برآورد ظرفیت تبادل کاتیونی خاک با استفاده از طیف‌سنجی بازتابی

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی جنگل، دانشگاه تهران، کرج، ایران.

2 دانشیار، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران.

3 دانشیار، دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران.

4 دانشیار، گروه خاک‌شناسی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران.

5 استاد، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران.

6 دانشجوی دکتری سنجش از دور و GIS، دانشکده جغرافیا، دانشگاه تهران، تهران، ایران.

چکیده

در این پژوهش قابلیت بازتاب طیفی خاک به­منظور برآورد مقدار CEC خاک بررسی شد. به همین منظور تعداد 45 نمونه خاک از بخش نم­خانه جنگل خیرود جمع‌آوری و بازتاب طیفی آن­ها در محدوده 2500-350 نانومتر اندازه­گیری و ارتباط آن با مقادیر CEC اندازه‌گیری شده مورد بررسی قرار گرفت. علاوه بر روش رگرسیون حداقل مربعات جزئی (Partial Least Squares Regression: PLSR)، دو گروه از شاخص­های باریک­باند خاک (RI، DI) نیز برای برآورد CEC در دو حالت طیف بازتابندگی و مشتق آن استفاده شدند و سپس مورد مقایسه قرار گرفتند. نتایج این بررسی نشان داد که به‌طورکلی شاخص­های باریک­باند ارتباط قوی­تری با CEC نسبت به روش PLSR دارند و در حالت مشتق اول شاخص DI بیشترین همبستگی (01/5= RMSE، 82/0= R2) نسبت به دیگر حالت­های شاخص­ها مشاهده شد. در روش PLSR طیف خام با CEC ارتباط قوی­تری نسبت به مشتق اول نشان داد، درحالی‌که در استفاده از روش شاخص­های باریک باند، مشتق اول و CEC ارتباط قوی­تری نسبت به طیف خام نشان دادند؛ بنابراین با توجه به اینکه بین CEC و بازتاب طیفی خاک ارتباط بسیار قوی وجود دارد، می­توان از طیف‌سنجی بازتابی به‌عنوان روشی غیرمخرب، سریع، آسان و کم‌هزینه برای برآورد CEC استفاده کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Estimate of soil Cation Exchange Capacity using reflectance spectrometry

نویسندگان [English]

  • Fatemeh Mousavi 1
  • EHsan Abdi 2
  • Abbas Ghalandarzadeh 3
  • Hossein Ali Bahrami 4
  • Baris Majnounian 5
  • Saham Mirzaei 6
1 Ph.D. Student of Forest Engineering, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran.
2 Associate Professor, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran.
3 Associate Professor, Department of Civil Engineering, University of Tehran, Tehran, I.R. Iran.
4 Associate Professor, Department of Soil Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, I.R. Iran.
5 Professor, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran.
6 Ph.D. Student of RS & GIS, Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, I.R. Iran.
چکیده [English]

CEC is the most important soil engineering properties used to determine the swelling potential of soil. Measuring CEC of soil is difficult, time-consuming, costly and consuming of dangerous chemical materials. In this study the ability of spectral reflectance to estimate the amount of CEC were investigated. So 45 soil samples were collected from Namkhaneh series of Kheyrood kenar Forest and their reflectance were measured in the range 350-2500 nm in dark room. Then the relationship between CEC and reflectance and first derivative of reflectance were analyzed by single band Pearson correlation, PLSR and two groups of narrowband soil indices (RI, DI). The results of this study showed that narrowband indices have stronger relationship than PLSR and the DI index in case first derivative have highest correlation (R2=0.82, RMSE=5.01). In the PLSR method between reflectance and CEC strong relationship was observed while the indices of first derivation reflectance and CEC have stronger relationship than row reflectance. So reflectance can be as a nondestructive, fast, easy and Cost effective method to estimate the CEC.

کلیدواژه‌ها [English]

  • reflection
  • Narrowband soil indices
  • Reflectance
  • PLSR
  • CEC
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