松材线虫自然侵染后松树不同感病阶段针叶光谱特征变化

Changes of Reflectance Spectra of Pine Needles in Different Stage after Being Infected by Pine Wood Nematode

采用ASD野外光谱仪测量了黑松和马尾松在松材线虫自然侵染后不同感病阶段的反射光谱,分析了其中光谱特征参数及叶绿素变化情况。研究表明:(1)中红外波段反射光谱曲线对松树发病初期有一定的指示作用;(2)红边位置、绿峰高度、红谷反射率、红边斜率、水分胁迫波段反射率等参数的动态变化趋势与松材线虫侵染后两种松树的病害特征是一致的;(3)随病害程度加深两种松树叶绿素含量逐渐降低,且与光谱特征参数之间存显著线性关系。研究结果为利用高光谱遥感技术进行松材线虫病监测与预警提供参考,同时为针对不同发病阶段采用不同的措施治理松材线虫病提供新的实验依据。

In the present study,seedlings of Pinus Thunbergii and Pinus Massoniana were planted and used for reflectance spectrum measurement.In different stage after being infected by pine wood nematode,reflectance spectra were measured by ASD spectrometer and the features of spectral parameters and the change of chlorophyll were analyzed.The results showed that（1） Disease could be estimated in the early stage according to the curve of mid-infrared reflectance;（2） Dynamic parameters such as the position of red edge,green peak height,reflectance of red band,slope of red edge and reflectance of water-stressed wave band were consistent with the disease features of two pine species after being infected by pine wood nematode;（3） To both of two pine species,content of chlorophyll tended to reduce with the development of disease and obvious linear relationship was observed between chlorophyll content and spectral parameters.There results might be able to provide some theoretical basis for the application of remote sensing technology in monitoring of pine wood disease.In addition,it might be also used as theoretical support for the controlling measures in different stage after being infected by pine wood nematode.