نوع مقاله : مقاله پژوهشی

نویسندگان

1 مربی علوم باغبانی،گروه علوم باغبانی،دانشکده کشاورزی،واحد تبریز،دانشگاه آزاد اسلامی،تبریز،ایران

2 عضو هیات علمی گروه علوم و مهندسی خاک دانشگاه تبریز

3 دانش اموخته کارشناسی ارشد

4 دانش آموخته کارشناسی ارشد

چکیده

شناخت شکل‌های شیمیایی مس در خاک و تعیین مقدار هر کدام از آن­ها، اطلاعات مفیدی برای ارزیابی وضعیت مس، حاصلخیزی خاک و تغذیه گیاه و شیمی مس در خاک در اختیار می­گذارد. به منظور کسب چنین اطلاعاتی، در این پژوهش مس قابل جذب خاک در 21 نمونه خاک آهکی سطحی (0-30 سانتی‌متر) از استان آذربایجان شرقی با شش روش مختلف شامل  DTPA، AB-DTPA، AC-EDTA، هیدروکسیل آمین هیدروکلراید، اکسالات آمونیوم مرجع و اکسالات آمونیوم سریع اندازه­گیری شد. شکل‌های شیمیایی مس نیز با روش اصلاح­شده سینگ و همکاران تعیین شدند. بر طبق نتایج حاصله بیشترین مقدار مس استخراج­شده با روش اکسالات آمونیوم سریع (mg kg-1 69/25) و کمترین آن با روش DTPA-TEA (mg kg-157/1) حاصل گردید. همچنین شکل‌های باقی­مانده (Cu-Residual) و پیوسته به اکسیدهای بلورین (Cu-CFeox)  بیشترین مقدار مس خاک را به خود اختصاص دادند. با توجه به ضرایب همبستگی چنین نتیجه­گیری شد که روش عصاره‎گیری AC-EDTA علاوه بر شکل­های تبادلی (Cu-Ex) و (Cu-CFeox) از مس باقی­مانده خاک (Cu-Res) نیز عصاره‌گیری کرد. عصاره‌گیر هیدروکسیل آمین در مقایسه با سایر عصاره­گیرها مس را بیشتر از منبع اکسیدهای منگنز استخراج کرد. نتایج تحلیل رگرسیونی نشان داد که شکل‌ Cu-CFeox بیشترین سهم را در مس عصاره­گیری­شده با عصاره‌گیرهای AB-DTPA ، AC-EDTA و DTPA در خاک‌های مورد مطالعه داشت. با توجه به روابط آماری احتمالا مس پیوسته به اکسیدهای آهن بلوری، منبع بالقوه­ای برای مس قابل‌جذب در خاک‌های آهکی مورد مطالعه بوده و از ویژگی­های شیمیایی خاک نیز محتوای کربنات کلسیم معادل مؤثرترین ویژگی­ است که فراهمی مس قابل‌جذب گیاه در خاک‌های مورد مطالعه را پیش‌بینی می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

Relationships between available Cu and its chemical fractions in some calcareous soils of East Azerbaijan province

نویسندگان [English]

  • Mahdieh Haghighat Afshar 1
  • Adel Reyhanitabar 2

1 Department of Horticultural Science,Faculty of Agriculture,Tabriz Branch, Islamic Azad University,Tabriz,Iran

2

3

4

چکیده [English]

Information about chemical forms of copper (Cu) is important for the evaluation of its status in soil and also understanding of soil fertility, plant nutrition and soil chemistry. To obtain such information, in this research available Cu was determined in 21 calcareous surface soil samples (0-30 cm) by six methods including DTPA, AB-DTPA, AC-EDTA, hydroxylamine, reference ammonium oxalate and rapid ammonium oxalate. Cu fractions were also determined by the modified sequential extraction procedures introduced by Singh et al. According to the results, rapid ammonium oxalate and DTPA-TEA methods extracted the maximum (25.69 mg kg-1) and minimum (1.57 mg kg-1) amounts of Cu, respectively. Also, Cu-residual and Cu-CFeox forms the greatest amount of Cu in studied soils respectively. AC-EDTA extraction method, in addition to Cu-Residual, extracted other fractions of copper such as Cu-Exchangeable, and Cu-CFeoxide. Hydroxylamine method extracted Cu mostly from the manganese oxides source compared to other methods. Regression analysis indicates that Cu-CFeox forms the maximum copper extracted by extractants AB-DTPA, AC-EDTA and DTPA in soils was studied. According to the statistical relationships presumably Cu-CFeox, does seem a potential source of available Cu in studied soils. Among chemical properties of soil, CCE content of the soils appear the most influential properties that predict available Cu in the studied soils.

کلیدواژه‌ها [English]

  • AC-EDTA
  • available Cu
  • DTPA
  • copper fractions
  • sequential extraction
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