تعیین شکل‌های شیمیایی مس و روابط آن‌ها با ویژگی‌های خاک در برخی خاک‌های استان آذربایجان شرقی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز

2 دانشیاران گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز

چکیده

شناخت شکل­های مختلف مس خاک و تعیین مقدار هر یک از آن­ها اطلاعات مفیدی را برای ارزیابی وضعیت مس و نیز شیمی مس در خاک در اختیار می­گذارد. برای کسب چنین اطلاعاتی، مقدار و توزیع شکل­های مختلف مس در 21 نمونه مرکب خاک استان آذربایجان شرقی به‌روش عصاره­گیری دنباله­ای تغییر یافته سینگ و همکاران تعیین و رابطه این شکل­ها با یکدیگر و با ویژگی­های خاک مطالعه گردید. بر طبق نتایج حاصله دامنه تغییرات مس کل بین 5/90 - 5/21 میلی­گرم بر کیلوگرم خاک با میانگین 37 میلی­گرم بر کیلوگرم خاک بود. ضرایب همبستگی ساده نشان داد که درصد شن و سیلت با مس متصل به اکسیدهای آهن بی­شکل همبستگی معناداری (p<0.05) داشتند. درصد سیلت با مس آلی و مس متصل به اکسیدهای آهن بی­شکل همبستگی معناداری(p<0.05) داشت. درصد کربنات کلسیم معادل و کربنات کلسیم معادل فعال با شکل تبادلی مس همبستگی معناداری(p<0.05) داشت. از میان شکل­های مس، شکل تبادلی، مس متصل به اکسیدهای آهن بلورین و مس کل رابطه مثبت معناداری با مس قابل جذب داشتند که در بین آن­ها مس متصل به اکسیدهای آهن بلورین بالاترین ضریب همبستگی (*۵۳/۰=r) را داشت. ترتیب شکل­های مختلف مس به صورت مس باقی­مانده (Cu-Res) > مس متصل به اکسیدهای آهن بلورین (Cu-CFeOX) > مس متصل به اکسیدهای آهن بی‌شکل (Cu-AFeOX) > مس متصل به مواد آلی (Cu-OM) > مس کربناتی (Cu-Car) > مس تبادلی (Cu-Ex)> مس متصل به اکسیدهای منگنز (Cu-MnOX) بود. در این تحقیق بین برخی شکل­های مختلف مس همبستگی معناداری بدست آمد که احتمالاً بیان‌گر یک رابطه پویا بین آن­ها می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of Copper Fractions and their Relations with Soil properties in Some Soils of East Azerbaijan Province

نویسندگان [English]

  • O Kamangar 1
  • A Reyhanitabar 2
  • SH Oustan 2
1 Former M.Sc. Student, Dept. of Soil Sci., Univ. of Tabriz, Iran
2 Assoc. Prof., Dept. of Soil Sci., Univ. of Tabriz, Iran
چکیده [English]

Knowledge about different forms of Cu and determining the amount of each one provides useful information for evaluation of soil Cu status and also understanding soil Cu chemistry. To obtain such information, the amount and distribution of Cu in different fractions of 21 composite soil samples of East Azerbaijan Province were determined by modified sequential extraction procedure introduced by Singh et al and the relationships of these fractions with each other and with soil properties were also investigated. According to the results, total Cu concentrations of soils ranged from 21.50 to 90.57 mg/kg with a mean value of 37 mg/kg. Sand and silt percentage with Cu associated with amorphous Fe oxides had significant correlation. Silt content had significant correlation with organically copper and amorphous Fe oxides bounded Cu. Both calcium carbonate equivalent and active calcium carbonate equivalent had significant correlation with exchangeable copper. Among the copper forms, Cu-Ex, Cu-CFeOX and total Cu had positive and significant relations with soluble Cu and among them Cu-CFeOX had highest correlation coefficient value (r =0.53*). The order of various forms of soil Cu was found to be as follows: Residual copper (Cu-Res) > crystalline Fe oxides bound (Cu-CFeOX) > amorphous Fe oxides bound (Cu-AFeox) > organically bound (Cu-OM) > carbonates bound (Cu-Car) > soluble + exchangeable (Cu-Ex) > Mn oxide bound (Cu-Mnox). In this study a significant correlation was also observed between some forms of Cu, which is presumably a reflection of the existence of a dynamic relation between them in soil.

کلیدواژه‌ها [English]

  • Calcareous soils
  • Copper Fractions
  • East Azerbaijan
  • Sequential extraction
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