نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی‌ارشد دانشگاه تبریز

2 استادیار گروه علوم خاک دانشگاه تبریز

چکیده

گنجایش تبادل کاتیونی یکی از ویژگی‌های شیمیایی خاک است که تاثیر عمده‌ای بر سایر خواص شیمیایی، فیزیکی، حاصلخیزی و بیولوژیکی خاک دارد. در این تحقیق، کارآیی برخی روش‌های ارائه توابع انتقالی نظیر روش رگرسیونی، روش فازی و روش فازی-ژنتیک در برآورد گنجایش تبادل کاتیونی براساس خصوصیات زودیافت خاک مورد ارزیابی قرار گرفته است. برای این منظور 770 نمونه از پایگاه اطلاعات داده‌های خاک اروپا (IES) استخراج گردید. سپس مدل‌های رگرسیون خطی چند متغیره، فازی و فازی-ژنتیک به­منظور توسعه توابع انتقالی برای تخمین CEC خاک با استفاده از خصوصیات زودیافت رس و کربن آلی خاک، استفاده شد. به­منظور ارزیابی مدل‌ها از معیارهای ضریب تبین (R2)، ریشه میانگین مربع خطا (RMSE) و میانگین مطلق خطا (MAE) استفاده شد. مقادیر R2، RMSE و MAE برای مدل رگرسیون خطی به­ترتیب برابر 72/0، cmolc kg-1 42/7 و cmolc kg-1  13/9، و برای مدل فازی به­ترتیب 78/0، cmolc kg-1 44/5 و cmolc kg-1 32/4 به­دست آمد در حالی که این پارامترها برای مدل فازی-ژنتیک به­ترتیب 84/0، cmolc kg-1 7/4 و cmolc kg-1 57/3 بود. این نتایج نشان داد که مدل فازی-ژنتیک دقت بیشتری نسبت به مدل‌ فازی، آن هم دقت بیشتری نسبت به مدل رگرسیون خطی در برآورد گنجایش تبادل کاتیونی خاک دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of linear regression, Fuzzy and Fuzzy-genetic models to predict soil cation exchange capacity

نویسندگان [English]

  • Habib Palizvanzand 1
  • Abbas Ahmadi 2

چکیده [English]

Cation exchange capacity (CEC) is one of the most important soil chemical properties that affects other chemical, physical, and biological soil properties and fertility. In this study, performance of some procedures such as regression, Fuzzy and Fuzzy-genetic approaches in estimation of soil CEC has been investigated. Consequently, the required data of 770 samples from the Europe database (IES) was extracted. Then multiple linear regression, Fuzzy and Fuzzy-genetic approaches were used for development of pedotransfer functions for estimating of soil CEC. The coefficient of determination (R2), root mean square error (RMSE) and mean absolute error (MAE) criteria were used for evaluation of the proposed models. The values of R2, RMSE and MAE obtained for the linear regression model 0.72, 7.42 cmolc kg-1 and 9.13 cmolc kg-1, for Fuzzy model, 0.78, 5.44 cmolc kg-1 and 4.32 cmolc kg-1, for Fuzzy-genetic model 0.84, 4.7 cmolc kg-1 and 3.57 cmolc kg-1, respectively. These results indicated that the Fuzzy-genetic CEC model is more accurate than Fuzzy model, and Fuzzy model is more accurate than regression CEC model.

کلیدواژه‌ها [English]

  • Clay
  • Fuzzy rules
  • Organic carbon
  • Pedotransfer functions
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