اثر بخشی کلات DTPA بر قابلیت دسترسی کادمیم در یک خاک تیمار شده با لجن فاضلاب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد گروه خاکشناسی، دانشکده کشاورزی و منابع طبعی، دانشگاه آزاد اسلامی واحد اراک

2 استادیار گروه خاکشناسی، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

چکیده

استفاده از لجن فاضلاب به‌عنوان کود در اراضی کشاورزی در بسیاری کشورها رایج است که می‌تواند نقش مؤثری بر عملکرد گیاه داشته باشد. البته این افزودنی‌های آلی می‌توانند باعث افزایش فلزات سنگین در خاک شوند. این پژوهش با هدف بررسی اثربخشی کلات DTPA بر قابلیت دسترسی کادمیم در گیاه ذرت در یک خاک تیمار شده با لجن فاضلاب در شهرستان اراک صورت پذیرفت. تیمارهای آزمایشی شامل کاربرد لجن فاضلاب (0، 15 و 30 تن در هکتار) آلوده شده با کادمیم در مقادیر0 ،5، 10 و 15 میلی‌گرم در کیلوگرم و کاربرد کلات DTPA به مقدار 0 و 5/1 میلی‌مول بر کیلوگرم خاک بود. بعد از گذشت 60 روز از کاشت ذرت، ویژگی‌‌های فیزیکی- شیمیایی خاک و غلظت کادمیم در خاک و گیاه ذرت اندازه‌گیری شد. کاربرد 5/1 میلی‌مول کلات DTPA در خاک آلوده به 5 میلی‌گرم کادمیم، باعث افزایش معنی‌دار میزان کادمیم قابل دسترس خاک شد. افزودن کلات DTPA به خاک حاوی 30 تن در هکتار لجن فاضلاب آلوده به 10 میلی‌گرم کادمیم به ترتیب باعث افزایش17 و 25 درصدی در میزان کادمیم در ریشه و ساقه گیاه ذرت شد. نتایج به‌دست آمده از این تحقیق حاکی از آن است که همزمان با افزایش کاربرد لجن فاضلاب اثربخشی استفاده از کلات جهت گیاه‌پالایی کادمیم کاهش یافته است، به‌طوری که کمترین اثر بخشی گیاهپالایی مربوط به تیماری بوده که بیشترین سطح لجن فاضلاب (30 تن در هکتار) با کمترین سطح آلودگی ( 5 میلی گرم کادمیم) را داشته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effectiveness of DTPA Chelate on Cd Availability in Soils Treated with Sewage Sludge

نویسندگان [English]

  • Pegah Houshyar 1
  • Amirhossein Baghaei 2
1 Former Graduate Student of Soil Scinece, Arak Branch, Islamic Azad University, Arak, Iran
2 Assist. Prof. of Soil Science, Arak Branch, Islamic Azad University, Arak, Iran
چکیده [English]

Application of sewage sludge as a fertilizer on farmlands is a common practice in most countries. Although the practice may play a positive role in plant performance, the organic amendments introduced may increase the soil heavy metals content. This study was conducted in Arak, Iran, to investigate the effectiveness of DTPA chelate on corn Cd availability in a sewage sludge treated soil. The treatments consisted of sewage sludge (0, 15, and 30 t ha-1) polluted with cadmium applied at 0, 5, 10, and 15 mg kg-1 as well as DTPA applied at 0 and 1.5 mmol kg-1 soil. Corn plants were then grown in the soil in each treatmnent and, on day 60, the physic-chemical characteristics and Cd quantities were measured ion both the corn plants and soil samples. Application of 1.5 m mol of DTPA chelate in soil contaminated with 5 mg Cd led to a significant increase in the soil available Cd content. It was also observed that application of DTPA chelate to soils containing 30 t ha-1 of sewage sludge polluted with 10 mg Cd increased root and shoot Cd concentrations by 17 and 25%, respectively. Results indicated the effectiveness of DTPA chelate in reducing Cd phytoremediation with increasing sewage sludge loading rate. This was evidenced by the lowest phytoremediation effectiveness observed for the treatment with the greatest sewage sludge loading (30 t ha-1) and the lowest cadmium pollution (5 mg Cd).

کلیدواژه‌ها [English]

  • Effectiveness
  • sewage sludge
  • Chelate
  • Cadmium
  • Phytoremediation

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