关键词: 葡萄砧木, 葡萄砧木, 抗寒, 电导率, 主成分分析

Abstract: In order to establish the spectra database of indicative vegetations in the East Dongting Lake Wetland, the author obtained hyperspectral remote sensing window by analyzing the hyperspectral characteristics of indicative vegetations in that area, which could provide technological supports for the wetland health. 5 typical types of wetland vegetations in the East Dongting Lake, those were Carex, Artemisia, Phragmites communis, Polygonum hydropiper, and Juncus effusus., were chosen as the indicator vegetations to be investigated. The spectral characteristics, the distinguish bands, and the fundamental rules of 5 indicated vegetations based on field measurement had been analyzed. The results demonstrated that: (1) there were obvious differences among the waveband of 610-680 nm, 810-880 nm, 1030-1100 nm, 1170-1240 nm, and 1635-1705 nm; especially in the waveband of 1030-1100 nm, the spectrum difference among those 5 indicative vegetations is most distinct, and the distinguish of the spectral curve was shaper; (2) by transmitting spectral reflectance (R) of 5 wetland vegetations, namely, Carex, Artemisia, Phragmites communis, Polygonum hydropiper, Juncus effusus into LOG(1/R), a band of 660-680 nm which could be used to distinguish those 5 plants, was achieved, where the reciprocal’s logarithm of 5 vegetations were listed from lowest to highest, namely, Carex, Artemisia, Phragmites communis, Juncus effusus, Artemisia; (3) after denoising and LOG(1/R) of the same wetland vegetation with different spectral data, the band of 500-700 nm could obviously distinguish the growing state of the sedge, that was, spectral reflectance’s LOG(1/R) of Carex in good condition was higher than that of Carex in bad condition.