Advances in Earth Science
• Articles •
Zhang Kai,Guo Ni,Wang Runyuan,Si Jianhua,Wang Xiaoping. Research on Spectral Reflectance Characteristics for Desert Meadow of Northwest China[J]. Advances in Earth Science, 2006, 21(10): 1063-1069.
Taking Anxi desert grassland that locates in northwestern arid zone as experimental area of the observation, ground spectral reflectance of the saline lowland meadow, extremely arid desert meadow and desert shrubs were determined. The paper analyzes the spectral reflectance common characteristics and red edge parameter characteristics of main desert meadow vegetations. At the same time, the major interior reasons and influencing factors that lead to the difference of grassland spectral characteristics are discussed. The results show that canopy spectral reflectance has a marked difference for different desert meadow types in the near infrared waves because the internal structures of leaf laminae change greatly.The canopy spectral reflectance of the same vegetation has relation to their growing status. Influenced by sandy land backgrounds, in the near infrared waves, the canopy spectral reflectance of desert meadow is clearly smaller than the leaf spectral reflectance. There are “double peak” phenomena for the red edge of canopy spectra in desert meadow, and the maximum value of red edge parameters of different vegetative types is the biggest for sandy land vegetation and the smallest for desert vegetation. Research on spectral reflectance characteristics for desert meadow of Anxi plays an important role in the research of physical chemistry performances, remote sensing retrieval, classification and investigation on the vegetation in an arid area.