%0 Journal Article
%T Estimation of nitrogen concentration in cotton leaf based on canopy reflectance spectra<br>基于冠层反射光谱的棉花叶片氮含量估测
%A ZHU Yan
%A WU Hua-bing
%A TIAN Yong-chao
%A YAO Xia
%A LIU Xiao-jun
%A ZHOU Zhi-guo
%A CAO Wei-xing
%A <br>朱艳
%A 吴华兵
%A 田永超
%A 姚霞
%A 刘小军
%A 周治国
%A 曹卫星
%J 应用生态学报
%D 2007
%I 
%X Through analyzing the relationships of nitrogen concentration in cotton leaf under different nitrogen supply levels with canopy multi-spectral reflectance and its derived ratio vegetation index (RVI, rholambda1/rholambda2), normalized difference vegetation index (NDVI, (rho(lambda1) - rho(lambda2))/(rho(lambda1)) + rho(lambda2)) and differential vegetation index (DVI, rho(lambda1) - rho(lambda2)), the sensitive wave bands and prediction functions of cotton leaf nitrogen concentration were worked out. The vegetation index composed of visible region (610, 660, 680 and 710 nm) and near infrared region (760, 810, 870, 950, 1 100 and 1 220 nm) had a higher correlation with the nitrogen concentration in cotton leaf, and the RVI composed of 950 nm and 710 nm could best predict the leaf nitrogen concentration. The validation with independent field experimental data indicated that RVI (950 nm and 710 nm) -based model was suitable for estimation of leaf nitrogen concentration of different cotton cultivars at their different growth stages.
%K Gossypium hirsutum
%K leaf nitrogen concentration
%K canopy reflectance
%K vegetation index
%K estimation model<br>棉花
%K 叶片氮含量
%K 冠层反射率
%K 植被指数
%K 估测模型
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=B3A6B47DDFBBBE93&yid=A732AF04DDA03BB3&vid=13553B2D12F347E8&iid=F3090AE9B60B7ED1&sid=7E87357967245499&eid=3A9DC0CD8A6F1E57&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=16