棉 花 学 报   Cotton Science   2007，19(4)：267-272

Relationship between Pigment Concentrations and Hyperspectral Parameters in Functional Leaves of Cotton
YAO Xia，WU Hua-bing，ZHU Yan，TIAN Yong-chao，ZHOU Zhi-guo，CAO Wei-xing^*
(Nanjing Agricultural University/Hi-Tech Key Laboratory of Information Agriculture of Jiangsu Province，Nanjing 210095，China)

Abstract：Hyperspectral remote sensing is a powerful tool for non-destructively obtaining physiological and biochemical information in field crops. A vegetation index (VI) based on hyperspectral reflectance measures has been proposed as a reliable non-destructive method for quickly estimating pigment concentrations in cotton. To determine the best hyperspectral vegetation index for estimating pigment concentrations in cotton，canopy spectral reflectance (350～2500 nm) data of functional leaves at different growth stages of four cotton cultivars under three nitrogen levels were recorded with FieldSpec Pro FR radiometer in two field experiments，and the corresponding measures were taken on the concentrations of different pigments (chlorophyll a，chlorophyll b，chlorophyll a+b，and total carotenoid) in the functional leaves. Then the relationships of pigment concentrations to characteristics of hyperspectral reflectance in functional leaves were analyzed quantitatively.The results showed that the sensitive hyperspectral wavebands of leaf pigment concentrations in cotton were 550~700 nm. Vegetation indices composed of the sensitive wavebands were significantly correlated to the pigment concentrations in functional leaves，with the best vegetation index as the minimum value of red edge (Lo)，R² value of 0.67 for all cultivars combined. Relationships of pigment concentrations to Lo can be potentially used for non-destructive and real-time monitoring of pigment concentrations in cotton leaves.
Key words：cotton；functional leaf；pigment concentration；hyperspectra；spectral index [Full Text，2437KB]