小麦叶片氮含量与冠层反射光谱指数的定量关系_李映雪2006.pdfVIP

32 3 　　　 Vol.32, No.3 20063 　358～ 362 ACTA AGRONOMICA SINICA pp.358-362　Mar., 2006 ＊ 李映雪　朱　艳　田永超　姚　霞　秦晓东　曹卫星 ( , 210095) 　:3 3, 。 , , 。 、、, NDVI (1220, 710), 0.80 。 , , , 。、, 。 :;;;; :S512 Quantitative Relationship between Leaf Nitrogen Concentration and Canopy Reflectance Spectra ＊ LI Ying- ue, ZHU Yan, TIAN Yong-Chao, YAO ia, QIN iao-Dong and CAO Wei- ing (Hi-Tech Key Laboratory of Information Agriculture of Jiangsu Province Key Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University,Nanjing 210095, Jiangsu, China) Abstract:Experiment one was conducted with two cultivars (uzhou 26 andHuaimai 18)and fourN application levelsof -1 0, 120, 210 and 300 kg·ha in2001.Experiment twowasdesignedfor one cultivar, Yangmai 10,with three N application -1 levels of 0, 150 and300kg·ha in 2002.Experiment three included four cultivars (uzhou 26, Huaimai 20, Ningmai 9 -1 andYangmai 10)with five nitrogen levels of 0, 75, 150, 225, 300 kg·ha in 2003.On the basis of characterized protein content of these five cultivars, uzhou26andNingmai9were consideredas highand low protein types, respectively, and the other three cultivarswere thought to be medium-protein type. The results showed that the nitrogen concentration in wheat leaves was increased with increasing nitrogen fertilizer, whereas the canopy reflectance was also significantly different under varied nitrogen application.For the different cultivar typeswith low,medium and high grain protein contents, the relationships of leaf nitrogen concentration to NDVI