干旱地区农业研究Issue(4)：94-97,172,5.DOI:10.7606/j.issn.1000-7601.2015.04.15
基于冠层光谱角算法的小麦氮素营养监测
Monitoring nitrogen content of wheat on basis of an algorithm on the spectral angle of canopy
摘要
Abstract
Nitrogen is an important factor for crop growth and environment .A search for real-time ,rapid and accu-rate monitoring methods on nitrogen nutrition is a necessary approach for precise fertilization and efficiency enhancement . In this paper ,three wheat varieties (Xinchun 6 ,Xinchun 17 and Xinchun 22 ) were selected to investigate the correla-tions between the canopy hyperspectral characteristics at four nitrogen levels and the leaves nitrogen content (LNC ) ,and thereby an improved spectral angle (SA ) could be utilized for prediction of LNC .The spectral angles of wheat canopy by different nitrogen treatments were higher with the nitrogen increased and the best spectral angle model for prediction of leaf nitrogen was y=0 .3999 x0 .3989 .The coefficient of determination R2 was 0 .6870 ,and the RE , RMSE and R2 were 1 .63% ,0 .1609 ,and 0 .7515 ,respectively .Spectral angle was feasible for monitoring differences in leaves nitrogen content ,providing a theoretical basis for precise fertilization in agriculture .关键词
小麦/氮素营养监测/高光谱/光谱角Key words
wheat/nitrogen content/spectral angle分类
农业科技引用本文复制引用
肖春华,吕银亮,刁万英,李少昆,王克如,陈兵,王琼..基于冠层光谱角算法的小麦氮素营养监测[J].干旱地区农业研究,2015,(4):94-97,172,5.基金项目
国家科技支撑计划（2012BH27B04）；国家自然科学基金项目（31071371，31460326，31360302）资助，石河子大学高层人才项目 （）
