【摘要】 :在区域尺度上 ,不同地带性的草地植被反射波谱特征之间差异极显著 ,利用可见光波段反射率形成的鉴别函数可以在平均识别错误概率低于 2 0 %的精度上予以鉴别 ,而在中小尺度上群落波谱反射特征的差异程度与群落类型有关 ,典型草原的几个代表性群落 -大针茅草原群落、克氏针茅草原、羊草草原、冷蒿草原等群落波谱特征的差异程度较高 ,平均鉴别错误概率小于 1 5% ,而在荒漠草原中 ,只有在灌丛化与非灌丛化草地群落之间波谱特征才有显著差异 ,但在非灌丛化群落复合体内部 ,不同群落之间反射波谱特征差异较小 ,草甸草原中主要群落的反射波谱特征之间的差异程度也较低 .更多还原

【Abstract】 There were remarkable differences on near ground spectral reflectance among the different zonal grassland vegetation desert steppe, typical steppe and meadow steppe which can be discriminated by PCA or pattern recognition method, the mean probability of error(PE%) obtained by the discrimination functions composed of visible light spectral reflectance were lower than 20%.The difference degree of spectral reflectance for communities on middle or small spatial scales were related to the communities type, the difference degree were higher among the communities of Stipa grandis, S.kerlovii, Leymus chinense and Artemisia frigida,, the mean probability of error(PE%) were lower than 15%.There were remarkable difference of reflectance only between shrub communities and non shrub communities in desert steppe ,but the difference of reflectance were not remarkable inside the non shrub community and the difference degree of reflectance were lower ,too, in the different communities of meadow steppe.更多还原