نوع مقاله : مقاله پژوهشی

نویسنده

دانشگاه محقق اردبیلی

چکیده

در این پژوهش، دو روش صحرایی اندازه‌گیری هدایت هیدرولیکی اشباع با نفوذسنج گلف و نفوذسنج مکشی در مزرعه‌ای با خاک لومی-‌شنی در دانشکدۀ کشاورزی مغان مقایسه شدند. آزمایش‌های گلف با دستگاه نفوذ سنج گلف مدل k2800 اجرا شد. به این منظور، 15 چاهک با شعاع 5 سانتی‌متر و عمق 25 سانتی متر درشبکه 2×2 متر حفر و دبی خروجی از دستگاه در بار آبی 5 و10 سانتی‌متر اندازه‌گیری شد. آزمایش در قالب طرح کاملاً تصادفی با چهارتیمار و 15 تکرار دنبال شد. در روش نفوذ­سنج مکشی، آزمایش‌ها در همان شبکه و در مکش‌های 5 ،10 و 15 (سانتی‌متر) اجرا شد. میانگین هدایت هیدرولیکی برای روش نفوذسنج مکشی، گلف با بار آبی 5، گلف با بار آبی 10 (سانتی‌متر)، و آنالیز دو­عمقی گلف به­ترتیب برابر 7، 3، 4، و 6/2 (سانتی‌متر بر ساعت) به­­دست آمد. نتایج آزمون فیشر نشان داده است که روش‌های مختلف در یک گروه قرار گرفته‌اند و تفاوت معنی‌داری در سطح یک درصد با یکدیگر ندارند.میانگین مقادیر به­­دست آمده برای عکس طول درشت مویینگی خاک برابر 0/07(‌بر سانتی‌متر) است و با افزایش میزان هدایت هیدرولیکی اشباع خاک، روند افزایشی آن در خاک دیده شد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of Guelph permeameter and Tension Disc Infiltrometer Methods for Measurement Soil Saturated Hydraulic Conductivity

نویسنده [English]

  • yaser hoseini

Moghan College of Agriculture and Natural resources - University of Mohaghegh Ardabili

چکیده [English]

In this study two methods of measuring saturated hydraulic conductivity namely: Guelph permeameter and Tension Disc Infiltrometer were compared in the experimental  field of Moghan Faculty of Agriculture containing Sandy-loam soil texture . Guelph experiments were performed by using Guelph penetrometer model k2800. In this regard, 15 boreholes each with 5 cm diameter and 25 cm depth were drilled in a grid of  2×2 m and discharge was measured  at the hydraulic heads of 5 and 10 cm. .. Experiments were performed based on completely randomized design with 4 treatments and 15 replicates. Also in the Tension Disc Infiltrometer, determination of saturated hydraulic conductivity was performed on   the same grid  with 5, 10, 15 cm suction heads. The average hydraulic conductivity obtained for Tension Disc Infiltrometer, Guelph permeameter in 5,10 cm of hydraulic heads and Guelph two depths analysis was found to be 7, 3, 4, 6.2 cm per hour, respectively. Results of Fisher test  revealed that all methods are classified in a group and not significantly different from each other at the 0.01 level and beyond, . Average values for the inverse of macroscopic capillary length parameter was obtained to be 0.07 cm-1 and as the value of saturated soil hydraulic conductivity increased , an increase in the value of inverse macroscopic capillary length parameter was observed.

کلیدواژه‌ها [English]

  • Depth Analysis Hydraulic head
  • Length One
  • Macroscopic Capillary
  • Matric potential
  • Two Depth Analysis
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