ارتقاي كيفيت تخمين خصوصيات سطحي خاك از طريق تركيب نقشه هاي مرسوم خاك با كريجينگ

Improving the Estimation of Soil Surface Properties Using Combination of Conventional Soil Map With Kriging

Accuracy of estimations made by conventional soil maps is 10\\ because they do not take in account the spatial variability of soil properties. ln this study, a new idea in order to improve the quality and accuracy of prediet ions of a conventional soil map is introduced. To do this, a detailed soil map of Farrokhshahr area located in Chaharmahal and Bakhtiari province was combined with kriging maps of seven soil surface properties including percentage of CaCO " clay, silt, sand, gravel, organic matter and the thickness of A horizon. The results showed a considerable bias in the predictions made with the conventional soil map in comparison with kriging and combined methods, According to mean square error (MSE) index, soil map predictions were also less accurate than the two other predictors. Mean absolute error (MAE) index indicated that predictions or the combined procedure were mostly unbiased and accurate although some bias and accuracy differences found with two other predictors, particularly kriging, for some soil properties were not very large. In situations where soil spatial variability lies somewhere between abrupt and gradual changes and also lack of alternative methods. the \\ cighicd linear combination of kriging-soil map procedure can be used as a valuable tool tor improving the quality of conventional soil maps.