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干旱胁迫下旺长期烤烟冠层叶绿素密度的高光谱估测-中国烟草科学.PDF

发布:2017-06-10约2.78万字共6页下载文档
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2017-02 ,38 (1) 中国烟草科学 Chinese Tobacco Science 23 干旱胁迫下旺长期烤烟冠层叶绿素密度的高光谱估测 1 1* 2 李梦竹 ,刘国顺 ,贾方方 (1.河南农业大学,烟草行业烟草栽培重点实验室,郑州 450002 ;2.商丘师范学院,河南 商丘 476000 ) 摘 要:为精准、实时、无损地估算烤烟冠层叶绿素密度,快速获取烤烟光合性能与营养状况,基于不同程度干旱胁迫处理, 采用ASD 光谱仪,在综合分析群体原始高光谱反射率、一阶导数光谱反射率及已有光谱指数与冠层叶绿素密度 (CCD )关 系的基础上,建立烤烟 CCD 估算模型。结果表明:(1)干旱胁迫后烤烟冠层光谱反射率随叶绿素密度呈现规律性变化。 (2 )712 nm 处的一阶导数与CCD 相关性最好(r=0.838 )。(3 )利用一阶导数光谱建立的反演叶绿素密度的线性模型和BP 神经网络模型中,均以BP 神经网络模型效果最好,其模型决定系数R2 为0.9686 ,均方根误差RMSE 0.0778,表明模型的精 度和稳定性均较好。研究结果可为实时监测旺长期烤烟群体光合能力及水分胁迫状况提供栽培管理依据。 关键词:烤烟;旺长期;冠层叶绿素密度;干旱胁迫;估算模型 中图分类号:S572.01 文章编号:1007-5119 (2017 )0 1-0023-06 DOI :10.13496/j.issn.1007-5119.2017.01.004 Hyperspectral Estimation of Canopy Chlorophyll Density in Flue-cured Tobacco under Different Drought Stress at the Vigorous Growth Stage 1 1* 2 LI Mengzhu , LIU Guoshun , JIA Fangfang (1. National Tobacco Cultivation Physiology Biochemistry Research Center, Henan Agricultural University, Zhengzhou 450002, China; 2. Shangqiu Normal University, Shangqiu, Henan 476000, China) Abstract : This study aims to estimate the canopy chlorophyll density (CCD) of flue-cured tobacco with non destructive and accurate methods in real time to obtain the photosynthetic capacity and nutritional status. To this end, the relationship of canopy chlorophyll density and hyperspectral reflectance of flue-cured tobacco under different drought stresses was studied using an ASD spectrometer. Estimating models of the flue-cured tobacco canopy chlorophyll density were set up by means of the first derivative spectral reflectance. The results indicated that flue-cured tobacco canopy spectral reflectance showed orderly
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