Cartografía mediante imágenes landsat de suelos salinos en la tierra de medina (Valladolid)

Abstract

The main goal of this study is the mapping of saline soils (solonchaks, solonetzs and luvisols with salic phases) in « Tierra de Medina » (Valladolid) using images of the TM and ETM sensors of the Landsat satellites. The spectral signatures of these soils show very high digital values, which allows to differentiate them from other types of soils and superficial covers. The highest values correspond to those which have salt efflorescences and the lowest values to soils affected by hydromorphic processes. The images obtained with the NDVI do not allow a clear discrimination of saline soils, but they allow to interpret the changes in their use. In these soils the values of NDVI are very low, due to their scarce vegetation. There is a remarkable vegetation reduction between years 1987 and 2001, which implies a structure deterioration and a great loss of vegetal cover; many of soils affected by salinization have not been cultivated any more.