Tian Yuansheng, Zhang Yue, Sun Wenyi, Mu Xingmin, Gao Peng, Zhao Guangju. Spectral Characteristics of Biological Soil Crusts under the Different Types in the Water-Wind Erosion Crisscross Region on the Loess Plateau[J]. Spectroscopy and Spectral Analysis, 2018, 38(7): 2215