小麦条锈病单叶片光谱和叶绿素含量关系分析

The correlation analysis between spectrum and leaf chlorophyll content in wheat stripe rust infection

为了利用遥感监测小麦条锈病,研究条锈病侵染后小麦单叶光谱和叶绿素含量变化,人工接种条锈病菌在小麦幼苗上,测得接种1～24d的光谱和叶绿素含量,将其叶绿素含量与光谱及其一阶微分做相关性分析,利用光谱微分参数进行方程的模拟。接种1～12d,感染条锈病的叶片叶绿素含量与原始光谱及其一阶微分光谱在可见光波段呈负相关关系,接种13～24d,两者在可见光波段呈正相关的关系。接种后1～12d的方程模拟中以SDb为变量的模型为最佳模型,接种13～24d的方程模拟中以SDr/SDg为变量的模型为最佳模型,说明可利用光谱参数进行条锈病侵染小麦的早期监测。

In order to monitor the wheat stripe rust infection with remote sensing,the relationship between the spectrum of single leaf and leaf chlorophyll content was studied.The wheat stripe rust pathogen was inoculated into seedlings,and then measured the spectrum and chlorophyll content 1-24 days following inoculation.The correlation between chlorophyll content and spectrum and the first-order differential was analyzed.The equation simulation was made with the spectral parameters.Leaf chlorophyll content was negatively related to either original spectrum or the first-order differential in the visible light spectrum 1-12 days after inoculating wheat stripe rust.However,the relationships became positive 13-24 days after the inoculation.The model was optimal with variable SDb in the simulation equation of 1-12 days after inoculation,but with SDr/SDg for the model of 13-24 days after inoculating wheat stripe rust.