| 光谱学与光谱分析 |
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| Effects of N, K Fertilization on the Relationship between Photosynthetic Light Use Efficiency and Photochemical Reflectance Index (PRI) |
| WU Chao-yang1,2,NIU Zheng1,TANG Quan1,2,HUANG Wen-jiang3 |
1. The State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China
2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
3. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China |
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Abstract PRI (Photochemical reflectance index) has provided a fast and reliable method for estimating photosynthetic light use efficiency across species. Increasing efforts have been paid to explore the effects of such disturbances as water content and CO2 concentration on the relationship between PRI and LUE. In the present paper, five types of wheat with different nitrogen and kalium fertilization were selected to study the influence of varied fertilization levels on the relationship between PRI and LUE. The results proved that leaf chlorophyll contents as well as canopy PRI increased with the increase in nitrogen and kalium fertilization. For all the nitrogen and kalium fertilization of wheat, the regression coefficients R2 are 0.710 4 and 0.853 4 respectively. When considering different levels of fertilization, the regression coefficients R2 are 0.602 0, 0.640 4 and 0.801 4 for three types of nitrogen fertilization, and 0.379 1, 0.640 4 and 0.676 9 for kalium fertilization. Therefore, PRI not only can be a reliable indicator of LUE but also can reflect the fertilization situation of wheat with different precisions of LUE assessment which can provide important reference for management and precision agriculture.
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Received: 2007-11-02
Accepted: 2008-02-08
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Corresponding Authors:
WU Chao-yang
E-mail: hefery@163.com
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