maasoumeh movaghari; Leila Khalasi; Amin Zoratipoor; fereshteh yazdanpanah
Abstract
This study was carried out around Zooir oil well in Khouzestan to investigate the concentration of heavy metals (Pb, Cu, Zn, Cd) in soil and two species of plants (Alhagi camelorum and Cornulaca monacantha), two directions of dominant wind and opposite direction of dominant wind and three distances from ...
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This study was carried out around Zooir oil well in Khouzestan to investigate the concentration of heavy metals (Pb, Cu, Zn, Cd) in soil and two species of plants (Alhagi camelorum and Cornulaca monacantha), two directions of dominant wind and opposite direction of dominant wind and three distances from oil well. The results showed that the concentration of lead, copper and zinc of soil in the wind direction was significantly higher than the opposite wind direction, whereas in the concentration of these elements in the plant, there was no significant effect. This is exactly opposite in the case of cadmium metal. The concentrations of the studied metals in both soil and plants collected from different distances were significantly different at 1% level. The two lead and zinc metals have significant differences in the surface and deep soils, but these were no significant for the cadmium and copper metals as well as in the soils under and between the plants. Heavy metal uptake was no significant effect in the two studied species, but this difference was significant between the shoots and roots. Cadmium and copper have the highest concentration in roots. Lead and zinc have the highest concentration in aerial parts. Evaluation of accumulation and transport factors showed that lead, zinc and cadmium in Cornulaca mocnaantha and lead and zinc in Alhagi camelorum had TF> 1 coefficients, so they could be used to refine soils polluted with these elements. BAC and BCF values for both species were less than one.
Amin Zarratipour; marjan firoozinejad; Khalil Delfan Hasanzadeh
Abstract
Abstract The phenomenon of climate change and global warming and its impact on different ecosystems Needed extensive studies. For this purpose, was done Study of the efficiency of thermal bands and land use changes in determining the surface temperature index using a separate window algorithm in the ...
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Abstract The phenomenon of climate change and global warming and its impact on different ecosystems Needed extensive studies. For this purpose, was done Study of the efficiency of thermal bands and land use changes in determining the surface temperature index using a separate window algorithm in the Bandar-e Emam Khomeyni of Khuzestan province by Landsat 8 satellite imagery. Based on this, was used vegetation index (NDVI) for band ratio between the red and near infrared bands to prepare the LST map and were used four seasonal images in 2016-2017 years. The results of the comparison of the two thermal bands showed that the thermal bond 11 is higher accuracy than the thermal bond 10 (RMSE = 3.6 for the band 11 and RMSE = 4.4 for the band 10) because the wavelength of it is higher. Also, the estimation of the comparison of satellite imagery data with ground truth showed a high accuracy (R2 =0.9). Comparing the temperature of the users was determined that the industrial and urban areas more effective on increasing LST than the vegetation and water areas. Base on bands ratio between near and red infrared bands showed that the vegetation index decreased with increasing temperature. So, the lowest amount of vegetation was estimated in August (-0.42) and the highest was in October (0.35).
sajad neisi; bizhan khalili moghadam; amin zorati pour
Abstract
Gully erosion is one of the aprogressive forms of soil degradation in ranges and agricultural lands which is a warning sign of land degradation and progressive erosion. Monitoring effective factors of gully length development over time is a necessity for sustainable development in watersheds. In this ...
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Gully erosion is one of the aprogressive forms of soil degradation in ranges and agricultural lands which is a warning sign of land degradation and progressive erosion. Monitoring effective factors of gully length development over time is a necessity for sustainable development in watersheds. In this research, the advancement of 30 headcuts were assessed through digital interpretation of multi-temporal aerial photos, photometric methods, field observations and GIS data analysis over two periods of 1964-1993 and 1993-2013, and its contribution to sediment suspended and bed load, using sediment balance model which was carried out on DarbKhazine basin. Moreover, the stepwise regression analysis procedure was applied to extract the effective factors on gully head advancement (such as topography, physio-chemical soil attributes and morphology of gully). The results indicated that the mean of gully head advancement over the periods of 1964-1993, 1993-2013 were measured 0.37, 0.65, respectively which implies on average, 77percent have increased. Further, regression analysis revealed by 9 main factors and R 95%, as themodel indicated among main factors, the Na, EC and organic matter factors with R2 , 0.83 and R , 0.91 leave the most effect on gully head advancement. The gully sediment balance showed that two-thirds and one-third of sediment discharge are formally suspended load and bed load, respectively. This topic is useful as a suitable criterion to distinguish active gullies in order to prioritize conservation activities.
