Semi-variogram Problems in Soil Spatial Variability

This paper briefly reviews the study of soil spatial variability. Based on the theory of geostatistics and the research experience in soil spatial variability, the problem of semi-variogram which is a key to study soil spatial variability was discussed，including its basic hypothesis, sampling, modeling and statistic test. Some suggestions were given for determining semi-variogram model，such as on the condition of satisfying sample size: checking the data whether they correspond to the intrinsic hypothesis: enhancing the confidence for every estimating point， choosing the safety model as semivariogram model and testing statistically to semi-variogram model.