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.
Naser Ansari
Volume 8, Issue 4 , September 2019, , Pages 51-69
reza Hasanpouri; Ali Tavili; seyed akbar javadi
Volume 23, Issue 4 , March 2017, , Pages 800-809
Abstract
Identification of effective environmental factors in distribution and establishment of plant species plays an important role in rangeland ecosystems management. The purpose of this study was investigation of reasons for plant species distribution and relationship between index species in Khorramabad ...
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Identification of effective environmental factors in distribution and establishment of plant species plays an important role in rangeland ecosystems management. The purpose of this study was investigation of reasons for plant species distribution and relationship between index species in Khorramabad rangelands and physical and chemical properties of soil. At preliminary inspection, vegetation types were separated and the key area of each type was recognized. Four vegetation types were identified as follows: Agropyron libanoticum-Acantholimon bromifolium ،Hordeum glaucum-Taeniatherum crinitum، Astragalus adscendens-Agropyron trichophorum andAstragalus adscendens-Daphne mucronata. The size and number of sampling plots were calculated to be 4 square meters with minimal area method, and 160 based on the statistical formula, respectively. Sampling method in each vegetation type was randomize-systematic, so that, in each plot, vegetation factors were measured, then at the beginning and end of each transect a profile was dug and some physical and chemical properties of soil were measured. Vegetation ordination was done by CCA method and results showed that organic matter, nitrogen, phosphorus, potassium and pH were the most important factors affecting Daphne mucronata distribution. The distribution of Agropyron libanoticum and Acantholimon bromifolium were affected by potassium, soil texture, and EC. As well, soil texture and lime had a decisive role in distribution of Taeniatherum crinitum, Hordeum glaucum, Astragalus adscendens and Agropyron trichophorum.
Esmaiel Sheydaye Karkaj; Seyedeh Zohreh Mirdeilami; Mousa Akbarlou
Volume 22, Issue 1 , June 2015, , Pages 31-46
Abstract
In this study, in order to take appropriate measures in accordance with the principles of ecological management, the relationship between distribution of ecological species groups of Chahar Bagh summer rangelands with soil factors and various grazing management practices was investigated. Five dominant ...
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In this study, in order to take appropriate measures in accordance with the principles of ecological management, the relationship between distribution of ecological species groups of Chahar Bagh summer rangelands with soil factors and various grazing management practices was investigated. Five dominant vegetation units including reference area (exclosure), key and critical areas (pen, vicinity of village and watering point) were identified in the region, upon the range management and utilization types. Vegetation parameters including density and canopy cover percentage as well as soil properties of two depths were investigated by a random-systematic method. Clustering analysis and principle component analysis were applied to determine the ecological groups of the region as well as the effects of soil physicochemical properties on the distribution of ecological species groups using PC-ORD5 and Canoco 4.0 software. The results led to the separation of five ecological species groups from each other. In this region, the distribution of ecological species groups was affected by soil physicochemical properties (90.48%), management parameters (0.008%), and the interaction effects of these factors (10%). Among the soil physicochemical properties, clay percentage in the first depth (0.999), P content in the second depth (0.991), bulk density (-0.989), porosity (0.985), saturation percentage in the first depth (0.982), and K content in the second depth (0.996) had the highest impact on the distribution of ecological species groups, respectively.
Maliehe Oushib Nataj; Hasan Shekarchi; Maryam Keshavarzi,; Mohammad Akbarzadeh
Volume 18, Issue 1 , May 2011, , Pages 90-106
Abstract
Autecology is the study on behavior and performance of a plant species and its relationship with other living and non living components of a habitat. These kinds of studies provide basic information for management in rangeland ecosystems. In the current research, autecology of Lolium perenne was studied ...
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Autecology is the study on behavior and performance of a plant species and its relationship with other living and non living components of a habitat. These kinds of studies provide basic information for management in rangeland ecosystems. In the current research, autecology of Lolium perenne was studied in Mazandaran province. Geographical distribution, phenology, companion species, dryness index, edaphic and climatic parameters were considered as effective factors on distribution of Lolium perenne. According to the results, the altitude range for the mentioned species was from -22 to 1700 m above sea level. This species is frequently found in different places like road sides, irrigation canals, clay slopes, rocky and sandy hills, and also as a weed in farm fields. Presence percentage in lowlands was also more than that in uplands. Lolium perenne is resistant to cold and harsh conditions and grows mainly in humid to sub humid climates and alpine to Mediterranean and semi-arid habitats. Our results indicatedthat Lolium perenne prefers clay, clay loam, loamy sand, silty clay loam and silty clay soils. These observations show that Lolium perenne can grow in a wide range of ecological conditions.