Monitoring Canopy Nitrogen Status in Winter Wheat of Growth Anaphase with Hyperspectral Remote Sensing

文献类型： 外文期刊

第一作者： Tang Qiang

作者： Tang Qiang;Li Shao-kun;Wang Ke-ru;Chen Bing;Wang Fang-yong;Diao Wan Ying;Xiao Chun Hua;Tang Qiang;Li Shao-kun;Wang Ke-ru;Xie Rui-zhi;Chen Bing;Wang Fang-yong;Xiao Chun Hua

作者机构：

关键词： Nitrogen richness(NR);Reflectance difference(Delta R);Winter wheat;Model;Monitoring

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.589； 五年影响因子：0.504 ）

ISSN： 1000-0593

年卷期： 2010 年 30 卷 11 期

页码：

收录情况： SCI

摘要： Biomass leaf area Index (LA!) and nitrogen status are important parameters for indicating crop growth potential and photosynthetic productivity in wheat Nondestructive quick assessment of leaf dry weight LAI and nitrogen content is necessary for nitrogen nutrition diagnosis and cultural regulation in wheat production. In order to establish the monitoring model of nitrogen richness in winter wheat of growth anaphase studying the relationship between the nitrogen richness (NR) containing nitrogen density LAI and leaf dry weight and the difference of hyperspectral reflectance rates (Delta R) we conducted a comparable experiment with five winter wheat varieties under nitrogen application level of 0 100 200 and 400 kg N ha(-1) The results indicated the NRs of the different varieties of winter wheat leaves increased with increasing growth stage while in the different nitrogen levels it was sequenced as N0>N3>N1>N2 Twelve vegetation indices were compared with corresponding NR The NR had significantly negative correlation to TCARI and VD672 in those vegetation Indices and their correlations (r) arrived at 0 870 and 0 855 respectively The coefficients of determination (R(2)) of two models were 0 757 and 0 731 by erecting model with the two indexes and NR. Root mean square error (RMSE) relative error (RE) and determination coefficient between measured and estimated NR were employed to test the model reliability and predicting accuracy Accuracy rates of the models based on TCARI and VD672 achieved 84 56% and 80 13% The overall results suggested that leaf nitrogen status of growth anaphase in winter wheat has stable relationships with some vegetation indexes especially index of TCARI and VD672

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