Abstract:

Soil salinization is one of the most important eco-environmental problems constraining the vegetation growth in the Yinchuan plain. It is the first obstruction for the regional agricultural production. Based on the remote sensing data, surface soil salt and groundwater table data, this paper studied the relationships between the soil salinization and the vegetation, groundwater depth in Yinchuan plain. The results indicated that the NDVI(normalized difference vegetation index) decreased with the increase of surface soil salt contents; and the vegetation growth is well developed as the surface soil salt content is smaller than 3 g/kg. The vegetation mainly grows in the area with no salinization or slight salinization;little vegetation grows in the area with moderate salinization and serious salinization. In dry seasons, the most serious salinization occurs when the groundwater depth is 1.5 m and the salinization is more serious as the groundwater depth is between 1 and 3 m.

Key words: soil salinization, vegetation growing, MODIS NDVI, groundwater depth, Yinchuan plain