摘要
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。
A total of 14 profiles and 84 soil samples were taken from 7 altitude gradients from 2 600—3 800 m and 13 vegetation types in Pailugou Basin.Air-dried soil samples were scanned and reflectance of samples was recorded for 350—2 500 nm using ASD hyperspectral sensor.The spectral characteristics and response principle were analyzed,and the results showed that: the change trend of most of spectrum is consistent,except for several spectral curves;the band,which SOM mainly affects on soil reflectance,was in 600—800 nm;when the SOM content was less than 20 g/kg,the spectral curve had an obvious convex in the region;the soil reflectance increased with the decrease of sand content and the increase of silt content at 400—1 300 nm,and decreased with the increase of clay content;the absorption vales appeared in 1 414 nm and 1 919 nm are caused by OH,and that in 2 210 nm and 2 350 nm was caused by-OH and CO32-;the absorption peaks appeared in 420 nm,490 nm,540 nm,660 nm and 900 nm after continuum removal because there are iron oxides in soil.
出处
《淮海工学院学报(自然科学版)》
CAS
2011年第4期54-59,共6页
Journal of Huaihai Institute of Technology:Natural Sciences Edition
基金
国家自然科学基金重大研究计划项目(91025022)
关键词
黑河流域
光谱特性
包络线去除
响应原理
Heihe River Basin
spectral characteristics
continuum removal
response principle