the help of GIS. After weighing the layers in terms of importance in drought vulnerability in the framework of multi-criteria decision making (MCDM), the final combination and drought vulnerability map of the study area was prepared. Also, to control and measure the final map, field studies of the study area were used. Finally, a map of the dominant rangeland vegetation type was prepared and overlapped with the drought vulnerability map of the rangelands of the study area to identify the most resistant and vulnerable rangeland vegetation type. The results showed that the highest weight of the effective parameters in rangeland drought vulnerability was related to the precipitation with a value of 0.54, and the lowest weight was related to the slope with a value of 0.061. Based on the results, the eastern, southeastern, and southern regions of the Pishkuh watershed have the highest rate of rangelands drought vulnerability, and Ar.au-St.ba.Sc.or type is the most vulnerable vegetation type in the study area. It is recommended that more management resources and strategies be implemented in vulnerable rangelands to protect the soil and its vegetation.
Saeed Barkhori; Rasoul Mahdavi; Gholamreza Zehtabian; Hamid Gholami
Volume 25, Issue 2 , August 2018, , Pages 355-365
Abstract
The aim of this study was to investigate the temporal and spatial changes trend of groundwater quality for drinking purposes in Jiroft plain. The role of land use and geological formations in the groundwater quality was also investigated. In this study, the parameters of electrical ...
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The aim of this study was to investigate the temporal and spatial changes trend of groundwater quality for drinking purposes in Jiroft plain. The role of land use and geological formations in the groundwater quality was also investigated. In this study, the parameters of electrical conductivity, sodium adsorption ratio, pH, calcium, chlorine, magnesium, sodium, and sulfate were used and the zoning of qualitative data was done by the geostatistical method of Kriging in ArcGIS9.3 software; then, the classification of the region was done using Schoeller diagram. Results showed that in 2001, southern parts of the study area had a lower quality of groundwater but in 2014, northern parts had a lower quality. According to the results, the groundwater quality decreased overtime and the decreasing trend spread from the south to the center and the north of the region. Also, the land use map showed a low quality of groundwater in agricultural lands. The geology map showed a low quality of groundwater in central and southern parts. In general, it can be concluded that the water quality of the study area for drinking is decreased over time and influenced by land use and geological formations; thus, to improve the quality of groundwater resources the role of human factors (land use and agricultural activities) need be taken into account.
rasoul mahdavi; azam ali eivazi dokhtak; hamid gholami; Alireza kamali
Volume 24, Issue 3 , October 2017, , Pages 610-622