جستجوی مقالات مرتبط با کلیدواژه "artemisia sieberi" در نشریات گروه "محیط زیست"

Protected areas are vital tools in the management and conservation of both terrestrial and marine environments. However, the conflict between conservation priorities and resource extraction from protected areas is increasing worldwide. Due to its high biodiversity, Mouteh National Park and Wildlife Refuge hold significant conservation value; nevertheless, in recent years, it has been heavily exploited due to rich mineral attractions. Consequently, the current study investigates the Cd concentration in the soil and plants in the Mouteh Basin, its transfer factor, and the influencing factors.

45 soil samples were collected from a depth of 0-30 cm, and leaf samples of the Artemisia sieberi plant were obtained at 15 locations within the plain region of the Mouteh National Park and Wildlife Refuge, which spans an area of 423 km2. The concentrations of Cd in these samples were determined using an atomic absorption spectrometer. The uptake of Cd by the plants was calculated and interpreted using the transfer factor. The Inverse Distance Weighting method in ArcGIS software was used to identify areas contaminated with Cd, with concentrations exceeding 5 mg/kg in soil and 2.0 mg/kg in plant leaves, based on the standard limits set by the WHO and U.S. EPA. Finally, linear, logarithmic, power, exponential and polynomial regression models were employed to examine the impact of road transportation on Cd pollution.

The mean Cd concentrations in plants and soil (mg/kg) were found to be 0.39 ± 0.11 and 2.97 ± 0.15, respectively. The highest soil concentration of this element was recorded in the central areas of the region, reaching 15.00 ± 0.69 mg/kg. This concentration gradually decreased towards the southern parts of the region. The highest concentration of Cd in the leaves of Artemisia sieberi was observed in the northern sections of the region, at 0.62 ± 0.05 mg/kg, while the lowest value was recorded in the central part (0.32 ± 0.05 mg/kg). The transfer factor of Cd ranged from 0.005 to 0.544, with a mean of 0.934. According to the standard limit of 5 mg/kg for Cd in soil, an area equivalent to 20.80% of the region was identified as Cd-contaminated. However, considering the permissible limit of 0.2 mg/kg in plants, a significant portion of the vegetation cover in the area (more than 95%) was found to be contaminated with Cd. The best regression model was achieved in the exponential form with a coefficient of determination of 0.301, indicating that road transportation is one of the most significant human factors contributing to the increase in Cd pollution in the Mouteh soil and plant species Artemisia sieberi.

The exploration of gold and the establishment of multiple mines in the Mouteh region, as well as the construction of highways in the northern province of Isfahan, have led to significant threats to the ecosystem and species of this area. Based on the results, the soils of the Mouteh plain region have been contaminated with Cd. The high concentration of this element in soils near the roads and its decrease with increasing distance from the road are indicators of the impact of road transportation on soil pollution. Therefore, preventing the construction of transportation routes in areas with rich biodiversity, improving the quality of fuels and vehicles, and reducing traffic congestion are among the most important measures for protecting the environment and reducing pollution from potentially toxic elements in natural areas.

This study was conducted in Mohammadabad waste disposal site in Ghazvin in order to determine the concentration of Ni and Pb in Artemisia sieberi and in region’s soil.

Three plots were selected. Ten random samples from root and shoot of the plant and also from the soil were collected. Two-way and one-way ANOVA were used to assess the differences of metal concentrations in roots and shoots of the plants, and in the soil of the plots, respectively. Duncan Test was applied to compare the average concentrations of metals in different plots.

The results revealed that the soil of the different plots does not have a significant difference in Ni and Pb concentrations. No significant difference was observed between the metal concentrations in roots and shoots of the plants. The mean concentration of lead in the A.sieberi aerial and root organs was 2.35 mgkg-1 and 3.19 mgkg-1, respectively, and for the nickel metal 3.14 mgkg-1 and 2.99 mgkg-1 respectively.

Bio concentration and transmission factors for Ni and Pb (TF=0.78; 0.81 and BCF=1.10; 0.33, respectively) suggested that A.sieberi is an appropriate plant to remove Pb from soil.

Allelopathy is known as the interaction effects between plants through the release of chemical compounds, affecting the behavioral patterns of plant communities and their performance. Allelopathic plants, by secreting chemicals, reduce the diversity and frequency of plants underneath the crown as compared to the adjacent open spaces. Receiving less attention so far, allelopathic effects of plants on each other is one of the important concerns in range improvement and reclamation. In this study, the allelopathic properties of Haloxylon aphyllum, as a prominent shrub used in biological reclamation of desert areas and desert margins, and Artemisia sieberi, as a dominant species of steppe rangelands in Iran, were investigated. The review of field observations and review of available scientific literature have been the basis for discussion and conclusion in this regard. According to the results, it is likely that the growth and distribution of other species will not be successful in Haloxylon plantations. On the other hand, the use of Haloxylon shrubs as windbreak or for livestock grazing does not seem to be successful. Because Artemisia sieberi, with its inhibitory effects, may prevent the development of Haloxylon as a companion species in the vegetation composition of steppe rangelands. An explicit commentary on the views presented requires further research in this regard.