O_3胁迫对植物叶片光谱特征和叶绿素含量的影响

Influence of Ozone Stress on Spectral Characteristics and Chlorophyll Content of Woody Plant Leaves

为了研究空气浓度臭氧(O_3)对木本植物生长的影响,该研究通过对亚热带常见木本植物的实地调查,探索自然状态下对O_3敏感的木本植物种类,利用便携式光谱仪测量叶片的光谱反射率,提取红边位置反射率,分析其受O_3伤害后叶片光谱特征的变化,并结合通用叶绿素-光谱反射率模型计算O_3伤害对叶绿素含量的影响。研究结果表明,亚热带地区有多种木本植物受到了O_3伤害,导致叶片光谱反射率在可见光波段450~680 nm处有明显增高,红边位置极显著地发生蓝移,叶绿素含量极显著降低,说明空气O_3浓度对植物生长已经造成了严重的影响。

In order to research the effect of ozone（O3） on woody plant species,the study explored the sensibility of subtropical common woody species to O3 in the field,measured hyperspectral reflectance of leaves using the portable spectrometer,extracted the reflectance of red edge position,analyzed the variation of spectral signature in the before and after ozone injured,then calculated the effect of O3 injury to chlorophyll content of leaves with combining the generalized model of chlorophyll-reflection spectrum. The result showed that there are various kinds of damages on many woody species of subtropical by O3,leading to the spectrum reflectance significantly increased among the visible spectrum 450~680nm,red edge position significantly drifted to the blue wave and the chlorophyll content dramatically reduced. The study implied that the current concentration of tropospheric O3 has caused severe impacts on woody plants.