叶片表面蜡质层对植被光谱反射率的影响

Effect of Waxy Layer on Leaf Surface on Vegetation Spectral Reflectance

首先获取叶片去除表面蜡质层前后光谱反射率,比较分析叶片表面蜡质层的光谱特征,探究叶片去除蜡质层前后叶片反射率的变化。结果表明:叶片去除蜡质层后在400~2500 nm光谱区间反射率发生较明显改变;去除蜡质层对植被红边参数没有影响,并不会导致“红边”移动,叶片表面的蜡质并不影响绿色植被所特有的反射特征;不同叶片蜡质层对不同植被影响不同,叶片反射曲线不是叶片表面蜡质反射曲线和经去蜡质处理的叶片反射曲线简单的线性叠加。植被叶片的光谱定量分析可为公路植被遥感环境评价提供支持。

At present,the research on spectral reflectance and transmittance of vegetation leaves ignores the influence of the wax layer on the surface of vegetation leaves.In order to improve the accuracy of leaf radiation simulation,it is necessary to consider the influence of wax layer on the reflectance and transmission of vegetation leaves.In this paper,the spectral reflectance before and after removing the wax layer was obtained,and the spectral characteristics of the wax layer on the leaf surface were compared and analyzed to explore the change of the leaf reflectance before and after removing the wax layer.The results showed that:the reflectance of the 400~2500 nm spectral range changed significantly before and after removing the wax layer;the removal of wax layer had no effect on the red edge parameters of vegetation,and did not lead to the"red edge"movement;the wax on the surface of leaves did not affect the unique reflection characteristics of green vegetation;different wax layers had different effects on different vegetation,and the leaf reflection curve was not the leaf surface The waxy reflection curve and the dewaxed leaf reflectance curve are simply linear superposition.Quantitative vegetation spectral analysis could provide support for remote sensing environmental assessment of highway vegetation.