تغییرات شکل های شیمیایی و زیست فراهمی روی با فاصله از ریزوسفر منفرد و مشترک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد خاکشناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

2 استاد خاکشناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

3 استادیار خاکشناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

چکیده

توزیع شکل­های مختلف روی در خاک، باعث پیچیدگی رفتار آن در خاک می­گردد. به منظور بررسی تغییرات شکل‌های مختلف روی با فاصله از ریزوسفر ذرت و کلزا در سیستم کشت منفرد و مخلوط، آزمایشی در سیستم جعبه ریزوسفر انجام شد. با ناحیه­بندی فضای داخل جعبه ریزوسفر به 4 ناحیه، بذرهای ذرت و کلزا در ناحیه مرکزی جعبه ریزوسفر (ناحیه ریزوسفر) کشت شدند. گیاهان بعد از پایان دوره رشد برداشت شده و خاک هر ناحیه جداگانه تجزیه گردید. نتایج نشان داد که کشت گیاه با کاهش pH و افزایش کربن آلی محلول خاک، جزءبندی روی را در خاک تغییر داده و زیست‌فراهمی روی را افزایش داد. همچنین با فاصله از ریشه، pH افزایش و کربن آلی محلول خاک کاهش یافت. شکل‌های تبادلی، وابسته به مواد آلی، اکسیدی و قابل جذب روی با فاصله از ریشه تغییر یافت. زیست­فراهمی روی با کربن آلی محلول و بخش­های تبادلی، وابسته به مواد آلی و کربناته همبستگی مثبت و با pH و بخش اکسیدی روی همبستگی منفی نشان داد. کشت مخلوط باعث کاهش غلظت روی در شاخساره ذرت و کلزا شد. عملکرد شاخساره و مقدار جذب روی در شاخساره کشت مخلوط بیشتر از ذرت بود. فاکتور انتقال روی در کشت مخلوط بیشتر از ذرت و کمتر از کلزا اندازه­گیری شد.

کلیدواژه‌ها


عنوان مقاله [English]

Changes in Chemical Forms and Bioavailability of Zinc by Distance from Rhizosphere of Single and Mixed Culture

نویسندگان [English]

  • Yaser Azimzadeh 1
  • Hosein Shariatmadari 2
  • Mehran Shirvani 3
1 MSc. Student of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan
2 Professor of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan
3 Assistant Professor of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan
چکیده [English]

Heavy metals behavior in soil is complicated due to their different chemical forms. To investigate the effects of single and mixed rhizosphere of canola and corn on chemical forms and DTPA extractability of zinc, this experiment is set up using a rhizobox system. The rhizoboxes divided into four different parts and canola and corn were seeded in the middle part mixed or separately. The plants were harvested after the growth period and the soil samples were taken from different parts of the rhizoboxes. The results showed that, due to the decrease in pH and increase in dissolved organic carbon, the distribution of different forms of zinc changed in rhizosphere as compared to the bulk soil.  The DTPA extractability of Zn is increased in the rhizosphere, while decreased with distance from the root.  The soil pH increased and the DOC decreased from rhizosphere toward the bulk soil while the exchangeable, organic bound and oxide forms of zinc changed differently. There was a positive correlation between DOC and DTPA extractable, exchangeable, and organic and carbonate bound forms of zinc while the correlation between these forms and soil pH and oxide bound Zn was negative. Zinc concentrations in corn and canola shoot decreased while zinc uptake increased over corn in mixed culture. The Zn transport factor from root to shoot in mixed culture was greater than corn but lower than canola in single culture.

کلیدواژه‌ها [English]

  • zinc
  • Rhizosphere
  • mixed culture
  • rhizobox
  • fractionation
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