پاسخ کرم خاکی Eisenia fetida به تنش شوری و آلودگی سرب در خاک تیمار شده با کود گاوی

آب و خاک

مقاله 4، دوره 31، شماره 5 - شماره پیاپی 55، دی 1396، صفحه 1355-1370   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v31i5.61802

نویسندگان

مینا نظری زاده^* ؛ فایز رئیسی؛ حمیدرضا متقیان

دانشگاه شهرکرد

چکیده

شوری و آلودگی ناشی از فلزات سمی به‌عنوان دو تنش زیست‌محیطی می‌توانند به‌صورت هم‌زمان رشد و فعالیت کرم‌های خاکی را تحت تأثیر قرار دهند. اثر مشترک این دو تنش غیرزیستی بر کرم‌های خاکی، به‌ویژه در نواحی خشک و نیمه‌خشک، کمتر مورد بررسی قرار گرفته است. با توجه به اهمیت کرم‌های خاکی در زیست‌بوم، بررسی اثرمتقابل عوامل تنش‌زا بر رشد و فعالیت این جانداران ضروری است. در این پژوهش اثر مشترک شوری ناشی از نمک کلرید سدیم و آلودگی سرب بر جمعیت و فعالیت کرم‌های خاکی Eisenia fetida در شرایط گلخانه‌ مطالعه شد. این آزمایش با 3 فاکتور شامل آلودگی (شاهد و 30 میلی‌گرم سرب بر کیلوگرم خاک)، شوری (شاهد، 4 و 8 دسی‌زیمنس بر متر) و کود گاوی (شاهد و 4 درصد وزنی)، به‌صورت فاکتوریل در قالب طرح پایه‌ی کاملاً تصادفی با 4 تکرار اجرا گردید. نتایج نشان داد که افزایش سطوح شوری خاک قابلیت دسترسی سرب را افزایش می‌دهد و سمیت این فلز را برای کرم‌های خاکی تشدید می‌کند. در مقابل افزودن کود گاوی در همه‌ی سطوح شوری، قابلیت دسترسی این فلز را کاهش می‌دهد. جمعیت، وزن مرطوب و خشک کرم و وزن مرطوب و خشک فضولات تولید شده توسط کرم‌های خاکی به‌صورت معنی‌دار (05/0p

کلیدواژه‌ها

اثر مشترک؛ تنش زیست‌محیطی؛ تولید فضولات؛ قابلیت دسترسی سرب

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