mohammad javad ahmadi; Younes Asri; Tahereh Eftekhari
Volume 27, Issue 4 , December 2020, , Pages 702-711
Abstract
Diaphanoptera khorasanica is Iran's endemic species and vulnerable threat class. In this research, some of the vegetative and environmental characteristics of this species were studied in the Chalpo-e-Ataeiyeh habitat of Razavi khorassan and Hoindeh and Kajdarreh Sarigoul National Park in North Khorasan, ...
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Diaphanoptera khorasanica is Iran's endemic species and vulnerable threat class. In this research, some of the vegetative and environmental characteristics of this species were studied in the Chalpo-e-Ataeiyeh habitat of Razavi khorassan and Hoindeh and Kajdarreh Sarigoul National Park in North Khorasan, Iran. For sampling of D. khorasanica, 45 plots were arranged in a systematic - random method along 9 transects of 100 m for all three habitats. In each plot, the vegetative properties of this species were measured. In each habitat, three soil samples were randomly taken from the depth of 0-20 cm at the under of the plants, and some of their physical and chemical characteristics were measured. Climatic data of 10 years was extracted from synoptic stations of Kashmar and Esfarayn. After data collection, one way ANOVA was used to analyze vegetative and soil characteristics and Duncan's test was used to compare the means. The results showed that there was a significant difference between the three habitats in terms of crown cover and diameter of the thickest stem at 5% level, plant height and leaf length , density and length of the longest stem at 1% level, but the number of seedling and leaf width were not significantly different. Also, there was a significant difference between the habitats for all of soil characteristics (p < 0.01). The most important environmental factors affecting vegetative characteristics were determined using principal components analysis (PCA). The results showed that minimum absolute temperature, average minimum temperature of coldest month, annual rainfall, electrical conductivity, clay and direction of slope had the most effect on these characteristics, respectively. Also among the vegetative characteristics, length of the longest stem, plant height, crown cover, number of plants and diameter of the thickest stem had the most effect on environmental characteristics.
Ali Mirhosseini; Younes Asri; Mohammad Abolghasemi
Volume 27, Issue 2 , June 2020, , Pages 192-203
Abstract
The Bahadoran Kalmand protected area with an area of 255000 hectares is located at about 30 km Yazd township and in the southeastern township of Mehriz with geographical coordinates of 31° 00¢ to 31° 40¢ North latitude and 54° 15¢ to 55° 20¢ East longitude. The ...
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The Bahadoran Kalmand protected area with an area of 255000 hectares is located at about 30 km Yazd township and in the southeastern township of Mehriz with geographical coordinates of 31° 00¢ to 31° 40¢ North latitude and 54° 15¢ to 55° 20¢ East longitude. The vegetation cover was studied using the physiognomic-floristic method. Some soil characteristics were evaluated based on conventional methods and data were analyzed by Principal Component Analysis (PCA) method. The results showed that there was a special relationship between different plant communities and soil characteristics. The most important factors in separating these plant communities were electrical conductivity, acidity, texture, organic carbon, and sodium adsorption ratio. In general, in regard to habitat conditions, each plant community has different ecological needs and tolerance range with environmental factors and soil characteristics.
Kian Nadjafi-Tireh-Shabankareh; Adel Jalili; Nemat Alah Khorasani; Ziba Jamzad; Younes Asri
Volume 19, Issue 4 , March 2013, , Pages 601-613
Abstract
Genu protected area is located in the north–west of Bandar Abbas and its summit is 2347 meters above sea level. In this study, soil seed bank was investigated in vegetation communities. Soil seed bank plays a role in the revival of vegetation after degradation. In protected areas, understanding ...
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Genu protected area is located in the north–west of Bandar Abbas and its summit is 2347 meters above sea level. In this study, soil seed bank was investigated in vegetation communities. Soil seed bank plays a role in the revival of vegetation after degradation. In protected areas, understanding of the type of soil seed bank in terms of the production capacity of persistent and non-persistent seed bank is valuable to preserve the species especially endemic and rare species. In this study, sampling of the soil seed bank was conducted before precipitation. Sampling points were selected from 50 points in both depths of 0-5 and 5-10 cm of the soil surface to determine soil seed reserves. A total of 135 samples were selected for the study of plant sociology. Trays containing the samples were placed in a greenhouse and were irrigated regularly. In this research, the potential of soil seed reserves was investigated in terms of seed persistence in soil, and according to the results, significant differences were found in terms of seed density per meter square at different depths of soil and the life form of species in different communities. Among life forms, therophytes were more abundant in the soil seed bank while tree and shrub species were scarce. Species with persistent soil seed bank was mainly annuals. From 810 samples of soil seed bank, cultivated in the greenhouse, 3934 seeds were germinated of which 2933 and 1001 seeds were related to the depths of 0-5 and 5-10 cm of soil surface, respectively. In total, the number of seeds was related to 163 species of which 44 species had persistent seed bank. Species in the sampling units of soil seed bank with at least two seeds in the depth of 5-10 cm of the soil surface were considered as species with persistent seed bank. Other species in the region which had non-persistent seed bank were more vulnerable to degradation. In other words, if the vegetation is destroyed, they will not be able to revive.