长白山红松臭冷杉光谱反射随海拔的变化  

Changes of spectral reflectance of Pinus koraiensis and Abies nephrolepis along altitudinal gradients in Changbai Mountain

作　　者：范秀华[1] 刘伟国[1] 卢文敏[1] 方晓雨[1] 

机构地区：[1]北京林业大学理学院,北京100083

出　　处：《生态学报》2011年第14期3910-3917,共8页Acta Ecologica Sinica

基　　金：国家"十一五"科技支撑项目(2006BAD03A0804);国家自然科学基金项目(30940012)

摘　　要：使用光谱仪测量长白山主要针叶树种红松、臭冷杉不同海拔针叶的光谱反射率,对比了两树种不同海拔间光谱反射率、光谱指数的差异。结果表明:两种针叶树在不同海拔的光谱反射率变化明显,可见光区和近红外区各波段的光谱反射率与海拔有很强的相关性,光谱指数也有显著差异,说明相关生理状况发生明显变化,随海拔的升高,叶绿素的含量降低,单位叶绿素的类胡萝卜素含量增大;对比各海拔光谱反射率发现,1279 m处红松、臭冷杉针叶的色素含量较高,叶绿素指数说明748 m处红松、臭冷杉针叶叶绿素含量显著高于1040 m和1279 m处,Car:Chl指数表明红松、臭冷杉均在748 m处受到较弱的胁迫,臭冷杉在1040 m受到较强的胁迫。In order to assess the influence of altitudinal gradients on the spectral reflectance of Pinus koraiensis and Abies nephrolepis which are two dominant conifers in Changbai Mountain,we measured the spectral reflectance of their needles at different altitudinal study sites,using a spectral analysis system in 2008（Unispec-SC spectral analysis system）.Samples were chosen in three altitudinal sites（748 m,1040 m and 1279 m,respectively） to represent the variability of spectral reflectance in our study.Six trees were selected for each studied species in each study site.Measurements were performed at noon during sunny day.Before we assessed the variation of the spectral reflectance,ordinary methods measuring the pigment contents were adopted to examine the correlations between pigment contents and spectral indices.And spectrophotometer was used to analyze the pigment concentrations.Most of the spectral indices were significantly correlated with pigment concentration at the 0.05 level.We compared the characters of spectral reflectance and spectral indices among study sites.The ratios of spectral reflectance for each wavelength were calculated.Spectral indices for each species,including three indices for chlorophyll and two for carotenoid and two for Car∶Chl,were analyzed subsequently.To quantify relationships between spectral reflectance and altitudes,Pearson correlation coefficients were analyzed for altitudinal gradients and specific wavelength.The results showed that there were significant differences in the spectral reflectance among different altitudinal sites.Strong correlations were found between elevation and wavelength in visible and near infrared regions.Spectral indices also showed significant variations with altitude increase.Maybe this means the changes of physiological conditions.The chlorophyll content decreased and the carotenoid content per unit chlorophyll concentration（Car∶Chl） increased with the increasing of the altitude.Lower total pigment concentration of P.koraiensis and A.nephrolep

关 键 词：色素 海拔梯度 光谱反射率 

分 类 号：S791.142[农业科学—林木遗传育种] Q948[农业科学—林学]