بررسی تولید رواناب و رسوب تحت رخدادهای یکسان بارندگی در خاک کشاورزری با اندازه متفاوت خاکدانه

آب و خاک

مقاله 9، دوره 29، شماره 6، بهمن 1394، صفحه 1590-1600   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v29i6.35299

نویسندگان

سیده فاطمه اسلامی^* ؛ علی رضا واعظی

دانشگاه زنجان

چکیده

آگاهی از میزان تغییرات رواناب و رسوب در رخدادهای باران می تواند در مدل سازی تولید رواناب و رسوب مفید واقع شود. از این رو این پژوهش با هدف بررسی تولید رواناب و رسوب خاکدانه ها طی رخدادهای یکسان باران در خاک کشاورزی به اندازه های مختلف خاکدانه انجام رسید. برای انجام این پژوهش، پنج کلاس اندازه خاکدانه از یک خاک لوم رس شنی به وسیله الک های مربوطه نمونه برداری شد. خاکدانه ها تا عمق 10 سانتی متری به پانزده فلوم با ابعاد 100 سانتی متر × 50 سانتی متر و عمق 15 سانتی متر در سه تکرار منتقل شد. سپس فلوم های محتوی خاکدانه در شیب 9 درصد قرار گرفته و تحت 10 رخداد باران شبیه سازی شده با شدت یکسان 60 میلی متر بر ساعت به مدت 30 دقیقه و فواصل زمانی پنج روز قرار گرفتند. در پایان هر رخداد مقدار رواناب و رسوب تولید شده در ظروف انتهای فلوم ها جمع آوری و اندازه گیری شد. نتایج نشان داد که تفاوتی معنی دار بین رخدادها از نظر رواناب (05/0p

کلیدواژه‌ها

باران شبیه سازی شده؛ ساختمان خاک؛ غلظت رسوب

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