光照高度角对土壤反射光谱特性的影响研究  

Effect of the Light Elevation Angle on Soil Reflective Spectrum Characteristics

作　　者：张晋[1] 常庆瑞[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《土壤通报》2009年第3期509-512,共4页Chinese Journal of Soil Science

基　　金：国家重点基础研究发展计划(2007CB407203);国家自然科学基金项目(30571527)

摘　　要：土壤对电磁辐射的反射状况很复杂,受许多因素的控制。室内实验研究得出:供试土壤在波长350nm-1050nm反射光谱为单调上升曲线,土壤光谱反射率的大小与入射光的高度角有密切关系,反射光谱形成一条下凹曲线,在40°～50°之间出现极小值,可以用2次多项式回归模型定量模拟;造成不同光照高度角土壤反射率不同的原因可能是土粒之间的阴影差异和粗糙度不同。The soil reflection of electromagnetic radiation is very complicated and effected by many factors. Experiments in the laboratory showed that reflectance curve of the tested soil in wavelength 350nm-1050nm was a monotone rising curve, and soil reflectance closely related to elevation angle of the incident light, the reflection spectra formed a concave curve, with the minimum at 40° -50° which could be set up a quantitative simulation model through the 2nd polynomial regression. The soil reflectance varied with light elevation angle was likely to be caused by the shade difference and different roughness among soil particles.

关 键 词：土壤光谱 光照高度角 定量模型 

分 类 号：S129[农业科学—农业基础科学]