Investigation of Heavy Metal Contamination in the Ornamental Plants of Green Spaces in the City of Yazd
محورهای موضوعی : مجله گیاهان زینتیMotahareh Esfandiari 1 , Mohammad ali Hakimzadeh Ardakani 2 , Hamid Sodaiezadeh 3
1 - Postdoctoral Researcher in Combat Desertification, Department of Natural Resources and Desert Studies, Yazd University, Yazd, Iran
2 - Associate Professor, Department of Natural Resources and Desert Studies, Yazd University, Yazd, Iran
3 - Associate Professor, Department of Natural Resources and Desert Studies, Yazd University, Yazd, Iran
کلید واژه: Yazd, green space, Heavy metals, <i>Cineraria maritima</i>, <i>Mesembryanthemum cordifolium<i>,
چکیده مقاله :
Due to rapid industrialization and urbanization, environmental pollution has become a significant concern in developing countries; therefore, the main objective of the current study is to determine some of the heavy metal (HM) concentrations in the leaves of dusty miller (Cineraria maritima) and purstane (Mesembryanthemum cordifolium) in different general bus terminal along with the green spaces in the Yazd city. The total concentrations of cadmium (Cd), cobalt (Co), copper (Cu), nickel (Ni), lead (Pb), zinc (Zn), iron (Fe), and manganese (Mn) in the plant samples were measured using atomic absorption spectrophotometry after digestion with acid. All statistical analysis have been conducted, using SPSS 20.0 statistical package. The results showed that the concentration of some HM in the Ghadir passenger terminal and Quran Gate terminal at ornamental plants was higher than the other bus stand. Interaction effects of location and ornamental plants were significant for Mn, Co, Pb, Zn, and Cu metals (P˂ 0.01). According to factor analysis, four factors had the highest variances (Mn, Co, Pb, and Zn). The Pearson correlation analysis between heavy metals found in the ornamental plants showed a lively and, significant correlation between the percentages of Pb with Co and Zn with Mn (P˂ 0.01), with correlation coefficients of 0.88 and 0.62). According to the results, these plants are one of the most resistant ornamental species. Therefore, in dry and semi-arid areas such as Yazd, it is suitable for beautifying green spaces, parks, and urban boulevards and the creating healthier air.
با توجه به رشد سریع صنعت و شهر نشینی، آلودگی محیط زیست به یکی از نگرانی‌های اصلی در کشورهای در حال توسعه تبدیل شده است. بنابراین، هدف اصلی از انجام تحقیق حاضر تعیین غلظت برخی فلزات سنگین (HM) در برگهای گیاهان زینتی گل ناز (Mesembryanthemum cordifolium) و برگ نقره‌ای (Cineraria maritima) موجود در فضای سبز برخی پایانه‌های اتوبوسرانی در سطح شهر یزد می‌باشد. غلظت کل فلزات کادمیوم (Cd) ، کبالت (Co) ، مس (Cu) ، نیکل (Ni) ، سرب (Pb) ، روی (Zn) ، آهن (Fe) و منگنز (Mn) در نمونه های گیاهی با استفاده از روش هضم اسید توسط دستگاه جذب اتمی اندازه گیری شد. تمامی تحلیل‌های آماری با استفاده از نرم افزار SPSS (20) انجام شد. نتایج نشان داد که غلظت برخی فلزات سنگین در پایانه مسافربری غدیر و پایانه دروازه قرآن در گیاهان زینتی بیشتر از سایر پایانه‌ها بود. اثرات متقابل موقعیت مکانی و گیاهان در مورد غلظت فلزات منگنز، سرب، روی، مس و کبالت در سطح یک درصد معنی دار شد (01/0p≤). با توجه به نتابج حاصله از تجزیه و تحلیل عاملی، چهار فلز سرب، کبالت، روی و منگنز بیشترین مقدار واریانس را تبیین کردند. تجزیه و تحلیل همبستگی پیرسون بین فلزات سنگین موجود در گیاهان زینتی نشان داد که بین فلزات سرب و کبالت و روی با منگنز در سطح یک درصد ارتباط معنی‌داری به ترتیب با ضریب همبستگی 88/0 و 62/0 وجود دارد. طبق نتایج بدست آمده این گیاهان یکی از مقاوم ترین گونه‌های زینتی می‌باشند بنابراین، در مناطق خشک و نیمه‌خشکی مانند یزد، برای زیبا سازی فضای سبز، پارکها، بلوارهای شهری و ایجاد هوای سالم مناسب می‌باشند.
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