بررسی قابلیت تجمع فلزات سرب و نیکل در ریشه و برگ اجتماعات دست‌کاشت درختان حرا (Avicennia marina) در بندر امام

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران

2 دانشیار، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران و نویسندۀ مسئول

3 استاد، گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران

4 استادیار، 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


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 Mansouri 1
  • afshin danehkar 2
  • Nematolah Khorasani 3
  • Sohrab Ashrafi 4
1 Master of Environmental Science, Faculty of Natural resource, University of Tehran
2 Associate Professor, Faculty of Natural resource, University of Tehran
3 Professor, Faculty of Natural resource, University of Tehran
4 Assistant 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

 

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