نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشآموخته کارشناسی ارشد خاکشناسی دانشکده کشاورزی دانشگاه صنعتی اصفهان
2 استاد گروه خاکشناسی دانشکده کشاورزی دانشگاه صنعتی اصفهان
3 دانشیار خاکشناسی، بخش تحقیقات خاک و آب، مرکز تحقیقات، آموزش کشاورزی و منابع طبیعی استان اصفهان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اصفهان، ایران
4 دانشیار گروه کنترل دانشکده برق و کامپیوتر دانشگاه صنعتی اصفهان
5 دانشآموخته دکتری خاکشناسی دانشکده کشاورزی دانشگاه صنعتی اصفهان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This research was carried out to compare the methods of determining the spatial distribution of soil organic carbon and nitrogen on 50,000 hectares of Lenjanat area in Isfahan province, central Iran. The spatial distribution of elements was determined by Ordinary Kriging, Inverse Distance Weighting, and Spline Tension interpolation methods. The results indicated that there was an average spatial structure in the variables. Empirical variograms showed that there was no specific anisotropy process for variables. In order to determine the accuracy of the estimation of interpolation methods, the standard data (150 data for each variable) and statistical criteria including Mean Estimation Error (MEE), Mean Square Estimation Error (MSEE), Root Mean Square Error (RMSE), relative Error (Er) and Pearson correlation coefficient (r) were used. Despite the high spatial variability of the parameters, the results indicate the accuracy of the estimated values by means of interpolation methods. For soil organic carbon in the study area, Ordinary Kriging and Spline Tension interpolation methods with lower error (MEE= 0.007, MSEE= 0.09, RMSE= 0.3, Er= 0.32 and r= 0.73) were more accurate compared with the Inverse Distance Weighting interpolation method (MEE= 0.009, MSEE= 0.096, RMSE= 0.31, Er= 0.31 and r= 0.71). Also, Ordinary Kriging and Inverse Distance Weighting interpolation methods with a lower error (MEE= 0.003, MSEE= 0.0006, RMSE= 0.025, Er= 0.296 and r= 0.8), compared with Spline Tension interpolation method (MEE= 0.0017, MSEE= 0.0007, RMSE= 0.026, Er= 0.301 and r= 0.78) had more accurate estimation of soil nitrogen in the region.
کلیدواژهها [English]