شکل‌های مختلف آهن و منگنز و توزیع آنها در تجمعات و نیمرخ برخی آلفی‌سولهای تحت تأثیر شرایط اکسایش و کاهش

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه مهندسی علوم خاک دانشگاه تهران

2 عضو هیأت علمی گروه مهندسی علوم خاک دانشگاه تهران

چکیده

میزان و توزیع آهن و منگنز و تجمعات آنها منعکس کننده بسیاری از فرآیند ها و شرایط پیداشی خاک است. تجمعات آهن و منگنز ویژگی­های متفاوتی نسبت به متن خاک داشته و در شرایط محیطی متفاوتی تشکیل می­شوند و از دو دیدگاه پیدایش و رده بندی خاک و زیست محیطی اهمیت دارند. به منظور بررسی فراوانی و پراکنش شکلهای مختلف آهن و منگنز، عوامل موثر بر آنها و مقایسه خصوصیات تجمعات آهن و منگنز با متن خاک هفت نیمرخ متأثر از شرایط اکسایش و کاهش و پنج افق حاوی تجمعات مطالعه شدند. چهار فرم آهن شامل آهن کل (Fet)، اکسیدهای آهن آزاد (Fed)، آهن غیربلورین (Feo) و قابل استخراج با DTPA و دو فرم منگنز شامل منگنز کل (Mnt) و قابل استخراج با DTPA اندازه­گیری شدند. همچنین مطالعات کانی­شناسی تجمعات و بررسی تجزیه عنصری به روش  EDSتوسط میکروسکوپ الکترونی روبشی (SEM) انجام شد. نتایج نشان داد که میزان مواد آلی و درصد رس مهمترین عوامل مؤثر بر فراوانی و اشکال مختلف آهن و منگنز در نیمرخ­های مورد­ مطالعه هستند. شرایط متفاوت تجمعات با محیط پیرامون خود موجب افزایش مقادیر Mnt،Fet ،  Feo، Fed و نسبت Feo/Fed در تجمعات نسبت به متن خاک شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Iron andManganese Forms and Their Distribution in Concretions and Profiles of Some AlfisolsInfluenced by Redox Condition

نویسندگان [English]

  • Mohammad Javad Mohebbi 1
  • Ahmad Heidari 2
  • F. Sarmadian 2
  • G.R. . Savaghebi 2
  • Alireza Raheb 1
1 MSc student University of Tehran, College of Agriculture.Soil Science Department
2 Assistant Professor University of Tehran, College ofAgriculture.Soil Science Department
چکیده [English]

Amount and distribution of iron and manganese and their concretionsreflect a lot of processes involved in soil genesis. Fe-Mnconcretionsshow different characteristics ofsoil matrix and occur in different environmental conditions and are important in both soil genesis,classification, and environmental aspects. The objective of the present study was to investigate abundance and distribution of Fe and Mn chemical forms andthe factors affecting them and to comparecharacteristics ofFe and Mnconcretionswith their adjacent soil matrix. To this end, seven profiles affected by redox conditions and five horizons were studied. Four forms of iron, including total iron (Fet), free iron oxides (Fed), amorphous (Feo) and DTPA extractable iron, and two forms of Mn, including total Mn (Mnt) and DTPA extractable Mn, were measured. Also, to studythe concretions and theirmineralogical properties,Scanning Electron Microscopy (SEM) was used. Results showed that organic matter and clay content werethe most important factors influencing different forms of Fe and Mn in the studied soils. Distinct contradictory conditions of micro-zones of the Fe and Mnconcretionswith their adjacent environment caused higher concentrations of Fed, Fet, Feo, MntandFeo/Fed ratio in Fe-Mnconcretionscompared to the adjacent soil matrix.

کلیدواژه‌ها [English]

  • Soil genesis
  • Free iron oxides
  • Total Mn
  • Amorphous Fe
  • Organic matter

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پژوهش های خاک
دوره 26، شماره 1
خرداد 1391
صفحه 43-53

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