| 光谱学与光谱分析 |
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| Monitoring Canopy Nitrogen Status in Winter Wheat of Growth Anaphase with Hyperspectral Remote Sensing |
| TANG Qiang1,2，LI Shao-kun1,2，WANG Ke-ru1,2，XIE Rui-zhi2，CHEN Bing1,2，WANG Fang-yong1,2，DIAO Wan-ying1，XIAO Chun-hua1,2* |
1. Shihezi University，Key Laboratory of Oasis Ecology Agriculture of Xinjiang Construction Crops, Shihezi 832003, China
2. Chinese Academy of Agricultural Sciences，Key Laboratory of Crop Physiology and Production Ministry of Agriculture, Beijing 100081, China |
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Abstract Biomass, leaf area index (LAI) 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 (ΔR), 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 (R2) 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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Received: 2009-12-19
Accepted: 2010-03-22
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Corresponding Authors:
XIAO Chun-hua
E-mail: xiaochunhuaxj@163.com
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