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首页> 外文会议>Conference on Ecosystems' Dynamics, Agricultural Remote Sensing and Modeling, and Site-Specific Agriculture; Aug 7, 2003; San Diego, California, USA >Corn Hyperspectral and Their Red Edge Characteristics
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Corn Hyperspectral and Their Red Edge Characteristics

机译：玉米高光谱及其红边特征

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摘要

The hyperspectral reflectance of the canopy in field, the first and the third unfold leaves from the top of corn are measured indoor in different stages by a ASD FieldSpec Pro FR~(TM) The concentrations of chlorophyll and carotenoid of leaves corresponding to the spectra are determined by biochemical method. The correlation between the pigment concentrations, leaf area indices, above ground biomass and fresh leaf mass and the red edge parameters of corn are analyzed. The hyperspectral reflectance are gradually getting smaller in the visible region and bigger in the near infrared region along with growth. The difference of reflectance between in the near infrared region and in the visible region is the biggest in flowering stage. There are "two peak" phenomena for the red edge of canopy spectra of corn. These phenomena are first the clearer with growth, then the clearest in flowering stage and after that are gradually weaken. The position of red edge ( λ_(red) )of canopy spectra are between 710nm and 740nm. There are 'red shift' phenomena for λ_(red) before flowering stage, the slope of red edge (D λ_(red) )and the area of red edge (S_(red))before the elongation stage, but are gradually smaller and 'blue shift' after flowering stage for the slope of red edge (D λ_(red) )and the area of red edge (S_(red) )of the canopy spectra. The leaf area indices(LAI), above ground fresh biomass, above ground dry biomass and fresh leaf mass are very significantly correlative to the red edge parameters λ_(red), D λ_(red) and S_(red) of the canopy spectra, and the concentrations of chlorophyll-a, chlorophyll-b, total chlorophyll and carotenoid of leaves also significantly correlative to their red edge parameters λ_(red) and D λ_(red). These prove that the red edge parameters (λ_(red), D λ_(red) and S_(red))can be used to estimate LAI, above ground biomass and fresh leaf mass. The parameters of λ_(red) and D λ_(red) can be used to estimate the concentrations chlorophyll and carotenoid of leaves for corn.
机译：通过ASD FieldSpec Pro FR〜（TM）在室内在不同阶段对田地冠层，从玉米顶部伸出的第一和第三张叶片的高光谱反射率进行了测量。对应于光谱的叶片叶绿素和类胡萝卜素的浓度为通过生化法测定。分析了色素浓度，叶面积指数，地上生物量和新鲜叶质量与玉米红边参数之间的相关性。随着增长，高光谱反射率在可见光区域逐渐变小，而在近红外区域则逐渐变大。在开花期，近红外区和可见区之间的反射率差异最大。玉米冠层光谱的红色边缘存在“两个峰值”现象。这些现象首先随着生长而变得更清晰，然后在花期最清晰，然后逐渐减弱。冠层光谱的红色边缘（λ_（red））的位置在710nm至740nm之间。开花期之前，λ_（红色），红色边缘的斜率（Dλ_（red））和红色边缘的面积（S_（red））存在“红移”现象，但逐渐变小，并且开花期后，冠层光谱的红色边缘（Dλ_（red））的斜率和红色边缘区域（S_（red））的“蓝移”。叶面积指数（LAI），地上新鲜生物量，地上干燥生物量和新鲜叶质量与冠层光谱的红边参数λ_（红色），Dλ_（红色）和S_（红色）非常相关，叶片的叶绿素a，叶绿素b，总叶绿素和类胡萝卜素的浓度也与它们的红边参数λ_（red）和Dλ_（red）显着相关。这些证明了红色边缘参数（λ_（红色），Dλ_（红色）和S_（红色））可用于估计地面生物量和新鲜叶片质量以上的LAI。 λ_（red）和Dλ_（red）的参数可用于估计玉米叶片的叶绿素和类胡萝卜素浓度。

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