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حکیمه طایفی رضا عرفانزاده مهدی عابدی

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<). میانگین ماده آلی ذره ای از 8/0 گرم بر کیلوگرم در منطقه شاهد به 7/0 گرم بر کیلوگرم در منطقه با شدت متوسط و از 7/0 گرم بر کیلوگرم در منطقه شاهد به 5/0 گرم بر کیلوگرم در منطقه با شدت زیاد آتش تنزل نشان داد. پایداری خاکدانه از 60/46 درصد در منطقه شاهد به 90/34 درصد در منطقه با شدت متوسط و از 10/37 درصد در منطقه شاهد به 80/30 درصد در منطقه با شدت زیاد آتش کاهش یافت. آتش باعث افزایش مقدار نیتروژن کل در شدت‌های مختلف شد.

جزئیات مقاله

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ارجاع به مقاله
طایفیح., عرفانزادهر., & عابدیم. (2016). تغییر ویژگی‌های شیمیایی خاک در مقابل آتش و شدت‌های مختلف آن. آب و خاک, 31(1), 302-311. https://doi.org/10.22067/jsw.v31i1.52052
نوع مقاله
علمی - پژوهشی