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Position: Home > Articles > Relationship of 2100-2300 nm spectral characteristics of wheat canopy to leaf area index and leaf N as affected by leaf water content. Pedosphere 2006,16 (3)

Relationship of 2100-2300 nm spectral characteristics of wheat canopy to leaf area index and leaf N as affected by leaf water content.

作者：

Zhao ChunJiang;Wang JiHua;Liu LiangYun;Huang WenJiang;Zhou QiFa

单位：

;National Engineering Research Center for Information Technology in Agriculture, Beijing 100089, China.

关键词：

adsorption;application rates;canopy;chemical composition;irrigated conditions;leaf area;leaf area index;leaves;nitrogen;nitrogen fertilizers;reflectance;soil water regimes;spectral analysis;spectral data;water content;wheat

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 using extracted spectral characteristics in the 2000-2300 nm region of the short wave infrared (SWI) band. The field experiment was designed utilizing different watering schemes, N fertilizer applications, and cultivars as treatments with sampling on different dates to generate a series of wheat canopy samples with different leaf water content, leaf N contet and LAI. A newly defined spectral index, relative adsorptive index in the 2000-2300 nm region (RAI2000-2300), with R being the reflectance at 2224 or 2054 nm, was utilized. This spectral index, RAI2000-2300, 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 RAI2000-2300 and green LAI and that between RAI2000-2300 and leaf N content decreased as leaf water content increased..

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Relationship of 2100-2300 nm spectral characteristics of wheat canopy to leaf area index and leaf N as affected by leaf water content.

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