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在对2个荒漠化典型区土壤采样、化验分析和光谱测量的基础上,分析荒漠化土地土壤的反射光谱特征及土壤有机质的光谱敏感范围,构建多种土壤有机质含量高光谱估测模型。结果表明:荒漠化土地土壤具独特的波浪型光谱曲线,其主要特点是在可见光和近红外的500～900nm光谱范围存在一个明显的弓形突起区,其对提取土壤有机质信息有实际意义;相关分析发现,在中心波长分别为600和830nm的可见光和近红外光光谱范围分别存在1个有机质光谱敏感区;土壤有机质含量高光谱估测模型验证结果表明,利用波长588nm处的反射光谱对数lgR588和反射光谱倒数1/R588以及波长835nm处的反射光谱倒数的导数(1/R835)’和反射光谱对数的导数(lgR835)’分别建立的模型,可以较好地估测荒漠化土地土壤有机质含量。
On the basis of soil sampling, laboratory analysis and spectral measurement of two typical desertification areas, the characteristics of soil reflectance spectrum and the spectral sensitivity of soil organic matter were analyzed, and a variety of soil organic matter hyperspectral estimation models were constructed. The results show that the soil of desertified land has a unique wave-type spectral curve, and its main feature is that there is a distinct arcuate protuberance in the spectral range of 500-900 nm in visible and near infrared, which has practical significance for extracting soil organic matter information. Correlation analysis shows that , Respectively, and one organic spectral sensitive region exists in the visible and near-infrared spectral ranges of 600 and 830 nm respectively at the center wavelength. The results of model validation of hyperspectral estimation of soil organic matter content show that the spectral reflectance spectra at 588 nm reflectance at 1gR588 and reflectance Soil organic matter content of desertified land can be estimated well by using the models established respectively by 1 / R588 and 1 / R835 and the logarithm of the logarithm of reflected spectrum (1gR835).