بررسی اثر نوع کاربری اراضی بر تخلخل خاک با استفاده از پردازش تصویر

نویسندگان

1 استاد گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز

2 دانشجوی دکتری گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز

3 استادیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز

چکیده

این پژوهش به­منظور بررسی اثرات نوع کاربری اراضی بر تخلخل خاک در ایستگاه تحقیقات کشاورزی کرکج با استفاده از پردازش تصویر مقاطع نازک خاک انجام شد. آزمایشات با مطالعه پنج خاکرخ در پوشش­های گیاهی مختلف شامل باغ سیب، درختان سوزنی برگ، یونجه، کلزا و زمین بایر انجام و از برش­های نازک، 450 عکس با فرمت TIFF توسط دوربین متصل به میکروسکوپ تهیه و منافذ از کانی­ها با لام لاندا متمایز گردید. در یک آزمایش فاکتوریل با طرح کاملاً تصادفی (CRD)، نمونه­های دست نخورده خاک با سه تکرار از افق­های A یا Ap، Bw وC آماده و برش­های نازک خاک تهیه شده با میکروسکوپ پلاریزان مورد مطالعه قرار گرفتند. نتایج به­دست آمده نشان داد که مساحت کل منافذ در باغ سیب و سوزنی برگ بیش از کاربری­های یونجه و کلزا و زمین بایر بوده و این امر می­تواند در ارتباط با سیستم ریشه و ماده­ آلی در اراضی مذکور باشد. همچنین فراوانی ویژگی­هایی از قبیل درجه گردواری و استحکام منافذ در پوشش سوزنی برگ بیشتر از اراضی یونجه، کلزا و بایر می­باشد. در کاربری­های یونجه، کلزا و اراضی بایر بُعد فرکتال منفذ خاک (Dmp) و ذرات جامد خاک (Dms) به ترتیب به­طور معنی­داری کاهش و افزایش یافته است، لذا نتایج کمی و آماری بیان­گر تأثیر معنی­دار نوع کاربری اراضی بر منافذ و ریزساختار خاک می­باشد.   

کلیدواژه‌ها


عنوان مقاله [English]

Assessment of land use type effect on soil porosity by image processing

نویسندگان [English]

  • AA Jafarzadeh 1
  • M Norouzi 2
  • H Rezaei 3
1 Prof., Dept. of Soil Science and Engineering, Faculty of Agriculture, University of Tabriz, Iran
2 PhD students, Dept. of Soil Science, Faculty of Agriculture, University of Tabriz, Iran
3 Assistant Prof., Dept. of Soil Science and Engineering, Faculty of Agriculture, University of Tabriz, Iran
چکیده [English]

This research work carried out to investigate the effects of land use type on soil porosity by image analysis of soil thin sections in Karkaj Agriculture Research Station. Experiments were conducted by studying five soil profiles with different covers of apple and coniferous trees, alfalfa, rapeseed and bare land (no cultivation) and 450 TIFF format images from soil thin sections, were prepared by connected camera to microscope and pores were separated from minerals with the compensator Lambda plate. As a factorial trial with completely randomized design (CRD), undisturbed soil blocks were prepared with three replications from horizons of A or Ap, Bw and C and then soil thin sections were prepared and studied with a polarizing microscope. Obtained results indicated that total area of soil pores in apple and coniferous lands were greater than those in the utilized lands for alfalfa, rapeseed and bare one, that it can be related to root system and organic matter. Also maximum frequency of shape characteristics such as pores roundness and solidity observed in coniferous covered land were greater than those in alfalfa, rapeseed and bare lands. In alfalfa, rapeseed and bare lands the fractal dimension of the pore component (Dmp) and solid component (Dms) were significantly decreased and increased respectively. Therefore, the quantitative and statistical results revealed significant effects of the land use types on soil porosity and microstructure.

کلیدواژه‌ها [English]

  • Fractal dimension
  • Micromorphology
  • Microstructure
  • Roundness
  • Voids
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