植物叶片的光谱性质及景观形成

Spectral Properties of Plant Leaves and Landscape Formation

为了解植被的太阳紫外辐射的调节机制,本研究采用分光光度计测量植物叶片的光谱反射率和透射率。研究结果表明,高等植物具有低叶片反射率(约5%)并且在整个UV区域呈现零透射率,而这与植物种类和季节变化无关,与植物种类以及叶子结构对可见光的叶子透明度无关。茂密的树木叶子几乎可以过滤掉来自太阳辐射和漫射的紫外线。为了拦截来自所有方向漫射的紫外线辐射,应考虑紫外线防护垂直结构,应选择对于特定场地的遮荫树种和不同植物种类,以减少紫外线辐射的伤害。

In order to understand the re gulation mec hanism of solar ultraviolet radiation of vegetation, spectrophotometer was used to measure the spectral reflectance and transmittance of plant leaves. The research results show that higher plants have low leaf reflectivity(about 5%) and zero transmittance in the entire UV region, which has nothing to do with plant species and seasonal changes, and has nothing to do with the transparency of plant species and leaf structure to visible light. The dense leaves of trees can almost filter out the solar radiation and diffuse ultraviolet rays. In order to intercept the diffuse ultraviolet radiation from all directions, the vertical structure of ultraviolet protection should be considered, and shading trees and different plant species for specific sites should be selected to reduce the damage of ultraviolet radiation.