长白山红松臭冷杉光谱反射随海拔的变化
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

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


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

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 文章评论
    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。

    Abstract:

    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. nephrolepis occurred at medium altitudinal site (i.e, 1040 m). Both studied species, P. koraiensis and A. nephrolepis, showed the highest total pigment content at higher altitudinal site (i.e, 1279 m). Significant differences among altitudinal sites were found for every studied species. Strong correlations occurred in most of waveband, although there were obviously differences between two studied species. Chlorophyll indices indicated that the highest chlorophyll content of P. koraiensis and A. nephrolepis occurred in lower altitudinal site (i.e, 748 m). The highest Car ∶ Chl in needles of A. nephrolepis occurred was in medium elevation (1040 m) in broad-leaved Korean pine mixed forest and spruce-fir mixed forest. These indicated P. koraiensis and A. nephrolepis in 748 m confronted lower stress, and A. nephrolepis confronted the highest stress in 1040 m among three gradients. Spectral reflectance curve and spectral indices varied with the elevation. It suggested that the physiological status of P. koraiensis and A. nephrolepis changed. But there was no significant difference in spectral characters between medium elevation (1040 m) and higher elevation (1279 m) in P. koraiensis. This may be attributed to the variations of special character of ecotone. Trees always showed higher chlorophyll concentration in their dominant distribution regions, thus the dominant distribution region of P. koraiensis was probably lower than 1040 m.

    参考文献
    相似文献
    引证文献
引用本文

范秀华,刘伟国,卢文敏,方晓雨.长白山红松臭冷杉光谱反射随海拔的变化.生态学报,2011,31(14):3910~3917

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数: