بررسی اثر کاربرد کمپوست زباله شهری بر جزء بندی برخی فلزات سنگین در سه کلاس بافتی خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد شیمی و حاصلخیزی خاک دانشگاه بوعلی سینا همدان

2 استادیار گروه خاکشناسی دانشگاه بوعلی سینا همدان، دانشکده کشاورزی

3 گروه کشاورزی دانشگاه پیام نور

4 دانشجوی دکتری فیزیک و حفاظت خاک دانشگاه گیلان

5 دانشجوی دکتری فیزیک و حفاظت خاک دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

استفاده از کمپوست زباله شهری برای افزایش کیفیت خاک، روش مناسبی به شمار می­رود البته این کودها حاوی فلزهای سنگین هستند. برای انجام این پژوهش، از سه کلاس بافتی خاک شامل رسی، لومی و لوم شنی استفاده شد این خاک­ها را با پنج سطح تیمار کمپوست: 0، 20، 40، 80 و 120 تن در هکتار مخلوط شدند و آزمایش در  قالب طرح آزمایشی کاملاً تصادفی در سه تکرار اجرا گردید. بعد از انجام آزمایش­های پایه محتوای فلزهای سنگین (روی، مس، نیکل، کادمیوم، سرب و منگنز) در بخش­های مختلف مورد بررسی قرار گرفت، نتایج نشان داد که افزایش مقدار مصرف کمپوست سبب افزایش غلظت غالب فلزهای سنگین در تمام بخش­های محلول، آلی، کربناتی و باقیمانده شد. همچنین مصرف کمپوست در خاک باعث افزایش pH، EC خاک شد. افزایش غلظت عناصر در بافت رسی نسبت به دو بافت دیگر بیشتر بود و بخش­های باقیمانده، کربناتی، آلی و محلول به ترتیب دارای بیشترین اندازه عناصر بودند. بیشترین میزان فلز سنگین در بخش محلول مربوط به عنصر منگنز بود و کمترین میزان مربوط به عنصر روی در بافت لوم شنی گزارش شد. با توجه به نتایج بدست آمده توصیه می­شود در مصرف کودهای کمپوست، ضمن اندازه گیری محتوای فلزات سنگین، طی برنامه­های منظم، پایش لازم در این زمینه به عمل آید. 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Municipal Solid Waste Compost Application on the Fractions of Various Heavy Metals in Three Soil Textures

نویسندگان [English]

  • M. Yari 1
  • G. Rahimi 2
  • S. Moradi 3
  • E. Ebrahimi 4
  • S. Sadeghi 5
چکیده [English]

The use of municipal solid waste compost has been considered as an appropriate method for the improvement of soil quality in spite of having heavy metals. For this study, three types of soil textures including clay, loam, and sandy loam soil were used. These soils were mixed with five levels of compost treatments (0, 20, 40, 80 and 120 ton/ha) and this research was done using factorial arrangement in a completely randomized design with three replications. After some basic experiments, the content of heavy metals such as Zn, Cu, Ni, Cd, Pb, and Mn were measured in the various sectors. The results showed that increasing the amount of compost application increased the concentration of heavy metals in all solution, organic, carbonate and residual parts of soils as well as soil pH and EC. The increase in the concentration of these elements was more in the clay soil compared to the other two soil textures. Furthermore, the highest amounts of these elements in decreasing order were as follows: residual fractions> carbonate> organic> dissolved parts, respectively. The maximum amount of heavy metals in the solution part belonged to Mn, while Zn accounted for the minimum amount of heavy metal in the sandy loam. According to the results, it is recommended that, in the application of such compost fertilizers, in addition to measuring the heavy metals contents of these fertilizers, the necessary monitoring should be implemented with regular programs.

کلیدواژه‌ها [English]

  • Soil pollution
  • Zinc
  • Lead
  • COPPER
  • Cadmium
  • Soil quality
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