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محمد رحمانیان علیرضا حسین پور ابراهیم ادهمی حمیدرضا متقیان

چکیده

ویژگی¬های زیستی و شیمیایی محیط ریزوسفر از جمله فراهمی و اجزاء شیمیایی فلزات در آن با توده خاک متفاوت است. این پژوهش به منظور بررسی تغییر در قابلیت¬استفاده و اجزاء مس در ریزوسفر آفتابگردان (Helianthus annuus L.) در یک خاک شنی آلوده به مس تیمار¬شده با کلات-کننده¬ها (EDTA، اسید سیتریک و عصاره کود مرغی) در شرایط گلخانه¬ای انجام شد.EDTA و اسید سیتریک در سطوح غلظتی صفر، 5/0 و 1 ¬میلی-مول بر کیلوگرم خاک و عصاره کود مرغی در سطوح غلظتی صفر، 5/0 و 1 گرم بر کیلوگرم خاک استفاده شدند. تعداد سه بذر آفتابگردان در هر ریزوباکس کاشته شد. بعد از 10 هفته گیاهان برداشت شدند و خاک¬های ریزوسفری و توده جدا شدند. مس قابل¬استفاده با استفاده از 7 روش عصاره¬گیری شیمیایی و جزءبندی مس در خاک¬های ریزوسفری و توده اندازه‌گیری شد. ویژگی¬های خاک ریزوسفری با خاک توده متفاوت بود. مقدار مس عصاره¬گیری شده به روش¬های مختلف در خاک¬های ریزوسفری کمتر از خاک¬های توده بود. دامنه تغییرات مس عصاره¬گیری شده با عصاره¬گیرها از 023/0 تا 83/1 میلی¬گرم بر کیلوگرم بود. در خاک¬های ریزوسفری و توده تیمارشده با کلات¬کننده¬ها، بیشترین مقادیر مس به ترتیب در اجزاء باقیمانده، پیوند¬شده با ماده آلی، پیوند¬شده با اکسیدهای آهن و منگنز، پیوند¬شده با کربنات¬ها و تبادلی بود. میانگین اجزاء مس پیوند¬شده با کربنات¬ها، پیوند¬شده با اکسیدهای آهن و منگنز و جزء باقیمانده در شرایط ریزوسفری بیشتر از توده خاک بود. میانگین جزء پیوند¬شده با ماده آلی در شرایط ریزوسفری کمتر از توده خاک بود. دامنه تغییرات اجزاء مس از 81/2 تا 95/12 میلی¬گرم بر کیلوگرم بود.

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ارجاع به مقاله
رحمانیانم., حسین پورع., ادهمیا., & متقیانح. (2016). تغییر در قابلیت استفاده و اجزاء مس در ریزوسفر آفتابگردان در خاک آلوده تیمارشده با کلات کننده ها. آب و خاک, 31(2), 509-521. https://doi.org/10.22067/jsw.v31i2.53346
نوع مقاله
علمی - پژوهشی