اثر برهمکنش آهن و سرب بر کاهش قابلیت دسترسی سرب توسط گیاه ذرت در یک خاک آلوده به سرب

آب و خاک

مقاله 3، دوره 31، شماره 4 - شماره پیاپی 54، مهر 1396، صفحه 1187-1199   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v31i4.59049

نویسندگان

نرگس تبرته فراهانی^{* 1}؛ امیر حسین بقائی²

¹واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

²دانشگاه آزاد اسلامی واحد اراک

چکیده

هدف این تحقیق بررسی اثر کود گاوی غنی‌شده با لجن کنورتور بر مقدار جذب سرب توسط گیاه ذرت در یک خاک آلوده به سرب بود. تیمارهای آزمایشی شامل کاربرد مقادیر 0، 15 و 30 تن در هکتار کود گاوی غنی شده با لجن کنورتور (‌به میزان 0 و 5 درصد وزنی آهن خالص) و همچنین خاک تیمار شده با مقادیر 0، 200، 300 و400 میلی‌گرم سرب در کیلوگرم خاک از منبع نیترات سرب می‌باشد. سپس کود گاوی غنی شده به خاک آلوده به سرب اضافه و بذر ذرت (سینگل کراس 704) کاشته شد. بعد از گذشت 60 روز از شروع آزمایش، ویژگی‌های فیزیکی، شیمیایی خاک و غلظت سرب در خاک و گیاه ذرت اندازه‌گیری شد. کاربرد کود گاوی غنی شده با لجن کنورتور تاثیر معنی‌داری بر کاهش غلظت سرب ریشه و شاخساره گیاه داشت، به صورتی که کاربرد 30 تن در هکتار کود گاوی غنی شده در خاک آلوده به 300 میلیگرم سرب به ترتیب باعث کاهش 2 و 5/1 برابری در غلظت سرب ریشه و شاخساره گیاه شد. نتایج کلی این تحقیق حاکی از آن است که کاربرد کود گاوی غنی شده با 5 درصد آهن خالص از ترکیب لجن کنورتور احتمالاً توانسته است باعث کاهش قابلیت دسترسی سرب در خاک و گیاه شود که در این‌جا می‌توان به نقش بخش معدنی و آلی کود گاوی در کاهش قابلیت دسترسی به سرب اشاره کرد، هر چند که نقش اثر برهمکنش سرب و آهن در کاهش جذب سرب به وسیله گیاه نبایستی نادیده گرفته شود.

کلیدواژه‌ها

آلودگی؛ غنی‌سازی؛ فلزات سنگین؛ کود گاوی؛ لجن کنورتور

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