关键词: 武陵源风景名胜区, 珙桐（Davidia involucrata Baill.）, 群落, 特征光谱, 湖南省张家界市

Abstract: In order to find out the characteristic spectrum of Davidia involucrata, a rare plant in Wulingyuan scenic spot, Zhangjiajie City, Hunan Province, and its main tree species in the community, using the ASD FieldSpec 4 portable ground object spectrometer, the reflectance spectra of five tree species, including Davidia involucrata, Euscaphiss japonica, Acer palmatum ‘Atropurpureum', Cinnamomum camphora and Schima superba were analyzed using differential and continuum removal methods. The results showed that the original spectral curve was located in the near-infrared band, and there were significant differences in the reflectance of the main tree species in the Davidia involucrata community. The optimal bands for identification were 780~920 nm, 1 000~1 349 nm, 1 427~1 590 nm, 1 590~1 785 nm, and 1 981~2 459 nm; 490~530 nm, 550~582 nm, 680~760 nm, 1 110~1 190 nm were the best distinguishing bands obtained by combining first-order differential data with “trilateral parameter” analysis; based on the analysis of the continuum removal curve, the curve highlighted four absorption valleys and one reflection peak, with characteristic bands of 440~500 nm, 520~640 nm, 640~690 nm. The spectral absorption characteristic parameters were analyzed based on the continuum removal data in the 540~760 nm band, and the five types of tree species could be distinguished by the absorption peak area and spectral absorption coefficient in this band.

Key words: Wulingyuan scenic spot, Davidia involucrata Baill., community, characteristic spectrum, Zhangjiajie City, Hunan Province