نقش جزء رس در نگهداشت کربن آلی محلول در خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 1. دانشجوی دکتری گروه علوم و مهندسی خاک، دانشگاه تهران

2 دانش آموخته کارشناسی ارشد گروه علوم و مهندسی خاک، دانشگاه تهران

چکیده

سه نوع خاک، متفاوت از نظر کانی رس غالب (اسمکتایت، ایلایت و آلوفان) و یک نمونه­ی کائولن از نظر نگهداشت کربن آلی محلول عصاره گیری شده از ورمی کمپوست مقایسه شدند. نمونه­ها با محلول حاوی کربن آلی با غلظت 200 میلی‌گرم در لیتر در تعادل گذاشته شدند. میزان کربن آلی محلول جذب شده از تفاوت میان میزان کربن آلی اولیه و نهایی نمونه­ها به دست آمد. ظرفیت جذب نمونه­ها به طور معنی داری متفاوت بود (p<0.01)، به ترتیب 47، 40، 18 و 7 میلی­گرم کربن آلی محلول بر گرم رس­های اسمکتایت،آلوفان، ایلایت و کائولن. نمونه­ی اسمکتایت به عنوان نمونه­ی برتر در جذب کربن آلی محلول شناسایی شد که این امر نشان می­دهد رس­های لایه لایه احتمالا ظرفیت نگهداری کربن آلی محلول بیشتری را دارا هستند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Role of Clay Fraction in Retention of Dissolved Organic Carbon in soil

نویسندگان [English]

  • A Fathi Gerdelidani 1
  • B Rahimzadeh 2
چکیده [English]

Three types of soil, differing in their dominant clay mineral (smectite, illite and allophone) and a kaolin samples were compared for retention of dissolved organic carbon (DOC) extracted from vermicompost. The samples were equilibrated with DOC solution (carbon content 200 mg.l-1). The amount of retained DOC was calculated from the difference between the initial and final OC contents. The retention capacity was significantly different among the samples (p<0.01), being 47, 40, 18, 7 mg adsorbed dissolved organic carbon/g clay respectively for smectite, allophane, illite and kaolin samples. The Smectite sample was recognized as superior one in dissolved organic carbon retention, suggesting that the layered clay minerals possibly had more capacity for DOC retention.

کلیدواژه‌ها [English]

  • allophane
  • dissolved organic carbon
  • illite
  • kaolin
  • smectite
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