| 油菜氮素光谱定量分析中水分胁迫与光照影响及修 |
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| 引用本文： | 张晓东,毛罕平.油菜氮素光谱定量分析中水分胁迫与光照影响及修[J].农业机械学报,2009,40(2):164-169. |
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| 作者姓名： | 张晓东 毛罕平 |
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| 作者单位： | 江苏大学现代农业装备与技术省部共建教育部/江苏省重点实验室,镇江,212013 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，江苏省333高层次人才培养工程专项基金 |
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| 摘 要： | 研究了油菜氮素和水分胁迫在光谱检测中的相互作用,以及光照的变化对作物光谱检测的影响.为了克服光照因素对光谱检测的影响,针对氮素和水分的特征波长分别建立了基于光谱反射率变化率的光照修正模型;为了实现对氮素和水分相互作用的解耦,针对不同含水率水平的植株分别建立了全氮含量光谱特征的主成分回归模型.利用氮素光谱组合分析模型对植株全氮含量进行预测,结果表明,实测值与预测值的相关系数R为0.92,均方根误差(RMSE)为0.53,优于前期采用6特征波长变量和主成分回归法所建立的预测模型.
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| 关 键 词： | 油菜 含氮量 光照 水分胁迫 光谱分析 |
and Correction of Water Stress and Lighting Factor on Rape Nitrogen Content Spectral Analysis |
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| Zhang Xiaodong,Mao Hanping.and Correction of Water Stress and Lighting Factor on Rape Nitrogen Content Spectral Analysis[J].Transactions of the Chinese Society of Agricultural Machinery,2009,40(2):164-169. |
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| Authors: | Zhang Xiaodong Mao Hanping |
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| Institution: | Key Laboratory of Modern Agricultural Equipment and Technology;Ministry of Education & Jiangsu Province;Jiangsu University;Zhenjiang 212013;China |
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| Abstract: | The interaction between rape nitrogen content and water status and influencing factor of lighting in spectrum analysis were developed.In order to avoid the effect of lighting fluctuation,the correction models which based on variation ratio of spectral reflectance were established in each spectral characteristic wavelength of rape nitrogen content and moisture content.The method of principal component analysis(PCA) was used to establish the nitrogen spectral predictive model under different moisture content ... |
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| Keywords: | Rape Nitrogen content Lighting Water stress Spectral analysis |
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