| 两种用于作物冠层叶绿素含量提取的改进光谱指数 |
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| 引用本文： | 关丽,刘湘南.两种用于作物冠层叶绿素含量提取的改进光谱指数[J].地球科学进展,2009,24(5):548-554. |
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| 作者姓名： | 关丽 刘湘南 |
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| 作者单位： | 1. 北京大学遥感与GIS研究所,北京,100871
2. 中国地质大学(北京)信息工程学院,北京,100083 |
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| 基金项目： | 国家自然科学基金，中国高技术研究发展计划项目 |
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| 摘 要： | 在深入探讨目前广泛使用的提取叶绿素含量的植被指数的光谱响应机制基础上,利用PROSPECT+SAIL模型模拟的作物冠层反射率样本数据对比分析了这些植被指数对叶绿素含量变化的敏感性差异,包括PSSRa、PSSRb、PSNDa、PSNDb、NPCI、PRI、MCARI和TVI等.结果表明,上述植被指数或对土壤背景变化敏感,或受高值LAI影响趋于饱和,对作物叶绿素含量反演效果均不理想.提出了4种基于TVI和MCARI的改进植被指数MTVI1、MTVI2、MCARI1和MCARI2,揭示了它们对土壤背景和LAI不敏感,对叶绿素含量变化更为敏感的光谱机制,并根据实验数据对其进行验证.实验表明,改进的植被指数MTVI2和MCARI2是作物冠层叶绿素含量较好的预测器,可据此建立作物冠层叶绿素含量反演模型.
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| 关 键 词： | 叶绿素含量 改进光谱指数 |
Two Kinds of Modified Spectral Indices for Retrieval of Crop Canopy Chlorophyll Content |
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| GUAN Li,LIU Xiangnan.Two Kinds of Modified Spectral Indices for Retrieval of Crop Canopy Chlorophyll Content[J].Advance in Earth Sciences,2009,24(5):548-554. |
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| Authors: | GUAN Li LIU Xiangnan |
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| Institution: | 1.Institute of Remote Sensing and GIS, Peking University, Beijing 100871, China;;
2.School of Information Engineering, China University of Geosciences, Beijing 100083, China
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| Abstract: | Based on the thorough analysis of the spectral response mechanism of vegetation indices,which are used widely to retrieve chlorophyll content at present,taking advantage of sample reflectance data of crop canopy,simulated by models PROSPECT+SAIL,the sensitivity differences of these vegetation indices for chlorophyll content are compared and discussed,including Pigment-Specific Simple Ratio a(PSSRa),Pigment-Specific Simple Ratio b(PSSRb),Pigment-Specific Normalized Difference a(PSNDa),Pigment-Specific Normal... |
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| Keywords: | MTVI2 MCARI2 |
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