ارزیابی توان گیاه‌پالایی کادمیم در بافت‌های مختلف خاک توسط گونه‌های اقاقیا (Robinia pseoudoacacia L.)، زبان‌گنجشک (Fraxinus rotundifolia Miller) و سرو نقره‌ای (Cupressus arizonica Greene)

نوع مقاله: علمی- پژوهشی


1 دانشجوی دکتری جنگل‌شناسی و اکولوژی جنگل، آکادمی ملی علوم ارمنستان، ایروان

2 استادیار، دانشکده منابع طبیعی، دانشگاه تهران

3 استاد، دانشگاه کشاورزی آکادمی ملی علوم ارمنستان، ایروان

4 استادیار، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس


امروزه آلودگی خاک‌ها توسط کادمیوم به نگرانی بزرگی تبدیل شده است. گیاه‌پالایی روشی ساده، اقتصادی و سازگار با محیط زیست برای پالایش محیط‌های آلوده به‌شمار می‌آید. در این تحقیق، اثر بافت خاک (رسی، رسی- لومی و رسی- لومی- شنی) بر انباشت کادمیوم در اندام­های برگ، ساقه، شاخه‌ و ریشه نهال‌های یک‌ساله گونه‌های اقاقیا (Robinia pseoudoacacia L.)، زبان‌گنجشک (Fraxinus rotundifolia Miller) و سرو نقره‌ای (Cupressus arizonica Greene) در قالب طرح فاکتوریل با چهار فاکتور (گونه، اندام، غلظت و بافت خاک) با پایه طرح کاملاً تصادفی مورد مطالعه قرار گرفت. در پایان فصل رویشی میزان تجمع فلز کادمیم در اندام‌های مورد بررسی اندازه‌گیری شد. نتایج نشان داد که بین سه گونه مورد بررسی برای جذب کادمیم در سطح اطمینان 99 درصد اختلاف معنی‌دار وجود داشت. همچنین تفاوت معنی‌داری بین میزان جذب توسط اندام‌های سه گونه در سطح اطمینان 99 درصد مشاهده شد. غلظت‌های 1000، 2000، 3000 و 4000 میلی‌گرم بر کیلوگرم نیز در میزان جذب کادمیم در همین سطح دارای اختلاف معنی‌دار بودند. با توجه به تنظیم بافت خاک مبتنی بر رویشگاه­های اصلی وهمچنین مناطق مناسب کاشت آنها، فاکتور بافت خاک در این مطالعه فاقد اثر معنی‌داری در جذب کادمیم بود. درمجموع، اقاقیا بیشترین میزان جذب نسبت به دو گونه دیگر را به خود اختصاص داد که این امر به‌دلیل ویژگی­های ژنتیکی آن است.


عنوان مقاله [English]

Evaluation of cadmium absorption in different soil textures by black locust (Robinia pseoudoacacia L.), round-leaf ash (Fraxinus rotundifolia Miller) and Arizona cypress (Cupressus arizonica Greene)

نویسندگان [English]

  • Yahya Khodakarami 1
  • Anoushirvan Shirvani 2
  • Jirar Vardanian 3
  • Hormoz Sohrabi 4
1 Ph.D. Student of Forest Ecology, National Academy Sciences of Armenia
2 Assistant Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran
3 Prof., State Agrarian University, National Academy Sciences of Armenia
4 Assistant Prof., Faculty of Natural Resources and Marine Sciences, University of Tarbiat Modares
چکیده [English]

Soil pollution caused by cadmium has recently become a major concern. Phytoremediation is a convenient, cost-effective and eco-friendly method for remediation of polluted environments. In this study, the effect of soil texture (clay, clay-loam and silty- clay- loam) on the cadmium accumulation by leaves, stems, and roots of black locust (Robinia pseoudoacacia L.), round-leaf ash (Fraxinus rotundifolia Miller) and Arizona cypress (Cupressus arizonica Greene) was surveyed. The study was carried out in a complete random-based factorial design with four factors (plant species, plant organs, soil texture and cadmium concentration level). At the end of the growing season, the cadmium concentration in the organs was measured. Analysis of variance showed significant deference (P < 0.01) of cadmium absorption amongst the species. Moreover, the three species showed significantly different absorption rate amongst different organs. In addition, different cadmium concentrations (1000, 2000, 3000 and 4000 mg/kg) applied on the species revealed significantly different absorptions. Soil texture was concluded to have no significant effect on cadmium absorption. Furthermore, R. pseoudoacacia revealed the highest absorption level which was attributed to its genetic specifications.

کلیدواژه‌ها [English]

  • Robinia pseoudoacacia
  • soil texture
  • Fraxinus rotundifolia
  • biofiltration
  • Cupressus arizonica
  • Cadmium
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