تغییر ویژگی‌های شیمیایی خاک در مقابل آتش و شدت‌های مختلف آن

آب و خاک

مقاله 1، دوره 31، شماره 1 - شماره پیاپی 51، اردیبهشت 1396، صفحه 302-311   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v31i1.52052

نویسندگان

حکیمه طایفی؛ رضا عرفانزاده^* ؛ مهدی عابدی

دانشگاه تربیت مدرس

چکیده

در بین رویشگاه های مختلف، آتش یک فاکتور اکولوژیک و تعیین کننده است که بسیاری از ویژگی های فیزیکی، شیمیایی و زیستی خاک تحت تاثیر آن تغییر می کند که وسعت و مدت زمان این اثرات به شدت آتش سوزی بستگی دارد. به منظور بررسی تاثیر آتش و شدت های مختلف آن بر ویژگیهای شیمیایی مختلف خاک در جنوب شرقی پارک ملی گلستان، منطقه ییلاق دشت با ارتفاع 1400 متر و پوشش علفی، بوته‌ای و درختچه‌ای انتخاب شد. مناطق کنترل نیز در مجاور مناطق آتش گرفته هر سه نوع پوشش گیاهی با مشخصات اکولوژیک یکسان مشخص شدند. نمونه های خاک در مناطق با و بدون رخداد آتش از عمق 0-5 سانتی‌متری زیراشکوب سه نوع پوشش گیاهی برداشت شد و ویژگی های خاک شامل ماده آلی، ماده آلی ذره ای، نیترژن کل و پایداری خاکدانه ها اندازه گیری شد. نتایج نشان داد آتش در هیچکدام از شدت‌ها تاثیر معنی‌داری بر میزان ماده آلی نداشت در حالی‌که ماده آلی ذره ای و پایداری خاکدانه در شدت‌های متوسط و زیاد در مقابل آتش کاهش نشان داد (05/0P

کلیدواژه‌ها

آتش سوزی طبیعی؛ پارک ملی گلستان؛ پایداری خاکدانه؛ مواد آلی ذره ای خاک

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