Using hyperspectral indices to estimate foliar chlorophyll a concentrations of winter wheat under yellow rust stress
文献类型： 外文期刊
作者： Li Jing 1 ; Jiang Jinbao 1 ; Chen Yunhao 1 ; Wang Yuanyuan 1 ; Su Wei 3 ; Huang Wenjiang 4 ;
作者机构： 1.Beijing Normal Univ, Coll Resources Sci & Technol, Beijing 100875, Peoples R China
2.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
3.China Agr Univ, Coll Informat & Elect Engn, Beijing 100083, Peoples R China
4.Natl Engn Res Ctr Informat Technol Agr, Beijing 100089, Peoples R China
关键词： chlorophyll a; estimation models; hyperspectral; wheat; yellow rust stress
期刊名称：NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH （ 影响因子：2.161； 五年影响因子：1.988 ）
ISSN： 0028-8233
年卷期： 2007 年 50 卷 5 期
页码：
收录情况： SCI
摘要： The canopy hyperspectral reflectance of winter wheat infected with yellow rust at different levels of severity were measured by an ASD FieldSpec Pro FR (TM) spectrometer in the field and the concentrations of chlorophyll a (Chl a) in the leaves corresponding to the spectra were determined by biochemical methods in the laboratory. Correlation analyses were made between Chl a concentrations and canopy hyperspectral data of diseased wheat. Results show that foliar Chl a concentrations are wrongly correlated with canopy spectrum in the visible region and the first-order derivative spectrum in blue edge, green edge, and red edge. Linear and nonlinear models for estimating Chl a concentrations of the diseased wheat were built based on several spectral indices. Results indicate that SDr/SDg, in which SDr and SDg are the sums of the first derivative within red and green edges, outperformed the other indices in predicting Chl a concentrations. The relative estimation errors for Chl a for 12 unseen samples are 17.5%. It is concluded that derivative spectra in red edge and green edge have strong prediction power for foliar Chl a concentrations of diseased winter wheat. Using hyperspectral remote sensing data to monitor crop disease and nutrition status is very promising.
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