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A New Normalized Difference Index for Estimating Leaf Area Index of Wheat Under Yellow Rust Stress

文献类型： 外文期刊

作者： Jiang, Jinbao 1 ; Chen, Yunhao 2 ; Huang, Wenjiang 3 ; Li, Yifan 1 ;

作者机构： 1.China Univ Mine & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China

2.Beijing Normal Univ, Coll Resources Sci & Technol, Beijing 100875, Peoples R China

3.Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

关键词： Hypersprectral Remote Sensing; LAI; Normalized Difference Index; Sensitivity and Saturation Analysis; Inversion Model

期刊名称：SENSOR LETTERS （ 影响因子：0.558； 五年影响因子：0.58 ）

ISSN： 1546-198X

年卷期： 2012 年 10 卷 1-2 期

页码：

收录情况： SCI

摘要： The aim of this paper is to design a new normalized difference vegetation index, which is insensitive to pigment contents and relative water contents, but is sensitive to leaf area index (LAI). The canopy reflectance of winter wheat which was infected with yellow rust of different severities, and the LAI, canopy chlorophyll density (CCD) and relative water contents (RWC) of the whole wheat were measured respectively. Through regression analysis and test, the result indicated NDVI, (SDr - SDb)/(SDr + SDb) and (R-900 - R-1450)/(R-900 + R-1450) had high precision for estimating LAI. The sensitive relationship had been analyzed between above three indices and CCD and RWC, respectively, the result showed the near-infrared (NIR) and short-wave-infrared (SWIR) normalized difference index (R-900 - R-1450)/(R-900 + R-1450) was most insensitive to CCD and RWC. Moreover, the index was not easiest to get to the saturation level than the other two indices. Therefore, the index (R-900 - R-1450)/(R-900 + R-1450) is a relatively good index for the estimation of wheat LAI, and the model determination coefficient (R-2) is 0.7924, and RMSE is 0.59, and relative error is 23.6%. This study not only provides a new method for the estimation of LAI by using hyperspectral remote sensing, but also offers technology and information support for precision agriculture.

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