Hyperspectral identification of winter wheat under the conditions of aphid harm and drought threat

doi:10.6046/gtzyyg.2013.03.25

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Abstract

The judgment of the drought threat and aphid harm of winter wheat can further improve the accuracy of monitoring disaster types based on hyperspectral remote sensing data. In this paper, the responses of the reflectance of winter wheat canopy to aphid harm(Macrosiphum avenae(Fabricius))and the drought threat were monitored through controlling the different water treatments under the last phase of the wheat existent in the milk. The most sensitive spectral bands for recognizing aphid pest and drought threat of winter wheat were selected through first derivative data transformation. The experimental results show that, under aphid harm and drought threat,the changes of winter wheat's spectral characteristics in near-infrared band are significantly higher than those in visible light band during the last phase of the wheat existent in the milk. And the most sensitive spectral bands identifying aphid harm and drought threat are visible and near-infrared bands. After the first derivative data transformation,it is found that the slope of the red edge is the smallest when the natural precipitation treatment is less than 40%,and the slopes of the red edge of aphid harm become bigger and bigger when the water treatments of the irrigation amount are higher than 70%,60%~70%,50%~60% and 40%~50% of water requirement, respectively. The red edge wavelength of aphid harm is the shortest,and the wavelengths of different water treatments become shorter with the increase of the drought stress. The red edge parameters can therefore serve as the important parameters for recognizing aphid harm and drought threat of winter wheat.

Keywords aboveground biomass typical grassland estimate model Tibetan Plateau

:	TP 79
	S 166

Issue Date: 03 July 2013

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	CHU Duo
	DEJI Yangzong
	JI Qiumei
	TANG Hong

Cite this article:

CHU Duo,DEJI Yangzong,JI Qiumei, et al. Hyperspectral identification of winter wheat under the conditions of aphid harm and drought threat[J]. REMOTE SENSING FOR LAND & RESOURCES, 2013, 25(3): 153-158.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2013.03.25 OR https://www.gtzyyg.com/EN/Y2013/V25/I3/153

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