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تحلیل مقایسه‌ای عامل فرسایش‌پذیری خاک در حوضۀ آبخیز شازند | ||
| اکوهیدرولوژی | ||
| مقاله 13، دوره 6، شماره 1، فروردین 1398، صفحه 153-163 اصل مقاله (1.16 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2018.269592.985 | ||
| نویسندگان | ||
| محبوبه کیانی هرچگانی* 1؛ سید حمیدرضا صادقی2؛ سامره فلاحتکار3 | ||
| 1پژوهشگر پسادکتری علوم و مهندسی آبخیزداری، دانشکدۀ منابع طبیعی دانشگاه تربیت مدرس | ||
| 2استاد گروه مهندسی آبخیزداری، دانشکدۀ منابع طبیعی دانشگاه تربیت مدرس | ||
| 3استادیار گروه مهندسی محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس | ||
| چکیده | ||
| فرسایش خاک نوعی مشکل جدی محیطی، اجتماعی و اقتصادی است که نه تنها سبب تخریب شدید زمین و هدررفت خاک می‌شود، بلکه تهدید ثبات و سلامت جامعه و بهطور کلی توسعۀ پایدار آن را در پی دارد. فرسایش خاک با متغیرهای مختلف خاک، اندازهگیریها و محاسبات آنها مرتبط است. یکی از عوامل مهم در تعیین فرسایش خاک، فرسایش‌پذیری خاک (K) است. روشهای مختلفی برای تعیین عامل فرسایش‌پذیری خاک با استفاده از مدلهای تجربی یا اندازهگیریهای صحرایی ارائه شده است. در حال حاضر، روابط مبتنی بر ویژگیهای اولیۀ خاک مانند بافت، مادۀ آلی، ساختمان و نفوذپذیری بهصورت گستردهای استفاده شدهاند. بنابراین، در پژوهش حاضر از سه رابطۀ متداول شامل ویشمایر و اسمیت (1978)، رومکنز و همکارانش (1986) و توری و همکارانش (1997 و 2002) به‌ترتیب با علایم K1، K2 و K3 برای برآورد عامل فرسایش‌پذیری خاک در حوضۀ آبخیز شازند استفاده شد. به همین منظور، به نمونهبرداری صحرایی در 140 نقطه از حوضۀ آبخیز شازند با مساحت 1740 کیلومترمربع اقدام شد. حوضۀ آبخیز شازند خاک آهکی با مادۀ آلی کم و بافت متوسط دارد. در ادامه، آزمون تحلیل واریانس یکطرفه برای تحلیل نتایج K1، K2 و K3 تحت تأثیر طبقات مختلف شیب و ارتفاع و کاربریهای مختلف اراضی و روش کریجینگ برای تهیۀ الگوی مکانی آنها بهکار گرفته شد. نتایج به‌دست‌آمده از تحلیل واریانس یکطرفه بیان‌کنندۀ اختلاف معنادار K1، K2 و K3 تحت تأثیر طبقات شیب و ارتفاع (05/0 > P) و نبود اختلاف معنادار آنها تحت تأثیر کاربری اراضی (318/0 ≤ P) بود. همچنین، میانگین عامل فرسایش‌پذیری خاک برای سه رابطۀ یادشده به‌ترتیب برابر با 054/0، 039/0 و 035/0 t ha h ha-1 MJ-1 mm-1 محاسبه شد. | ||
| کلیدواژه‌ها | ||
| تخریب خاک؛ خاکهای آهکی؛ فرسایش‌پذیری؛ مقیاس حوضۀ آبخیز | ||
| عنوان مقاله [English] | ||
| Comparative Analysis of soil Erodibility Factor in Shazand Watershed | ||
| نویسندگان [English] | ||
| Mahboobeh Kiani Harchegani1؛ Seyed Hamidreza Sadeghi2؛ Samereh Falahatkar3 | ||
| 1Postdoctoral Fellow, Department of Watershed Management Engineering, Faculty of Natural Resources Tarbiat Modares University, Noor, Iran | ||
| 2Professor, Department of Watershed Management Engineering, Faculty of Natural Resources Tarbiat Modares University, Noor, Iran | ||
| 3Assistant Professor, Department of Environment Engineering, Faculty of Natural Resources Tarbiat Modares University, Noor, Iran | ||
| چکیده [English] | ||
| Soil erosion is a serious environmental, social and economic problem. It not only causes severe land degradation and soil loss, but also threatens the stability and health of the society and, in general, its sustainable development. Soil erosion is related to different soil characteristics, measurements and its calculations. The soil erodibility factor (K) is one of the important factors in determining soil erosion. Different methods have been developed to determine of K using empirical models or field measurements. Currently, widely used equations that estimate K, on the basis of soil basic properties, include soil texture, organic matter, structure, and permeability. Therefore, in this study, three commonly equations were used to estimate of K in Shazand watershed such as Wischmeier and Smith (1978), Romkens et al. (1986), Torri et al. (1997 and 2002) with K1, K2 and K3, respectively. In this regard, field sampling was done at 140 points of Shazand watershed with an area of 1740 km2. The Shazand watershed has limestone with low organic matter and medium texture. In the following, one-way ANOVA was used to analyze of K1, K2 and K3 results under the impact of different slope and elevation classes and different land uses, as well as Kriging's method for generation their spatial pattern. The results of one-way ANOVA showed that K1, K2 and K3 influenced by different slope and elevation classes with a significant difference (P< 0.05). But they had no significant difference (P ≤ 0.318) in different land use. Also, the average of K1, K2 and K3 was calculated to be 0.054, 0.039 and 0.035 t ha h ha-1 MJ-1 mm-1 respectively. | ||
| کلیدواژه‌ها [English] | ||
| Erodibility, Land degradation, Limestone soil, Watershed scale | ||
| مراجع | ||
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