جستجوی مقالات مرتبط با کلیدواژه « اهواز » در نشریات گروه « جنگلداری »

In this study, the accumulation of heavy metals included iron, manganese, lead, and cadmium in a native species of Christ's thorn jujube (Ziziphus spina-christi) was investigated. To this, random samples were collected from tree leaves and soil at the bottom of the trees from five stations in Khouzestan Oxin Steel Company. Station 1 was located in the company center and adjacent to the source of pollution. Station 2 was situated 100 m away from the company and in the path of wind direction. Stations 3 and 4 were located approximately 200 meters from the source of pollution . Station 5 was placed three kilometers from the company in the opposite direction of the prevailing wind. The results showed that the lowest concentrations of all elements in the leaves of the trees and the soil of the trees were found to be at station 5 and the highest at station 1, therefore, it can be concluded that the distance from the company and the dominant wind direction were effective for this results. The calculation of the bioconcentration factor for four heavy metals showed that the trees were only able to absorb cadmium from the soil with a BCF value of more than one. Considering the usefulness of this tree in fore absorption of cadmium and direct use of fruit and leaves of trees, it is suggested that this tree can be used in areas with cadmium contamination in Khuzestan and areas with similar climate and soil conditions with considering environmental conditions.

Khuzestan is the largest source of internal dust in the country. Ahvaz dust is not a new phenomenon, and what made it to a major environmental problem, is the increase in occurrence of critical conditions due to internal sources of dust. In order to identify the role of the internal recoil center on the creation of critical conditions, daily data on wind direction and wind speed and the minimum horizontal visibility of Ahwaz synoptic station during the 1987-2016 statistical period were extracted, and for the identification of spatial and temporal distribution of the relative contribution of wind speed and wind direction, long-term annual and seasonal wind rose and Golghobar was drawn from the eight primary and secondary directions.. To identify the role of internal and external dust sources, events associated with internal origins, i.e. the sources around the station (Code 07) and outside of the station (Code 06) were maped and their seasonal Golghobar were drawn. Dust events with internal origin overlaid on the layer of internal dust sources and flowing sands. The results showed that the dominant wind direction is west and then North West and general Golghobar follows it. Seasonal Golghobar with external sources comply with general Golghobar but Golghobars with domestic resources change which prevails to South and South East direction in the cold season. Monthly and annual distribution of critical views of the South and South-East were extracted and the results revealed their higher frequency in the cold season. SPI drought index was calculated for the cold season and its relationship with critical views showed demonstrated that their occurrence follows the winter drought. Suitable protective measures should be taken in different parts of the recoil centers, marshes, drylands, grasslands, poor rangelands, etc.