جستجوی مقالات مرتبط با کلیدواژه « ardebil province » در نشریات گروه « اکولوژی »

Climate change caused by the increase in greenhouse gas concentrations in future periods causes changes in climatic variables and these changes as the biggest dilemma of the 21st century. Therefore, it is necessary to study the future climate change and vulnerability of water resources. In order to predict the effects of climate change on the hydrological status of Ardebil province, the climate variables for the coming decades and under climate scenarios were predicted. The large-scale data gathering was used to simulate and predict the hydrological situation of the study area. Regarding the effects of climate change on the surface flow of the area, it should be noted that although the results from the simulations by the BILAN model indicate unpredictable changes in the total surface flow in the future period. So that the direct surface flow that flows on the groundwater in all scenarios is lower than the base period which is directly related to the decrease in the amount of precipitation in the future and also the increase in the average temperature in the region. In case of groundwater storage in the region, due to the significant decrease in precipitation and also the decrease in the available moisture content of the soil, as well as the increase in temperature, which leads to an increase in the evaporation rate from the soil surface, the area is examined in the upcoming period and under all scenarios show a decreasing trend.

This study was conducted by the aim of study the species composition and diversity in the north faced slopes of Sabalan (altitude profiles of Lahrood-Shabil) along 7 transects in three elevation classes of 1500 to 2000m, 2000 to 2500m and 2500 to 2700m in the grass-shrubland dominated habitats. Plant specimens were collected in the fieldworks, and then species were identified using the checklists and reliable literature. Overall, 64 identified species were belonged to 48 genera and 22 families. Poaceae family with 9 genera and 16 species, Fabaceae family with 4 genera and 8 species and Asteraceae family with 6 genera and 6 species are the dominant family and genera. According to the Rankaier's system hemicryptophytes with 50%, therophytes with 31%, geophytes with 16% and chamaephytes with 3% are the growing life forms at the study area. In terms of geographical distribution, 42% of the species are belong to Iran-Turonian region, 22% of those to Iran-Turonian and Euro-Siberian, 12% are cosmopolitan, 3% to Euro-Siberian and other 21% is belong to other regions. From the identified species 6 of them are in threatened status based on the International :union: for Conservation of Nature and Natural Resources (IUCN) criteria. Diversity and evenness of species were calculated using numerical indices. Results of numerical diversity indices (Simpson and Shannon-Weiner) showed significant change according to elevation. However, the evenness indices (Simpson and Smith and Wilson) show no significant change by elevation.

The aim of this study was to evaluate the condition of the low altitude of the northern rangeland of Sabalan using the soil surface indicators and functional features of rangeland. Using three transects with 50 meters, five structural features 11 soil surface characteristics were measureal. Statistical analysis of data was performed via a landscape functional analysis method. The ANOVA and Tukey test was used to compare the significance of indicators. The results showed that the mean numbers of ecological patches for grass and forb were 57 and 35 respectively. Bare soil patches had the highest average length about 56.23% and then grass with 21.10%. The amount of landscape structure index was 0.31and for the patch area index was 0.01. Comparison of soil surface assessment criteria for different life forms of vegetation and bare soil on the landscape showed that patches with grass life forms had the highest amount of stability and with ecological patches of litter and bare soil had significant differences (P>0.05). Bare soil had the lowest value for stability and from, the statistical point of view showed significant difference (P>0.05) with grass and forb ecological patches. Comparison of soil permeability indices showed that the highest values of permeability index obtained from forb patches and soil patches had the lowest values, and bare soil were statistically significant difference (P>0.05) with other ecological components. Moreover, on the basis of the results of components degradation, which is created under the effect of livestock grazing, it caused the decrease of stability and malfunctioning of the habitat. Therefore, in general the rangelands in low altitude of North Sabalan are degraded, thus it is necessary to act for preventing continues of rangeland degradation and then try to improve and reclaim these rangelands.