成土母质对水稻土高光谱特性及其有机质含量光谱参数模型影响的初步研究

INFLUENCE OF PARENT MATERIALS ON PADDY SOIL HYPERSPECTRAL CHARACTERISTICS AND SOM SPECTRAL-PARAMETER-MODELS

以青紫泥 (BlueclayeyPaddysoil,BP)和红黄泥 (RedPaddysoil,RP)为例 ,研究发育于不同母质的水稻土高光谱和SOM含量光谱参数模型的差异性。结果表明 ,发育于河湖沉积物的BP的反射系数总体上高于发育于第四纪红色粘土母质的RP ,在与铁的氧化物有关的吸收波段 ,RP的吸收特性较BP强 ;RP的一阶微分的变化趋势总体上也比BP剧烈 ,特别是与铁的氧化物相关的波段及 2 2 0 0nm处 ;BP与RP的SOM的光谱参数模型所包含光谱波段的个数和位置有较大的差异 。

Blue clayey paddy (BP) soil and red paddy soil (RP) were selected as a case study of differences in hyperspectral and soil organic matter (SOM) spectral-parameter-models of paddy soils derived from different parent material. The results show that the reflectance of BP derived from the sediments is higher than that of RP derived from the Quaternary red earth within the studied bands as a whole, and the absorption characteristics of RP is more evident than that of BP within the absorption bands related to iron oxide. The variation of the first derivatives of reflectance of responsibility, on the whole, also tends to be more vigorous than that of BP, and it is more significant at the bands related to iron oxide and 2 200 nm especially. The number and wavelength of bands included in SOM content spectral-parameter-models differ drastically between BP and RP. The SOM content spectral-parameter-models of the paddy soils are shown to have unique characteristics related to the parent materials.