اندازه‌گیری فرسایش خاک در بازه‌های مختلف زمانی در حوضۀ آبخیز معرف خامسان با استفاده از میخ‌های فرسایش

نوع مقاله: پژوهشی

نویسندگان

1 دانش ‏آموختۀ کارشناسی ‏ارشد گروه مهندسی آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه تربیت ‏مدرس، نور

2 استادیار گروه مهندسی آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه تربیت ‏مدرس، نور

3 استادیار گروه مرتع و آبخیزداری، دانشکدۀ منابع طبیعی دانشگاه کردستان، سنندج

چکیده

پژوهش حاضر به منظور اندازه‏گیری مقدار فرسایش در مقیاس‏های زمانی ماهانه، سه‏ماهه‏، شش‏ماهه و یک‏ساله انجام شد. سه شبکۀ میخ فرسایش در سه جهت شیب شمالی، شمال غربی و شرقی در زیرحوضۀ آبخیز شاهد در حوضۀ آبخیز معرف خامسان به‌منظور اندازه‏گیری فرسایش طی دورۀ زمانی مهر 1394 تا شهریور 1395 انتخاب شدند. به دلیل قرائت ماهانه میخ‏های فرسایش، از امکان تحلیل فرسایش در بازه‏های زمانی کمتر از یک سال (ماهانه، سه‏ماهه و شش‏ماهه) برای تعیین میزان مشارکت این بازه‏های زمانی در فرسایش سالانۀ خاک استفاده شد. بنابراین، با درنظرگرفتن قرائت میخ‏ها متوسط تغییرات ارتفاع خاک و در نهایت مقدار متوسط فرسایش خاک سالانه برابر با 22/17 تن در هکتار محاسبه شد. همچنین، مشارکت مقیاس‏های زمانی ماهانه، سه‏ماهه‏، شش‏ماهه در فرسایش سالانه نیز به‌ترتیب 81/5، 33/7 و 52/9 تن در هکتار برابر با 34، 43 و 55 درصد فرسایش سالانه محاسبه شد. به‏رغم وجود اختلاف درخور توجه در مقدار متوسط فرسایش در بازه‏های زمانی مختلف و مشارکت آنها در فرسایش سالانه، نتایج آزمون تحلیل واریانس یک‏طرفه نشان داد اثر مقیاس زمانی بر فرسایش خاک معنا‏دار نیست. دلیل اصلی نبود تفاوت معنا‏داری فرسایش خاک در مقیاس‏های زمانی مختلف، واریانس زیاد داده‏های حاصل از میخ‏های فرسایش ناشی از منابع متعدد خطا در روش یادشده بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Measuring Soil Erosion at Different Time Intervals in Khamsan Representative Watershed using Erosion Pins

نویسندگان [English]

  • Mohammad Derikvandi 1
  • Abdulvahed Khaledi Darvishan 2
  • Kamran Chapi 3
1 Department of Watershed Management, Faculty of Natural Resources, Tarbiat Modarres University, Noor, Iran.
2 Department of Watershed Management, Faculty of Natural Resources, Tarbiat Modarres University, Noor, Iran.
3 Department of Rangeland and Watershed Management, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran.
چکیده [English]

The present study was conducted to calculate the amount of erosion in monthly, quarterly, six-month and one-year time scales. Three erosion pin networks in three aspects of north, northwest and eastern slopes in control subwatershed of Khamsan representative watershed were selected in order to measure erosion during the period of October 2015 to September 2016. Due to the monthly records of erosion pins, the possibility of erosion analyzing in the intervals of less than one year (monthly, quarterly, and sixth) was used to determine the contribution of these periods in annual soil erosion. Therefore, considering pin records, the average changes in the height of the soil and, finally, the average amount of annual erosion was calculated about 17.22 t ha-1. Also, the participation of monthly, quarterly, and six month intervals in annual erosion was calculated to be 5.81, 7.33 and 9.52 t ha-1, respectively which are about 34, 43 and 55% of annual erosion. Despite significant differences in the average amount of erosion in different time periods and their participation in annual erosion, the results of one-way ANOVA showed that the effect of time scale on soil erosion is not significant.

کلیدواژه‌ها [English]

  • Erosion pin
  • Interrill erosion
  • Slope aspects
  • Soil splash
  • time scale
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