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《Journal of Maize Sciences》 2006-03
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Comparison of the Leaf Hyperspectral Reflectance and Absorptance in Relation to the Leaf Pigment Contents in Corn Plants

XIE Rui-zhi1,ZHOU Shun-li2,WANG Ji-hua3,JIANG Hai-rong2(1.Crop Sciences Research Institute,Chinese Academy of Agricultural Sciences,Beijing 100081,China;2.College of Crop Science and Bio-technology,China Agricultural University,Beijing 100094,China;3.National Engineering Research Center for Information Technology in Agriculture,Beijing 100089,China)  
A field experiment was carried out to investigate the relationship between leaf hyperspectral data including reflectance and absorptance and the leaf pigment(chlorophyll a,b and carotenoid) contents in corn plants.One hundred and fifty leaves were analyzed from eleven corn cultivars,three nitrogen level treatments and two population treatments at six growth stages.The wavelength of maximum absorptance value in the chlorophyll-absorbing region lay near 665 nm for the corn leaves.The leaf reflectance at 665 nm was robustly negatively correlated with the leaf absorptance at 665 nm with R2=0.753 3,n=150,and the better relationship was observed when the leaf absorptance at 665 nm was greater than 92%.The eight spectral indices constructed from the near infrared and red or green were not correlated with the leaf pigment if calculated based on the leaf absorptance.The mSR705 and mND705 indices either based on the leaf reflectance or on the leaf absorptance,appeared to be the strongest as related to the leaf pigments.The mSR705 and mND705 based on the absorptance were slightly better related to the leaf pigments than that based on the absorptance.The results in this study implicated that the leaf surface reflectance was the main factor interfering the response of the leaf spectra,especially that of the absorptance spectra,to the change in the leaf pigment content.
【Fund】： 国家“863”项目(2002AA243011);; 北京市科技项目(H010710010123)
【CateGory Index】： S513
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