Abstract:

The objective of this study was to explore the spatial variability of tillage-layer soil organic matter content, and to guide the evaluation and management of soil fertility, so as to achieve the sustainable use of land resources. Through sample gathering and analysis of soil samples, the organic matter content of tillage-layer soil samples were determined, and the spatial variability of soil organic matter was studied based on Kriging method handled by ArcGIS, and selected the optimal Kriging interpolation model. The results showed that the optimal Kriging interpolation model of tillage-layer soil organic matter in Wendeng city was Tetraspherical model, and the value of C0/sill was 0.86. This showed that the spatial correlation of tillage-layer soil organic matter is very weak and was affected by human activities, such as tillage, the application of fertilizers and cropping system. These factors made the spatial correlation of tillage-layer soil organic matter weaken, and gradually became homogenization. The organic matter content of tillage-layer soil was low, so the management of tillage should be changed in order to achieve the sustainable use of arable land resources.