جذب و اندوزش سرب و کادمیوم توسط سه گیاه مرتعی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه یاسوج، یاسوج

2 دانشیار گروه علوم خاک دانشگاه ارومیه

3 عضو هیات علمی دانشگاه ارومیه-گروه علوم خاک

4 دانشیار گروه گیاه پزشکی، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه

چکیده

پالایش­سبز فنّاوری نسبتاً جدیدی برای پالایش محیط­های آلوده می­باشد. با این حال، تاکنون گیاهانی کارآمد برای حذف مؤثر سرب و کادمیوم از خاک یافت نشده است. هدف از این مطالعه ارزیابی توانایی ارزن، بیدگیاه و یونجه وحشی در پالایش­سبز سرب و کادمیوم از یک خاک لوم رسی آلوده شده به این فلزات در شرایط گلخانه­ای بود. آزمایش به­صورت فاکتوریل در قالب طرح بلوک­های کامل تصادفی با دو فاکتور فلزات آلاینده سرب و کادمیوم (0 , 150, 400, 800  و1500 میلی­گرم سرب بر کیلوگرم و 0, 5, 20, 60 و100 میلی­گرم کادمیوم بر کیلوگرم) و سه نوع گیاه و در سه تکرار انجام گرفت. نتایج نشان داد با افزایش غلظت سرب در خاک، سرب جذب شده از خاک توسط ارزن و بیدگیاه کاهش و توسط یونجه وحشی افزایش یافت. کادمیوم جذب شده از خاک به وسیله گیاهان مورد مطالعه با افزایش غلظت آن در خاک افزایش یافت. بیشترین میزان سرب و کادمیوم توسط بیدگیاه و کمترین آن توسط ارزن از خاک جذب گردید. ماده خشک بخش هوایی گیاهان مورد مطالعه با افزایش غلظت سرب در خاک کاهش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Absorption and Accumulation of Pb and Cd by Three Pasture Plants

نویسندگان [English]

  • M R 1
  • H KH 2
  • MH RS 3
  • Y RD 4
1 Assis. Prof., Dept. of Soil Sci., Yasouj University, Iran
2 Assoc. Prof., Soil Sci.Dep., Urmia University, Iran
3 Assoc. Prof., Soil Sci.Dep., Urmia University, Iran
4 Assoc. Prof., Dept. Plant Protection, Urmia University, Iran
چکیده [English]

Phytoremediation is a relatively new technique for remediation of contaminated environments. However, until now, no ideal plant has been found for effective remove of lead (Pb) and cadmium (Cd) from soil. The aim of this study was to evaluate the ability of millet (Pennisetum glaucum), couch grass (Triticum repens) and alfalfa (Medicago sativa L.) plants for remediation of Pb and Cd contaminated clay loam soil under greenhouse condition. This experiment was conducted as a factorial experiment based on randomized complete blocks design with two factors of Pb and Cd concentrations (0, 150, 400, 800 and 1500 mg Pb kg-1 and 0, 5, 20, 60 and 100 mg Cd kg-1) and three plants with three replications. Results indicated that Increasing Pb concentration resulted in lesser extraction of Pb by millet and couch grass while alfalfa accumulated higher Pb in its shoots. Uptake of Cd by plants increased as Cd concentration in soil increased. Couch grass and millet showed the maximum and minimum accumulation potential of both Pb and Cd, respectively. Shoot dry mass of the studied plants decreased with increase of Pb concentration in soil.

کلیدواژه‌ها [English]

  • Alfalfa
  • Cadmium
  • Couch grass
  • Lead
  • Millet
  • sorption

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دانش آب و خاک
دوره 27، شماره 2
مرداد 1396
صفحه 131-142

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