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土壤圈(英文版)
2006,16
(3)
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Pedosphere
2006,16
(3)
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
作 者：
Chunjiang Zhao;Jihua Wang;Liangyun Liu;Wenjiang Huang;Qifa Zho
单 位：
National Engineering Research Center for Information Technology in Agriculture, Beijing 100089 (China); The State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310012 (China
关键词：
2300;rai2000;leaf n;nm;green lai;30
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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