The Analysis of Characteristic and Spatial Variability for Soil Organic Matter and Organic Carbon around Qinghai Lake

摘要

The use of geostatistics to explore the spatial distribution and variability of soil properties has become an important tool to recognize soil properties. In this paper, we combined actual field sampling data with geostatistics to study the characteristic and spatial variability of soil organic matter and organic carbon content around Qinghai Lake. The results showed that the mean content of soil organic carbon is 5.95 ± 3.40%, and organic matter is 3.45 ± 1.97%, both are low. The variogram model of semi-variance function graph showed the models of soil organic carbon and matter are the exponential model. Isotropic ratio of nugget to sill of soil organic carbon and organic matter are 82.9% and 83%, both variable range are 9300m,all are in the range, here exists a correlation between organic carbon and organic matter content in the space. Fractal dimension can exhibit the higher spatial heterogeneity of soil organic carbon and organic matter content around Qinghai Lake. Anisotropy semi-variance analysis reveals that there does not exist any anisotropy structural characteristics of soil organic carbon and organic matter content in different directions in the study area; but there is spatial variability in the east-west as for organic matter content, while variability is very small in the other directions.