تأثیر بیوچارهای تولید شده در دماهای مختلف بر قابلیت جذب کادمیم یک خاک آهکی در شرایط رطوبتی مختلف در طی زمان

آب و خاک

مقاله 1، دوره 31، شماره 3 - شماره پیاپی 53، مرداد 1396، صفحه 811-821   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v31i2.53258

نویسندگان

بنفشه افراسیابی؛ ابراهیم ادهمی^* ؛ حمیدرضا اولیایی

دانشگاه یاسوج

چکیده

مطالعه حاضر به منظور بررسی اثر نوع و سطوح مختلف بیوچار در شرایط مختلف رطوبتی بر قابلیت جذب کادمیم افزوده شده به یک نمونه خاک آهکی طی یک دوره 90 روزه انجام شد. آزمایش بصورت فاکتوریل 2×9 در قالب طرح کاملا تصادفی در دو تکرار انجام شد. تیمار‌ها شامل مصرف بیوچار در 9 سطح شامل: عدم مصرف بیوچار (شاهد) و تفاله خام پسته و بیوچار تهیه شده آن در دما‌های 200، 400 و 600 درجه سلیسیوس در مقادیر 2 و 4 درصد وزنی، و رطوبت در 2 سطح (غرقاب و رطوبت بیست درصد وزنی) در دو تکرار بود. نمونه‌‌ها با مقادیر 25 و 50 میلی‌گرم کادمیم بر کیلوگرم از منبع نیترات کادمیم آلوده شدند. در زمان‌های 15، 30، 60 و 90 روز کادمیم قابل جذب با عصاره‌گیر DTPA اندازه‌گیری شد. تجزیه واریانس داده‌ها نشان داد که در همه زمان‌ها و هر دو غلظت کادمیم کاربردی برهمکنش بیوچار و رطوبت اثر معنی‌داری بر کادمیم قابل جذب در سطح یک درصد آماری داشت. با گذشت زمان قابلیت جذب کادمیم در همه تیمار‌ها کاهش یافت. بیوچار تهیه شده در دمای 600 درجه سلیسیوس بیشترین تأثیر را بر کاهش قابلیت جذب کادمیم نشان داد و با افزایش سطح مصرف بیوچار قابلیت جذب کادمیم کاهش یافت. در رطوبت 20 درصد وزنی بیوچار دمای 600 کادمیم قابل دسترس کمتری در مقایسه با شرایط غرقاب نشان داد در حالی که در تیمار‌های تفاله پسته، بیوچار دمای 200، 400 روند معکوسی مشاهده گردید.

کلیدواژه‌ها

آلودگی خاک؛ پوسته سبز پ‍سته؛ فلزات سنگین؛ غرقاب

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