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采集黑河上游排露沟小流域的多个土壤剖面的84个土壤样品,自然风干处理后,利用美国ASD光谱仪获得土壤的反射光谱曲线,分析其光谱特性与响应原理。结果显示:个别土壤曲线表现出与众不同的波浪状形态;有机质对反射率的影响在600～800nm最为明显,当其质量分数小于20g/kg时,表现出明显的陡坎状凸起;土壤反射率随粉粒含量的增加而升高;1 414和1 919nm附近的吸收谷是由OH伸缩振动的一级倍频和二级泛频产生,2 210和2 350nm附近是由金属-OH和CO32-倍频或合频引起,包络线去除后,420,490,540,660和900nm处表现出明显的吸收谷,是因为存在铁氧化物。
Eighty-four soil samples were collected from a number of soil profiles in Paichao small watershed in the upper reaches of the Heihe River. After natural air-drying treatment, the soil reflectance curve was obtained by using the ASD spectrometer in the United States. The spectral characteristics and response principle were analyzed. The results showed that the curves of individual soils showed distinctive wavy forms. The effect of organic matter on the reflectance was the most obvious at 600-800 nm. When the mass fraction was less than 20 g / kg, The reflectivity increases with the increase of the content of particles. The absorption valley near 1 414 and 1 919 nm is generated by the first and second order overtones of OH stretching vibration. The near 2 210 and 2 350 nm are formed by metal-OH and CO32-frequency doubling or combined frequency, the envelope after removal, 420,490,540,660 and 900nm showed a significant absorption valley, because of the presence of iron oxide.