Remote Sensing Monitoring of Soil Salinization Based on SI-Brightness Feature Space and Drivers Analysis: A Case Study of Surface Mining Areas in Semi-Arid Steppe

The real-time monitoring and driving force research of soil salinization in semi-arid grassland are great significance for regional local ecological environment protection, management, sustainable development. We selected a typical “mine-town-agriculture-pastureland-industry” interlaced ecologically fragile area as the study area. Based on method SI (Salinization Index)-Brightness feature space, we constructed new spectral index named Semi-Arid Steppe Salinization Index (SASSI), which is more suitable remote sensing steppe. geodetector was used to analyze forces temporal-spatial changes salinization. results indicated that: (1) SASSI presented high correlation with surface salt content (R 2 = 0.7698), made full use multi-dimensional information. can reflect status soil. indicator calculation simple easy obtain, conducive quantitative analysis (2) factors affecting spatial distribution change were water, mines, town, agriculture, industry, road network, elevation. salinized areas mainly distributed around wetlands Xilin River Basin, mining landscapes, town landscapes. (3) total increased from 32.03 km 2002 150.46 2017. rapidly 2005 2014, but growth rate slowed down after 2014. located marsh wetland 2002, however had spread whole This provides references impact land use, topography other natural