Analysis of the effects of salt content on soil spectral characteristics

The spectral reflectance features of saline soils changing with salt content and the concentrations of salt ions were studied based on microbial remediation process for the salinized soil. In response to the variations of soil salt content during the remediation process, the spectral response range of salt ions and associated inversion models were analyzed and constructed by adjusting sampling intervals. The results showed there were a positive correlation between the degree of salinity of soil including the salt content of soils and the concentrations of ions contained in salts and the corresponding spectral reflectance of soils although the sensitivity levels varied with different salt ions. The sensitive spectral band of salt content, the concentrations of Mg2+, Cl- and Na+ was respectively 1447-1608nm, 1350-1461nm, 1336-1461nm and 1471-1561nm, and all R2 of their associated inversion models were greater than 0.86.