تاثیرآتشسوزی برفرسایش پاشمانی خاک درمراتع نیمه استپی کرسنک،چهارمحال وبختیاری

آب و خاک

مقاله 7، دوره 29، شماره 4، آبان 1394، صفحه 898-907  

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v0i0.31000

نویسندگان

داود بهارلویی ¹؛ شجاع قربانی دشتکی¹؛ بیژن خلیل مقدم²؛ مهدی نادری¹؛ پژمان طهماسبی¹

¹دانشگاه شهرکرد

²دانشگاه رامین اهواز

چکیده

پژوهش حاضر به منظور بررسی تاثیر آتش‌سوزی بر میزان فرسایش پاشمانی و برخی ویژگیهای وابسته به فرسایش خاک در مناطقی که طی سال‌های 1387، 1388، 1389 و 1390 در مراتع کرسنک دچار آتش‌سوزی شده‌اند، انجام گردیده است. نمونه برداری در سال 1391 انجام و از هر منطقه 16 نمونه (8 نمونه از منطقه سوخته شده و 8 نمونه به عنوان شاهد) از عمق 7-0 سانتی متری برداشته شد. فرسایش پاشمانی در 2 شیب 9 و 46 درصد با شدت بارش 2 میلی متر بر دقیقه با استفاده از کاسه پاشمان چند متغیره اندازه‌گیری شد. تجزیه و تحلیل آماری داده ها توسط آزمون t مستقل در سطح 5 درصد انجام شد. نتایج نشان داد که خاک پاشمان شده در مناطق سوخته ‌شده افزایش معنی‌دار در تیمار 1 سال پس از آتش سوزی در هر دو شیب 9 و 46 درصد و همچنین در تیمار 2 سال پس از آتش سوزی در شیب 46 درصد داشت. سایر ویژگی های اندازه‌گیری شده نیز (بجز کربنات کلسیم معادل) تحت تاثیر آتش‌سوزی قرار گرفته بود. همچنین بسیاری از ویژگی‌ها تنها در 2 سال اول پس از آتش‌سوزی دارای اختلاف معنی‌دار با مناطق شاهد بوده اند ولی در سال‌های سوم و چهارم پس از آتش‌سوزی به شرایط اولیه خود نزدیک گردیده اند.

کلیدواژه‌ها

فرسایش پاشمانی؛ ویژگی های خاک؛ مراتع

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