تحمل صنوبر اورامریکن (Populus euramericana 561/41) به غلظت‏های مختلف سرب

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگل‌داری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

2 استاد، گروه جنگل‌داری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

3 استادیار، گروه محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

4 استادیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور،‌ سازمان تحقیقات،‌ آموزش و ترویج کشاورزی

چکیده

در پژوهش پیش‌رو، پتانسیل گیاه‌پالایی کلن 561/41 صنوبر اورامریکن (Populus euramericana Guinier) به خاک آلوده به سرب (غلظت‌های صفر، 500، 1000، 1500 و 2000 میلی‌گرم بر کیلوگرم) در یک مکان مسقف در قالب طرح کامل تصادفی بررسی شد. نتایج نشان داد که در غلظت‌های 500، 1000، 1500 و 2000 میلی‌گرم بر کیلوگرم سرب، زنده‌مانی به‌ترتیب حدود 19/9، 35/8، 55/6 و 60/3 درصد کاهش یافت. این درحالی بود که اعمال غلظت‌های مختلف سرب تغییر محسوسی در کاهش طول ریشه و ارتفاع ساقه ایجاد نکرد و تا غلظت 500 میلی‌گرم بر کیلوگرم سرب، سطح برگ و زی‌توده‌های ریشه،‌ ساقه،‌ برگ و کل نونهال کاهش پیدا نکرد. با افزایش غلظت سرب در خاک، غلظت و مقدار سرب در ریشه، ساقه و برگ افزایش یافت و مقادیر آنها همواره در ریشه بیشتر از ساقه و برگ بود. در غلظت 500 میلی‌گرم بر کیلوگرم سرب، کارآیی انتقال (تجمع سرب در اندام هوایی) و شاخص‏های تحمل ریشه، اندام هوایی و نونهال بیشتر از غلظت‌های دیگر اعمال‌شده سرب بود. به‌طور کلی، نونهال‌های P. euramericana در غلظت 500 میلی‌گرم بر کیلوگرم تحمل بسیار خوبی نسبت به فلز سنگین سرب داشتند و در غلظت‌های بیشتر، اگرچه شاخص تحمل آنها حدود 60 درصد کاهش یافت، اما نشان‌دهنده تحمل قابل قبول این کلن در غلظت‏های زیاد سرب بود. همچنین انباشت قابل ملاحظه سرب در ریشه، نشان‌دهنده عمل تثبیت ریشه‏ای بود که می‏تواند این کلن را برای پروژه‏های گیاه‌پالایی در محیط‏های آلوده به سرب، مطلوب معرفی کند.

کلیدواژه‌ها


عنوان مقاله [English]

Tolerance of Populus euramericana 561/41 to different concentrations of lead

نویسندگان [English]

  • 'Atefeh Emami 1
  • Mas'oud Tabari Kouchaksaraei 2
  • Nader Bahramifar 3
  • Azadeh Salehi 4
1 M.Sc. Student Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
2 Prof., Department of Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
3 Assistant Prof., Department of Environment, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
4 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO)
چکیده [English]

In this study, phytoremediation potential of Populus euramericana clone 561/41 to Pb-contaminated soils (0, 500, 1000, 1500, 2000 mg Pbkg-1 soil) was investigated in greenhouse condition in a completely randomized design. The results showed that the survival was decreased about 19.9%, 35.8%, 55.6% and 60.3%  in the soil polluted with 500, 1000, 1500, 2000 mg Pbkg-1, respectively. However, increasing Pb did not lead to any notable changes in the length of root and stem. In addition, leaf area and biomass of root, stem, leaf and total (till 500 mg Pbkg-1 soil) did not decrease as well. The Pb concentration, content of plant organs, the greatest, and the lowest values allocated to root and leaf increased along with increasing Pb concentration of soil. The greatest values of translocation factor and tolerance indices of root, shoot and total plant were observed in 500 mg Pb kg-1. The results generally demonstrated the good tolerance of the seedlings of P. euramericana clone 561/41 to Pb heavy metal in 500 mg kg-1 concentration. At higher concentrations of Pb, the results presented an acceptable tolerance, though the tolerance index of seedlings was reduced. Due to significant accumulation of Pb in the root (phytostabilization), this clone can therefore be introduced as an appropriate clone for phytoremediation of Pb-contaminated soils.

کلیدواژه‌ها [English]

  • Contaminated soil
  • Lead
  • phytoremediation
  • translocation factor
  • Tolerance index
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