اثر زغال‌های زیستی تهیه‌شده در دماهای مختلف بر قابلیت استفاده روی و پاسخ‌های ذرت در یک خاک آلوده به روی

آب و خاک

مقاله 6، دوره 32، شماره 4 - شماره پیاپی 60، آبان 1397، صفحه 779-793   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v32i4.72071

نویسندگان

پروین کبیری؛ حمیدرضا متقیان^* ؛ علیرضا حسین پور

دانشگاه شهرکرد

چکیده

فعالیت‌های انسانی، نقش مهمی بر توزیع ژئوشیمیایی فلزات سنگین داشته‌است و باعث ورود بیش از حد مجاز آنها به محیط زیست شده‌است. وجود فلزات سنگین در محیط زیست، اثرات سوئی بر خاک، آب‌های سطحی و آب‌های زیرزمینی دارد و حیات موجودات زنده را با خطرات جدی مواجه می-کند. اخیراً زغال زیستی به صورت گسترده‌ای جهت کاهش سمیت فلزات سنگین در خاک استفاده می‌شود. هدف این مطالعه بررسی تأثیر دمای گرماکافت زغال زیستی برگ گردو بر قابلیت استفاده و پاسخ‌های رشد ذرت در یک خاک شن‌لومی آهکی آلوده به فلزات سنگین بوده است. بدین منظور، در آزمایشی گلدانی مقادیر 0، 5/0، 1 و 2 درصد (وزنی) زغال زیستی تهیه‌شده در دماهای 200، 400 و 600 درجه سلسیوس با 3 کیلوگرم خاک در 3 تکرار مخلوط و به‌مدت 45 روز در شرایط گلخانه خوابانده شد. پس از خواباندن، در هر گلدان ذرت علوفه‌ای (رقم سینگل‌کراس 704) کشت و پس از دو ماه، پاسخ‌های رشد ذرت (وزن خشک اندام هوایی، وزن خشک ریشه، غلظت روی در اندام هوایی، غلظت روی در ریشه، ضریب تجمع زیستی و ضریب انتقال) و غلظت روی قابل استفاده (محلول و DTPA-TEA) خاک تعیین شد. نتایج نشان داد که با افزایش دمای گرماکافت زغال زیستی، رشد ذرت و ضریب انتقال روی افزایش می‌یابد. همچنین تیمار خاک‌ها با 2 درصد زغال زیستی تهیه‌شده در دمای 600 درجه سلسیوس، غلظت روی در اندام هوایی و ریشه را به‌ترتیب 6/21 و 0/33 درصد کاهش و وزن خشک اندام هوایی و ریشه را به‌ترتیب 4/131 و 7/116 درصد نسبت به شاهد افزایش داد. ضریب انتقال روی در سطوح مختلف زغال زیستی تفاوت معنی‌داری نداشت (05/0P>). نتایج نشان داد که با افزایش مقدار و دمای تهیه زغال‌های زیستی، غلظت روی محلول و روی عصاره‌گیری‌شده با DTPA-TEA کاهش معنی‌داری یافت (05/0P

کلیدواژه‌ها

برگ گردو؛ تثبیت گیاهی؛ گرماکافت

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