马尾松毛虫危害程度的高光谱监测方法

Monitoring Dendrolimus punctatus Harmed on Pinus massoniana With Hyperspectral Data

以受松毛虫不同危害程度的马尾松林分为研究对象,对在受到松毛虫危害时的马尾松冠层物理参数(单簇针叶体积、针叶长度、针叶中间直径)和马尾松林冠层高光谱光谱指数之间的关系进行分析,结果表明:(1)冠层的单簇针叶体积的变化可直接反应松毛虫的危害程度,单簇针叶体积越小虫害越严重,它的变化也引起了冠层光谱的各植被指数发生不同程度的变化,而其他冠层物理参数不能反应出松毛虫的危害程度。(2)从马尾松林冠层提取的高光谱遥感植被指数对虫害的不同程度的敏感性不同。增强型植被指数(EVI)、绿波段叶绿素指数(Red/Green)和归一化指标指数(NDVI)在虫害发生的中期与晚期有显著变化,但具有饱和现象,不能用来对马尾松林分受松毛虫虫害时进行早期监测;而红边波段叶绿素指数(CI_(rededge))、比值植被指数(RVI_(550))、比值植被指数(RVI_(700))、绿波段归一化植被指数(gNDVI)、差值植被指数(DVI)和结构不敏感色素指数(SPID)在虫害发生的整个时间范围内都有很明显的变化,不会达到饱和,可以在虫害发生的早期就进行监测。

This paper want to find out that how the Pinus massoniana canopy reflectance reflect the mason pine caterpillar damage stage.The canopy reflectance of P.massoniana at different damage stage were measured in situ,and 9 different spectral indices were calculated to reflect the pine moths damage degree.The results show that：（1）The change of canopy needle volume indicated the harm degree by pine moth,the smaller of canopy needles volume,and the more pests had.While the change of canopy cluster needles also influenced the canopy spectral vegetation index.（2）Vegetation indices derived from P.massoniana canopy reflectance data can reflect damage degrees,but the sensitivity was not the same.Enhanced vegetation index（EVI）,green band chlorophyll index（Red/Green）and normal difference vegetation index（NDVI）had a significant change when in the mid and late stage,but these VIs also had saturation phenomenon especially in the early stage,they were more sensitive in the late stage then in the early stage of Mason pine caterpillar.The chlorophyll index at red edge band（CI_（rededge））,ratio vegetation index at 550 nm（RVI_（550））,ratio vegetation index at 700 nm（RVI_（700））,green band normalized difference vegetation index（gNDVI）,difference vegetation index（DVI）and structure-pigment insensitive index（SPID）were obviously the changed in the whole range and had no saturation and sensitive at the entire period of the insect pest,so it could be used to monitor in the early stage.