بررسی توزیع شکل‌های شیمیایی آهن در تعدادی از خاک‌های آهکی باغ های پرتقال Citrus sinensis L.)) در منطقه داراب، جنوب‌شرقی استان فارس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 بخش مرتع و آبخیزداری، دانشکده کشاورزی و منابع طبیعی داراب، دانشگاه شیراز

2 بخش تولیدات گیاهی، دانشکده کشاورزی و منابع طبیعی داراب، دانشگاه شیراز

چکیده

کمبود آهن در خاک یک عامل محدودکننده برای رشد اکثر گیاهان است. ‌فراهمی آهن در خاک بستگی به توزیع شکل‌های شیمیایی آن در بین اجزای تشکیل دهنده خاک دارد، که خود تحت تأثیر برخی ویژگی‌های فیزیکوشیمیایی خاک است. هدف از پژوهش حاضر بررسی توزیع شکل‌های شیمیایی آهن در تعدای از خاک‌های آهکی باغ‌های پرتقال در منطقه داراب فارس و رابطه این شکل‌ها با برخی از خصوصیات فیزیکوشیمیایی خاک و غلظت آهن در برگ درختان پرتقال بود. برای جداسازی شکل‌های شیمیایی آهن در خاک از روش عصاره‌گیری دنباله‌ای استفاده شد. نتایج نشان داد که توزیع شکل‌های شیمیایی آهن در خاک‌های مورد مطالعه به صورت اکسیدهای آهن بلوری < آهن باقی‌مانده < اکسیدهای آهن بی‌شکل < آهن محلول و تبادلی < آهن آلی ≤ آهن کربناتی < آهن متصل به اکسید‌های منگنز بود. حدود 2/98 درصد از کل آهن خاک در شکل-های اکسیدهای آهن بلوری و آهن باقی‌مانده وجود داشت که نشان دهنده حضور عمده آهن خاک در شکل‌های غیر قابل استفاده گیاهی است. در میان شکل‌های شیمیایی آهن، تنها اکسیدهای آهن بی‌شکل با آهن قابل استفاده خاک (عصاره‌گیری شده توسط DTPA) و غلظت آهن برگ همبستگی مثبت و معنی‌داری نشان داد. همچنین، در بین ویژگی‌های خاک، ماده آلی، کربنات کلسیم معادل و ظرفیت تبادل کاتیونی از ویژگی‌های مؤثر در تعیین میزان قابلیت استفاده آهن و مقدار اکسید آهن بی‌شکل در خاک بودند. بین برخی از شکل‌های شیمیایی آهن در خاک همبستگی مثبت و معنی‌داری مشاهده شد که نشانگر رابطه‌ای پویا بین این شکل‌ها در خاک است. با توجه به نتایج به نظر می‌رسد که میزان ماده آلی خاک می‌تواند نقش مؤثری بر فراهمی آهن در خاک باغات پرتقال داشته باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Iron Chemical Fractions in Some Calcareous Soils of Orange (Citrus sinensis L.) Orchards in Darab Region, East southern of Fars Province

نویسنده [English]

  • hamidreza boostani 1
1 college of agriculture and natural resources of darab, shiraz university
چکیده [English]

Iron (Fe) deficiency in soil is a limiting factor for the growth of most plants. Fe availability in soil depends on distribution of Fe chemical forms among soil components which it is affected by physicochemical characteristics of soil. The aim of the present study was to investigate the distribution of Fe chemical fractions in some calcareous soils of orange orchards in Drab region (Fars province) and their relationships with some soil physicochemical properties and Fe concentration in leaves of orange trees. A sequential extraction procedure was used to fractionate Fe chemical forms in the studied soils. The results showed that the distribution of Fe chemical fractions in the studied soils were in the order: CFeOx > Fe-Res > AFeOx > Fe-WsEx > Fe-OM > Fe-Car > Fe-MnOx. There was about 98.2 percent of total soil-Fe in both CFeOx and Fe-Res fractions which it indicates the presence of Fe in unavailable forms for plant in the studied soils. Among the Fe chemical forms, AFeOx fraction only showed a significant and positive correlation with DTPA extractable Fe in soil and Fe concentration in leaves of orange trees. Also, among the soil properties, organic matter, calcium carbonate equivalent and cation exchange capacity were the effective characteristics of soil in determining the bioavailability of Fe and content of AFeOx form in soil. There were significant and positive correlations among some Fe chemical forms in soil that it represents a dynamic relationship between Fe chemical forms in soil. According to the results, it seems that the amount of soil organic matter can have an effective role on the availability of Fe in calcareous soils of orange orchards.

کلیدواژه‌ها [English]

  • Amorphous Fe oxides
  • Calcium carbonate equivalent
  • Cation exchange capacity
  • DTPA-extractable Fe
  • Organic matter
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