松毛虫危害的光谱特征与虫害早期探测模式

Spectral Characteristics of the Pine Leaves Damaged by Pine Moth and a Model for Detecting the Damage Early

根据生态学特征，本文将松毛虫危害的针叶样品分为５个等级，对其反射光谱和叶绿素含量进行了测量分析。结果表明，随受害程度加重，叶绿素含量降低，５５０ｎｍ处的反射率、近红外肩反射率与红光最低反射率之差及红界一阶导数谱最大值均呈下降趋势，６３０ｎｍ处反射率呈上升趋势，红界光谱蓝移、叶绿素反射峰红移明显。应用逐步判别分析法对比分析证实了细分光谱特征参量比绿、红、近红外三波段反射率参量有更强的判别分类能力，这就为用细分光谱特征参量早期遥感探测松毛虫害提供了判别模式。

On the basis of ecological characteristics,the pine leaves damaged bypine moth were classified on five levels and their reflectance and chlorophyll con-tents were measured and analyzed in this paper.The results indicate that damageis becoming more serious,①the chlorophy11 content is down,②the reflectance at 550nm,the difference between the infrared shoulder reflec-tance and the lowest reflectance in red range,and the largest value of the firstderivative in red reflectance edge,all come down,③the reflectance at 630nm goes up,④blue shift of the red edge spectra and red shift of the chlorophyll reflec-tance peak are obvious。With the stepwize discrimination analysis,it was analyzed and was proved thatthe characteristic parameters of the fine spectra of the damaged pine leaves havestronger capability than the single-reflectance parameters in the three bands ofgreen,red and infrared for discrimination and classification of the damage,Thispaper also gave out a discrimination model for the damage forecast with the remotesensing approach。