| The hyperspectral characteristics of four soil types (Light chesthnut soil, Cold calcic soil, Calcic chernozem, Gypsum gray brown desert soil) in North Xinjiang and their relationship with soil organic matter content (SOM) were studied. The results showed that the spectral reflectance of Calcic chernozem was significantly lower than other soil types. Negative correlation between the spectral reflectance and SOM was detected as SOM was higher than 14 g·kg-1. By contrast, positive correlation existed with low SOM (<8 g·kg-1). Correlation analysis of spectrum reflectance with SOM indicated that SOM correlated with the spectrum reflectance in 593.6 nm band, i
n 661 nm band by removal of the envelope of reflectance, and in 547.4 nm band through first order differential of reflectance. In addition, the prediction accuracy of the first order differential was relatively high, and thus can be used in the estimation SOM of mainly soil types in North Xinjiang. |