نوع مقاله : مقاله پژوهشی
نویسندگان
1 عضو هیات علمی دانشگاه
2 دانشگاه تهران
چکیده
کلیدواژهها
عنوان مقاله [English]
The purpose of this study is to preparation soil properties map using geostatistical methods in Taleghan Miany rangeland. In order to, the units sampling was prepared by the combining of slope, aspect, elevation and geological maps of the area. In each unit, sampling was done by the systematic –random method and was stationed 3 transects 150 meters. Overall, Number of 30 soil samples were collected from a depth of 0-30 cm. Maps of the soil variables that including of sand, clay, silt, lime, pH, electrical conductivity and organic matter variables was used with point kriging, block kriging, Inverse Distance Weighting and Normal Distance Weighting methods in the GS+ and GIS software environment. We was used a cross-validation method using the Mean Bias Error, Mean absolute Error and Root Mean Squar Error to assess the accuracy of the methods. The results showed that, there is very little difference in values accuracy and error between two method of block kriging and point kriging of the silt, sand, lime, clay and pH variables, And are more suitable than other methods for the estimating these variables. Also, high accuracy was related to EC and OM maps which was obtained by the method IDW. Error values obtained for EC variable the least amount of MAE (0.028), MBE (-0.006), RMSE (0.038) and for OM variable the least amount of error MAE (0. 59), MBE (-0.13) and RMSE (0.71). NDW method has the highest estimation error for all variables.
کلیدواژهها [English]
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