基于地面高光谱数据的东亚飞蝗危害程度监测

20世纪80年代以来东亚飞蝗在中国再度猖獗,及时、准确地监测东亚飞蝗的危害程度,对于东亚飞蝗的有效防治有重要意义。本研究以河北省黄骅市为研究区,利用地面高光谱数据,分析和比较了正常生长芦苇和受蝗虫危害芦苇的冠层反射光谱和高光谱特征参数的差异,并建立了高光谱特征参数与芦苇叶面积指数（LAI）的关系模型。结果表明,其中的虫害光谱指数（DSI）最适用于反映研究区芦苇受蝗虫危害的程度。在此基础上,利用DSI对研究区蝗虫的危害程度进行了划分,即：DSI〉62.856未受危害;41.254≤DSI≤59.496轻度危害;DSI〈41.254严重危害。

Monitoring of the Damage Intensity Extent by Oriental Migratory Locust Using of Hyper-spectra Data Measured at Ground Surface

Since 1980s of the 20~(th) Century,outbreak of oriental migratory locust has rampantly emerged again in some regions of China.It is particularly important to monitor timely and accurately the intensity of damage from oriental migratory locust(Locusta migratoria manilensis Meyen) for realizing efficient control and prevention of this kind of insect pest.In this study Huanghua County of Hebei province was chosen as the study area and based on the hyper-spectra data measured at ground surface,the difference in canopy reflectance spectra and the characteristic parameters of hyper-spectra data were analyzed and compared for the reeds in normal growing condition and for those under damaging from locust.In addition,five kinds of model were developed to reflect the relations between the characteristic parameters of hyper-spectra and Leaf Area Index(LAI) of reeds.The results show that among those indices the locust damage spectra index(DSI) is one which is mostly suitable to use in indicating the intensity of locust damage in the study area.Following this step,a classification scheme for the locust damage intensity was worked out based on DSI data for use in the study area,i.e.no damage if DSI is over 62.856,slight damage if DSI is between 41.254 and 59.496,and serious damage if DSI is less than 41.254.