Relationship of 2 100-2 300 nm spectral characteristics of wheat canopy to leaf area index and leaf N as affected by leaf water content

文献类型： 外文期刊

第一作者： Zhao Chun-Jiang

作者： Zhao Chun-Jiang;Wang Ji-Hua;Liu Liang-Yun;Huang Wen-Jiangi;Zhou Qi-Fa

作者机构：

关键词： leaf area index; nitrogen; plant water status; reflectance; Triticum aestivum L.

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2006 年 16 卷 3 期

页码：

收录情况： SCI

摘要： The effects of leaf water status in a wheat canopy on the accuracy of estimating leaf area index (LAI) and N were determined in this study using extracted spectral characteristics in the 2000-2300 nm region of the short wave infrared (SWI) band. A newly defined spectral index, relative adsorptive index in the 2000-2300 nm region (RAI(2000-2300)), which can be calculated by RAI(2000-2300) = (R-2224 - R-2054) (R-2224 + R-2054)(-1) with R being the reflectance at 2224 or 2054 nm, was utilized. This spectral index, RAI(2000-2300), was significantly correlated (P < 0.01) with green LAI and leaf N concentration and proved to be potentially valuable for monitoring plant green LAI and leaf N at the field canopy scale. Moreover, plant LAI could be monitored more easily and more successfully than plant leaf N. The study also showed that leaf water had a strong masking effect on the 2000-2300 nm spectral characteristics and both the coefficient between RAI(2000-2300) and green LAI and that between RAI(2000-2300) and leaf N content decreased as leaf water content increased.

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