冬小麦灌浆期蚜虫危害高光谱特征研究

Spectrum characteristics of winter wheat infected by aphid in filling stage

为了有效控制农业生产中麦蚜的危害,提高利用遥感技术对麦蚜监测预报的时效性,在冬小麦蚜虫发生的关键生育时期(灌浆期),获取了26个地面调查点的蚜害等级和冠层光谱数据。对比分析了不同蚜害等级的冠层光谱,发现随着蚜虫危害程度的加重,在可见光、近红外和短波红外波段的冬小麦冠层反射率均逐渐减小。通过进一步筛选各波段范围的最敏感波段,初步构建了冬小麦蚜害高光谱指数,并建立了蚜害高光谱指数与蚜害等级的遥感反演模型。结果表明,该模型可以用来反演灌浆期冬小麦的蚜害等级,为高光谱遥感识别和监测冬小麦灌浆期蚜虫危害提供理论依据。

In order to control the aphid damage in agricultural production efficiently and enhance the timeliness in monitoring and prediction of aphid by remote sensing technology,twenty-six survey points at different aphid damage levels were selected and canopy spectra were collected accordingly by ASD hand hold spectrometer in the filling stage of winter wheat.By comparing and analyzing the characteristics of different aphid damage levels,it was concluded that canopy reflectance gradually decreased within 350～1750 nm,especially in the near infrared region.Further more,the sensitive bands were selected out by relevance analysis in the visible,near-infrared,and short-wave infrared region,respectively,and the aphid hyperspectral vegetation index（ADHI） was established based on the most sensitive bands.Finally,the regressive model for ADHI and aphid damage levels was established,and the results clearly showed the potential of retrieval model（R2=0.839,n=26） for quantifying aphid damage levels in the filling stage of winter wheat.The results can provide a theoretical basis for identifying aphid and monitoring aphid damage levels.