پیش‌بینی برخی ویژگی‌های خاک به روش طیف‌سنجی مرئی– مادون قرمز نزدیک در منطقه بردسیر کرمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان

2 استاد گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان

3 دانش آموخته دکتری، گروه خاکشناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

4 استاد گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه شهید باهنرکرمان

چکیده

تکنیک طیف‌سنجی مرئی- مادون قرمز نزدیک روشی غیر‌مخرب، سریع، ارزان و دارای حداقل آماده‌سازی نمونه به منظور برآورد خصوصیات خاک و بدون ضرر برای محیط زیست محسوب می‌گردد. با توجه به اینکه مطالعات اندکی در رابطه با کاربرد این روش در تعیین ویژگی­های خاک­های کشورمان انجام شده است، این مطالعه با هدف ارزیابی روش طیف‌سنجی انعکاسی در برآورد برخی خصوصیات خاک در منطقه بردسیر در استان کرمان انجام شد. تعداد 150 نمونه مرکب خاک سطحی، از چهار کاربری مختلف از عمق 20-0 سانتی‌متری جمع‌آوری گردید و مقادیر کربن آلی، درصد‌آهک، درصد شن، درصد سیلت و درصد رس وpH  خاک با روش‌های استاندارد آزمایشگاهی اندازه‌گیری شد. طیف‌سنجی انعکاسی نمونه‌های هوا خشک شده تحت شرایط کنترل شده آزمایشگاهی، با استفاده از دستگاه طیف­سنج زمینی در محدوده طول موج 2500-350 نانومتر انجام شد. پس از ثبت طیف‌ها، انواع روش‌های پیش‌پردازش مورد ارزیابی قرار گرفت. واسنجی بین داده‌های طیفی و آزمایشگاهی به روش اعتبار‌سنجی متقابل با استفاده از مدل رگرسیون حداقل مربعات جزئی انجام شد. نتایج نشان داد که مقادیر ضریب تبیین برای کربن آلی، آهک، درصد شن، درصد سیلت، درصد رس و pH به ترتیب 68/0، 62/0، 64/0، 66/0، 3/0 و 01/0 می‌باشد. با توجه به مقادیر RPD(Ratio of Prediction to Deviation)، پیش‌بینی مدل برای درصد شن و سیلت کاملاً مناسب برای کربن آلی و آهک مناسب و برای درصد رس و pH ضعیف می‌باشد. بهترین روش پیش‌پردازش برای کربن آلی متغیر نرمال استاندارد(SNV)  و برای آهک، درصد شن و درصد سیلت روش مشتق اول به همراه فیلتر ساویتزکی و گلای تعیین گردید. نتایج بر قابلیت تکنیک طیف‌سنجی مرئی- مادون قرمز در تخمین مکانی چندین ویژگی خاک به صورت همزمان، دلالت دارد. لذا این روش می‌تواند به عنوان روشی جایگزین برای روش‌های مرسوم آزمایشگاهی در تعیین برخی ویژگی‌های خاک مطرح باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Prediction of Selected Soil Properties Using Visible and Near Infrared Spectroscopy in Bardsir Area, Kerman Province

نویسندگان [English]

  • N. Rasooli 1
  • M. H. Farpoor 2
  • F. Khayamim 3
  • H. Ranjbar 4
1 PhD, Student, Department of Soil Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran
2 Professor, Dept. of Soil Science, Faculty of Agriculture, Shahid Bahonar University of Kerman; Kerman, Iran
3 PhD, Dept. of Soil Science, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran
4 Professor, Dept. of Mining Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
چکیده [English]

Soil spectroscopy in the visible and near infrared (Vis-NIR) range has widely been used as a rapid, cost-effective, and non-destructive technique to predict soil properties. Since little data is available about soil properties determined by using this technique, the present research was carried out to evaluate the efficiency of Vis-NIR spectroscopy to estimate several soil properties in Bardsir area, Kerman Province. About 150 complex surface soil samples were collected from four different land uses from depth of 0-20 cm. Soil organic carbon, equivalent calcium carbonate, pH, and the amount of silt, clay and sand particles were measured by routine laboratory methods. Reflectance spectra were obtained from air-dried samples under controlled laboratory conditions using an ASD FieldSpec Pro spectroradiometer in 350-2500 nm wavelength range. Partial least squares regression was used for calibration of spectral and laboratory data using cross validation. Coefficient of variation for organic carbon, equivalent calcium carbonate, sand, silt, clay, and pH values were 0.68, 0.62, 0.64, 0.66, 0.3, and 0.01, respectively. Based on RPD values (Ratio of Prediction to Deviation), the precision of the prediction model for sand and silt contents was quite suitable, and for organic carbon and equivalent calcium carbonate it was suitable. [H1] However, the predictions of the model for clay content and pH were poor.Furthermore, standard normal variate (SNV) was the best pre-processing method to predict organic carbon, whereas, first derivative with SG smoothing (FD-SG) showed better estimation for carbonate, sand, and silt. Consequently, Vis-NIR spectroscopy is capable of predicting several soil properties at the same time. As the model accuracy is acceptable, it has the potential to substitute conventional laboratory analyses of selected soil properties.



 [H1]این تغییرات با توجه به متن فارسی انجام شد.

کلیدواژه‌ها [English]

  • Validation
  • Spectral pre-processing
  • Partial least-squares regression
  • Reflective spectroscopy
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