Landforms and soil order influence on the distribution and behavior of some soil micronutrients in several intermountain plains in southwestern Iran

Document Type : Research Paper


1 Department of Agriculture, Payame Noor University, Tehran, I. R. Iran

2 Soil and Water Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, AREEO, Ahvaz, I. R. Iran



The different landscape positions, the type of parent material and its formation processes, and the soil type significantly impact the distribution, behavior, and mobility of micronutrients. To investigate the effects of landscape and soil types on the distribution and behavior of micronutrient elements of iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn), some genetic horizons samples were collected from sixteen representative pedons in the calcareous soils of southwestern Iran. Subsequently, the concentrations of extractable trace elements were assessed using diethylene triamine pentaacetic acid (DTPA) as well as in their total form through digestion in concentrated nitric acid. The results showed that the change range in the available form of studied micronutrients varied between 2.5 to 31.2, 0.3 to 3, 2.1 to 60.2, and 0 to 3.8 mg kg-1 for Fe, Cu, Mn, and Zn respectively. The examination of the chemical forms of micronutrients in both surface and subsurface samples unveiled that the majority of the investigated chemical forms exhibited higher quantitative levels in the surface samples compared to the subsurface samples. v(%CaCO3) of the soil increased when the soil moisture regime largely depends on the percentage of organic carbon (% OC) content, soil texture, and type and content of clay minerals. The highest amounts of available micronutrient elements were found in Mollisols and Alfisols soil orders. Additionally, the highest available form of Cu, Zn, and Fe were found in lowland soil units (LL), while Mn was detected in piedmont plains (PP) landform. Consequently, it can be inferred that the cycling of micronutrients is influenced by varying levels of soil development, which in turn impact the properties of the soil.


Article Title [Persian]

تأثیر لندفرم ها و راسته‌های خاک بر توزیع و رفتار برخی عناصر ریزمغذی خاک در تعدادی از دشت های میان‌کوهی جنوب غرب ایران

Authors [Persian]

  • سیروس شاکری 1
  • ابوالفضل آزادی 2
1 گروه کشاورزی، دانشگاه پیام نور، تهران، ایران
2 بخش تحقیقات خاک و آب، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز، ایران
Abstract [Persian]

موقعیت‌های مختلف لنداسکیپ، نوع مواد مادری و فرایندهای تشکیل آن و تیپ خاک تأثیر بسـزایی در توزیـع، رفتـار و تحـرک‌پـذیری عناصر ریزمغذی دارند. به منظور بررسی اثر لندفرم ها و راسته های خاک بر توزیع و رفتار عناصر ریز مغذی آهن، منگنز، مس و روی، نمونه‌هایی از افق‌های ژنتیکی 16 پروفیل شاهد در خاکهای آهکی جنوب غرب ایران جمعآوری شدند و غلظت عناصر کم‌مصرف قابل استخراج با دی اتیلن تری آمین پنتا استیک اسید(DTPA) و شکل کل آنها از طریق هضم در اسید نیتریک غلیظ تعیین شدند. نتایج نشان داد دامنه تغییرات در شکل قابل استفاده عناصر ریز مغذی برای آهن 2/5 تا 3/2، برای مس 0/3 تا 3، برای منگنز 2/1 تا 60/2 و برای روی ضفر تا 3/8 میلی‌گرم بر کیلوگرم  متغیر بود. بررسی شکل­های شیمیایی عناصر ریز مغذی در نمونه‌های سطحی و زیر سطحی خاک­های مورد مطالعه نشان از برتری کمّی اغلب شکل‌های شیمیایی عناصر ریز مغذی مورد مطالعه در نمونه‌های سطحی نسبت به نمونه های زیرسطحی داشت. نتایج همبستگی نشان داد که  مقادیر عناصر ریزمغذی موجود تا حد زیادی به مقدار کربن آلی، بافت خاک و نوع و میزان کانی­های رس بستگی دارد. بیشترین مقدار  شکل قابل استفاده عناصر ریزمغذی در خاک‌های راسته های مالی‌سول و آلفی سول وجود داشت. بیشترین میزان آهن، روی و مس قابل استفاده در واحدهای اراضی پست و بیشترین مقدار منگنز درواحد اراضی یا لندفرم دشت دامنه‌ای مشاهده شد. بنابراین می‌توان گفت درجه متفاوت تکامل خاک از طریق تاثیر بر ویژگی‌های خاک، چرخه عناصر ریزمغذی را تحت تاثیر قرار می‌دهد.

Keywords [Persian]

  • دشت‌های میان‌کوهی
  • راسته‌های خاک
  • عناصر ریزمغذی
  • لندفرم
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