Spatial Variability of Nutrient Properties in Soil of Jilin Middle Plain

摘要

Spatial distribution of soil middle-elements and microelements in the middle plain of Jilin province were investigated using geostatistics and geographic information system (GIS)techniques.With various processing methods,including logarithmic transformation,excluding outliers and Box-Cox transformation,the available Ca,Mg,B,Cu,and Zn contents were evaluated with normal distribution.The result shows that Box-Cox transformation is applied in order to achieve normality in the data sets of available Ca,Mg,Cu,and Zn while excluding outliers were employed in the data set of available B to dampen the effect of outliers.Geostatistical analyses were carried out,including calculation of experimental variograms and model fitting,and then the distribution patterns of these soil nutrients elements were plotted.Semivariogram analysis showed that these soil nutrient elements were moderately spatially dependent in a given range.