Analysis on high spectral characteristics of degraded Seriphidium transiliense desert grassland.
The reflectance spectra of degraded Seriphidium transiliense desert grassland at different stages were measured in the Tianshan Mountains of Xinjiang using a portable spectrometer SVC HR-768. The plant community of Seriphidium transiliense desert grassland, was composed of Seriphidium transiliense (decreasing species), Petrosimonia sibirica (increasing species) and Polygonum aviculare (invasive species). Results showed that the spectral reflectivity observed in the near-infrared band was ordered as bare soil > Polygonum aviculare > Seriphidium transiliense > Petrosimonia sibirica. The reflectance characteristic of the plant community was little affected by the spectral reflectivity of Polygonum aviculare, whereas the reflectance characteristic of the plant community was mainly affected by the spectral reflectivity of Seriphidium transiliense and Petrosimonia sibirica. The reflectance characteristic was positively correlated to the importance value of dominant species. The spectral reflectivity of moderately degraded grassland observed inside fence was greater than outside fence, whereas the spectral reflectivity of heavily and extremely degraded grassland outside fence was greater than inside fence.