Matching relationship between land salinity and utilization based on the synergy of OLI and ground measurements

Abstract

Timely and accurate grasp of land salinization status and its matching relationship with land use is the basis for scientific improvement of saline land and rational land use. The current land use types of Shouguang City on the south coast of the Bohai Sea were obtained based on Landsat 8 OLI multispectral images using supervised classification. And the spatial distribution map of land salinization was obtained by IDW interpolation. By superimposed analysis of the current land use types and the spatial distribution of salinization, the information of salinization degree was obtained. The matching relationship between salinization and land use was analyzed from both quantitative and spatial aspects. The results show that OLI multispectral image and filed survey can improve the extraction accuracy of land types and salinization degree information. The distribution of salinized land in Shouguang City has prominent regional characteristics, with non-saline, mild, moderate, severe, and saline soil distributed in a pattern of “large concentration and small insertion” from south to north. The spatial consistency of land use and salinization in Shouguang is remarkable, forming spatial characteristics of “vegetable in the south, grain and cotton in the middle, and fishery and salt in the north”. However, no matter from space or quantity, the land use and salinization in Shouguang City have the problem of “overall match, local mismatch”. It is suggested to take differentiated measures to regulate land use according to the current situation of distribution characteristics of land salinization and utilization.