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بررسی قابلیت تجمع فلزات سرب و نیکل در ریشه و برگ اجتماعات دست‌کاشت درختان حرا (Avicennia marina) در بندر امام | ||
| نشریه محیط زیست طبیعی | ||
| مقاله 11، دوره 68، شماره 1، خرداد 1394، صفحه 119-128 اصل مقاله (339.23 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jne.2015.53947 | ||
| نویسندگان | ||
| فرزانه منصوری1؛ افشین دانه کار* 2؛ نعمت الله خراسانی3؛ سهراب اشرفی4 | ||
| 1کارشناسی ارشد، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران | ||
| 2دانشیار، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران و نویسندۀ مسئول | ||
| 3استاد، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران | ||
| 4استادیار، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران | ||
| چکیده | ||
| جنگلهای مانگرو جزء اکوسیستم‌های جنگلی مستقر در اراضی کم‌شیب دانه‌ریز ساحلی گرمسیر و نیمهگرمسیرند. این اکوسیستم به‌دلیل وجود شرایط اکسیداسیون و احیا، آبگرفتگی دورهای توسط جریان جزر و مد و محتویات بالای رس و مواد آلی، نقش مهمی در حذف فلزات و آلایندههای آلی از آب در اکوسیستم‌های ساحلی دارد و میتواند به‌منزلۀ منبعی برای ذخیرۀ فلزات عمل کند. با توجه به توسعۀ مراکز صنعتی در جنوب ایران، به‌منظور بهرهمندی از خدمات این اکوسیستم و نقش این جنگلها در به دام انداختن آلایندهها و حذف آن‌ها از ستون آبی، با بررسی شرایط مورد نیاز برای رشد و توسعۀ این درختان، اقدام به کاشت آن‌ها در برخی مناطق ساحلی جنوب ایران ازجمله بندر امام در دورترین نقطۀ شمالغربی خلیج‌فارس شده است. به‌منظور اندازهگیری فلزات سرب و نیکل در این اکوسیستم، 36 ایستگاه تصادفی انتخاب شد و نمونهبرداری از رسوب، ریشه و برگ این درختان در اردیبهشت 1391 انجام گرفت. نتایج نشان داد میانگین غلظت فلز سرب در رسوب 71/19، در برگ 95/5 و در ریشه 18/1 میکروگرم بر گرم و غلظت فلز نیکل نیز به‌ترتیب 8/77، 92/36 و 94/11 میکروگرم بر گرم است. علاوه بر این همبستگی آماری بالا و درخور توجهی بین فلزات تجمع‌یافته در رسوبات، ریشه و برگ مشاهده شد. یافته‌ها نشان داد میزان انتقال فلز سرب از رسوب به ریشه بیشتر از برگ است به‌طوری‌که میزان انتقال این فلز به ریشه 29/0 برابر رسوبات و در برگ 05/0 برابر رسوبات مشاهده شد. میزان انتقال فلز نیکل نیز به ریشه 74/0 برابر رسوب و در برگ 15/0 رسوب مشاهده شد. | ||
| کلیدواژه‌ها | ||
| بندر امام‌خمینی؛ خلیج‌فارس؛ جنگل مانگرو؛ فلزات سنگین؛ محیط زیست ساحلی | ||
| عنوان مقاله [English] | ||
| An investigation on Accumulation of Lead and Nickel in Roots and Leaves of Planted mangrove Forest (Avicennia marina) in Imam Khomeini Port | ||
| نویسندگان [English] | ||
| Farzaneh Mansouri1؛ afshin danehkar2؛ Nematolah Khorasani3؛ Sohrab Ashrafi4 | ||
| 1Master of Environmental Science, Faculty of Natural resource, University of Tehran | ||
| 2Associate Professor, Faculty of Natural resource, University of Tehran | ||
| 3Professor, Faculty of Natural resource, University of Tehran | ||
| 4Assistant Professor, Faculty of Natural resource, University of Tehran | ||
| چکیده [English] | ||
| Mangrove forests are tropical forest ecosystems located in coastal areas. Because of the redox conditions, periodic flooding, high content of clay and organic matters, Mangroves have an important role to remove heavy metals and organic pollutant from water and adjacent coastal ecosystems, and they often act as sinks for heavy metals. There has been an increase in development trend recently in Southern Iran. The pollution related to these developments has to somehow become under control. One of the ways to deal with such a problem is to benefit from ecosystem services. Mangroves can be a good solution to absorb and collect many pollutants from the water column. In some south coastal areas of Iran, including the local mudflats, these trees have been planted. In order to measure the concentration of Lead and Nickel (two of the most important polluting heavy metals) in mangrove ecosystem, 36 stations were randomly located. In each site, sediments, roots, and leaves of these trees were sampled on May 2012. The results indicated that the mean Lead concentration in the sediment, roots and leaves were 19.7, 5.95 and 1.18 mg/g respectively and the mean Nickel concentrations were 77.8, 36.92 and 11.94 mg/g respectively. There was a significant difference between metal concentration in tissues and sediments (P<0.05). Results depicted that the transition of lead to root tissue is more than leaves. The transition of lead to root tissues was 0.29 times the amount of sediments, and in leaves was 0.05, and transition of Nickel to root tissues was 0.74 of sediments while in leaves was 0.15. | ||
| کلیدواژه‌ها [English] | ||
| Mangrove forest, Heavy metals, Imam Khomeini Port, Persian Gulf, Coastal Environment | ||
| مراجع | ||
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