تأثیرپذیری نتایج روش ژئوپدولوژی از موقعیت منطقه نمونه در نقشه برداری خاک(مطالعه موردی: منطقه میانه، استان آذربایجان شرقی)

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی دوره دکتری گروه خاک‎شناسی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران.

2 استاد گروه خاک‌شناسی دانشگاه تهران و دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران.

3 استادیار گروه خاک‌شناسی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران.

چکیده

یکی از روش­های سیستماتیک برای تجزیه و تحلیل سطوح ژئومرفیک در نقشه­برداری خاک که عملیات صحرایی را عمدتاً بر مبنای کار در منطقه نمونه پایه­ریزی می­کند، روش ژئوپدولوژی می­باشد. با توجه به نامشخص بودن میزان دقت و صحت نقشه­های ایجاد شده به روش ژئوپدولوژی در مقیاس­های بزرگ، این تحقیق با هدف بررسی موقعیت منطقه نمونه به منظور تعیین قابلیت تعمیم­ نتایج حاصل از روش ژئوپدولوژی برای اشکال اراضی مشابه، در منطقه میانه انجام شد. پس از تهیه نقشه تفسیری اولیه روی عکس­های هوایی با مقیاس 1:20000، با   توجه به موقعیت­های مختلف واحدHPu211 که بیشترین مساحت از محدوده مطالعاتی را در بر می­گرفت، منطقه نمونه در سه موقعیت مختلف در نظر گرفته شد و تعداد پنج پروفیل خاک با فواصل تقریبی 150 متر در هر کدام از موقعیت­های سه­گانه این واحد، و در مجموع 15 پروفیل خاک تشریح و نمونه­برداری شدند. میزان قابلیت تعمیم­ نتایج روش ژئوپدولوژی برای واحد مزبور، از طریق حفر سه پروفیل خاک دیگر در یک واحد مشابه موجود در خارج از منطقه­ نمونه (منطقه تعمیم) انجام شد و در مجموع نه پروفیل خاک مورد بررسی قرار گرفت. نقشه خاک در قالب مطالعات خاک­شناسی رده دوم نهایی گردید. نتایج نشان داد که تغییر موقعیت منطقه نمونه، تفاوت‎های تاکسونومیکی را در سطوح مختلف (راسته، زیرگروه و یا خانواده خاک) و نوع واحد نقشه (کمپلکس و خاک­ مجموعه همسان) برای واحد HPu211 باعث شده است. بنابراین، به منظور افزایش دقت نتایج روش ژئوپدولوژی، استفاده از فازهای لندفرم­ها و نیز تعیین حالت (فاز) خانواده خاک و یا حالت سری خاک برای هر یک از حالت­های لندفرم توصیه می­شود.

کلیدواژه‌ها


عنوان مقاله [English]

Influence of sample area location on geopedology approach results in soil mapping: case study of Miyaneh area, Azarbayejan-e-Sharghi province

نویسندگان [English]

  • Naser Nazari 1
  • Shahla Mahmoodi 2
  • Mohammad Hasan Masihabadi 3
1 . Ph.D. Student, Department of Soil Science, Science and Research Branch, Islamic Azad University of Tehran, Tehran, Iran.
2 Prof. and Assistant Prof., respectively, Science and Research Branch, Islamic Azad University of Tehran, Tehran, Iran.
3 Prof. and Assistant Prof., respectively, Science and Research Branch, Islamic Azad University of Tehran, Tehran, Iran.
چکیده [English]

Geopedology allows a systematic approach in geomorphic analysis for soil mapping that extrapolates the results obtained in sample areas up to similar units in the field operations.  Due to the unknown accuracy of the maps created by geopedologiy approach in the large scales, this paper examines the location of sample area in order to determine the amount of credibility for generalization of geopedological approach results for similar landforms in Miyaneh region, Azarbayejan­-­e­-­Sharghi province. After the initial interpretation of the study area on aerial photos with scale of 1:20000, a geomorphic unit that encompassed the maximum surface of the sample area (and also the study area namely Pi122) was selected and was surveyed. The sample area was designed in three different locations and five soil profile intervals of approximately 150 m in this unit (a total of 15 profiles), were excavated, described and sampled. The credibility of generalization for geopedological approach results for the studied unit was tested by comparison with three profiles in a similar unit (a total of nine profiles) outside the sample area, named the validation area. This soil map completed in the framework of second-order soil surveys. The results showed that change of sample area location resulted in differences in taxonomic levels (order, subgroup, and soil family) and map unit types (complex and consociation) for HPu211 unit. Therefore,  in  order to increase the accuracy of the geopedological results, the use of landform phases and also phases of soil families and­/or series for each landform phases is recommended.

کلیدواژه‌ها [English]

  • geomorphic surfaces
  • field operations
  • generalization area
  • soil map
  • soil survey
  • landform
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