Study on Relationship between New Characteristic Parameters of Spectral Curve and Chlorophyll Content for Rice
XU Xin-gang1, ZHAO Chun-jiang1, WANG Ji-hua1, HUANG Wen-jiang2, LI Cun-jun1, LIU Huan-jun1, 2
1. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China 2. College of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China
Abstract：It is of significance to monitor chlorophyll content with hyperspectral data for crop growth diagnosis in field. In the study, with the point of view that spectral curve shapes display “tall, low, fat and thin” morphological changes, we proposed some new characteristic parameters from spectral curve such as the ascensive or degressive velocities of segments composing peak or valley shapes in spectral curve, and angles formed by the lines fitting the segments of two sides of peak or valley curves, and used the normalized spectra to analyze correlation between these parameters and rice chlorophyll content. The result shows that (1) there is a good negative correlation between rice chlorophyll content and normalized reflectance spectra from 520-740 nm ; (2) characteristic parameters from green peak region of spectral curve display better correlation with rice chlorophyll content, which makes it possible to utilize the parameters to monitor crop chlorophyll content, and will provide new ideas and methods for carrying out crop growth diagnosis with hyperspectral data.
Key words：Characteristic parameter of spectral curve;Velocities of change;Angle;Chlorophyll content
徐新刚1，赵春江1，王纪华1，黄文江1，李存军1，刘焕军1, 2 . 新型光谱曲线特征参数与水稻叶绿素含量间的关系研究 [J]. 光谱学与光谱分析, 2011, 31(01): 188-191.
XU Xin-gang1, ZHAO Chun-jiang1, WANG Ji-hua1, HUANG Wen-jiang2, LI Cun-jun1, LIU Huan-jun1, 2 . Study on Relationship between New Characteristic Parameters of Spectral Curve and Chlorophyll Content for Rice . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(01): 188-191.
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