摘要
对分布于甘肃省东部的黑壤土、灰褐土、黄绵土、新积土4个土类的7个土属进行电磁波谱测试。在0.4～1.1μm波段内,以土种为单位共测试21条裸土光谱曲线。从形态上可区分为缓斜型和陡坎型。在0.4～0.65μm波段内,各土壤光谱反射率值多相互交错分布,但在0.65～1.1μm波段内,陡坎型类土壤的光谱反射率值多高于缓斜型。土壤表层质地差异大时,将影响电磁波辐射能量的变化,当土壤表层水分含量小于饱和含水量时,在0.55～0.95μm波段内,土壤水分含量越高,其光谱反射率值越低。经各波段与反射率之间的相关分析说明,缓斜型土壤光谱曲线以一元一次回归曲线拟合程度高,而陡坎型土壤则以一元二次回归曲线拟合更为理想。该结果为在遥感图像中提取土壤线信息,提供了可参考的数据。
The electromagnetic spectra of four soils distributed in eastern part of Gansu Province were tested.Within the spectral bands from 0.4μm to 1.1μm,twenty-one spectral curves of bare lands of different soil species were tested.The variations of electromagnetic wave radiating power will be affected if there are large enough differences among the surface stratum soil textures.Within the spectral bands from 0.65μm to 0.95μm,the higher the soil water contents are,the lower the spectra reflectances are,if the surface stratum soils are unsaturated.The analysis of correlation between spectral bands and their reflectances shows that linearcorrelation used well in slow slope lands and quadratic equation in steep slope lands.
出处
《遥感技术与应用》
CSCD
1992年第2期25-31,共7页
Remote Sensing Technology and Application
关键词
光谱特征
遥感
土壤
Spectral reflectance of soil Spectral feature of soil Remote sensing
