基于改进光谱角算法的小麦产量监测研究  

Studies Monitoring Yield of Winter Wheat with a Modified Spectral Angle Algorithm

作　　者：吕银亮[1] 李少昆[1,2] 王克如[1,2] 肖春华[1,2] 陈兵[1] 王方永[1] 谢瑞芝[2] 高世菊[2] 

机构地区：[1]新疆生产建设兵团绿洲生态农业重点实验室,新疆石河子832003 [2]中国农业科学院作物科学研究所/农业部作物生理生态与栽培重点开放实验室,北京100081

出　　处：《新疆农业科学》2011年第1期1-5,共5页Xinjiang Agricultural Sciences

基　　金：国家高技术研究发展计划("863"计划)项目(2006AA10Z207;2006AA10A302);国家自然科学基金(30760109);国家科技支撑项目(2007BAH12B02)

摘　　要：【目的】基于小麦生长发育关键时期的近地面高光谱数据和收获实测产量数据,利用改进的光谱角算法进行冬小麦产量估测。【方法】选择2个小麦品种,设置4个氮素水平处理,根据氮素营养对小麦冠层可见光和近红外光谱影响较大的特点,构建监测小麦冠层氮素营养的光谱角算法。【结果】氮素营养对小麦产量差具有比产量更明显的差别,不同小麦品种在不同生育时期和氮素水平下光谱角变化有明显的差异,小麦生育前期的光谱角变化较小,生育后期光谱角增加,末期光谱角降低,不同氮素水平之间表现出N0-2>N0-3>N0-1。光谱角与小麦产量呈明显的二次线性关系,拟和方程决定系数为0.784 4,达到极显著水平。【结论】利用光谱角进行小麦产量监测是可行的。[Objective]The objective of this paper is to estimate the wheat yield using modified spectral angle algorithm based on the datasets of field hyperspectral data and yield measured destructively during critical growth stages. [Method]The field experiments were conducted at Beijing, wheat growing season in 2006 to 2007 involving two cultivars and four nitrogen rates. Based on the characteristics of the canopy reflectance in visible and near infrared regions effected by nitrogen nutrition, the spectral angle algorithm for monitering nitrogen nutrition of canopy wheat was established. [Result] The result showed that nitrogen was more different for wheat yield difference than yield. The spectral angle of different wheat cultivars had significant difference during various growth stages and nitrogen rates, and there were more ehangse at early stage than（that of） later stage. Furthermore, the spectral angle among nitrogen rates were NO - 2 〉 NO - 3 〉 NO - 1. Finally, spectral angle and wheat yield were significant secondary linear relations, and the determination coefficient was 0.784 4. [ Conclusion] Hence, spectral angle may provide effective and feasible means of monitoring wheat yield in field by spectral angle.

关 键 词：小麦 光谱角 产量 

分 类 号：S512.1[农业科学—作物学] S118