The Study of Salt-affected Soils in the Yellow River Delta Based on Remote Sensing
黄河三角洲盐碱地遥感调查研究

Salinization is the major land degradation processes in arid and semi-arid regions. In order to prevent further deterioration of salt-affected soils and make agriculture development in a sustainable way, up-to-date and reliable information on the nature, extent, magnitude and spatial distribution of these soils is of paramount importance. This study was carried out to extract such information using Landsat TM data. On the basis of spectral response pattern of salt-affected soils, the relationship between salt-affected soil and image characteristics established during the field investigation and soil sample data, four categories of salt-affected land were delineated, namely, extremely saline (14477.67 hm\ 2), strongly saline (52086.33hm\ 2), moderately saline (86699.61hm\ 2), and lightly saline (2150017hm\ 2). Besides these salt-affected soils, other categories such as water bodies, tidal flat, forest, grass land, reed beds, residential area were also mapped. All these will provide scientific guideline for regional land amelioration and agriculture sustainable development.