不同水分处理下冬小麦叶片光谱特征及氮素垂直分布情况分析  

Analysis of spectral characteristics and vertical distribution of nitrogen in winter wheat under different water treatments

作　　者：翟丽婷 魏峰远[1] 冯海宽[2,3,4] 李长春 杨贵军[2,3,4] 吴智超[1,2,3] 刘明星 苗梦珂 Zhai Liting;Wei Fengyuan;Feng Haikuan;Li Changchun;Yang Guijun;Wu Zhichao;Liu Mingxing;Miao Mengke(Henan Polytechnic University,School of Surveying and land Information Engineering,Jiaozuo 454000,China;Key Laboratory of Quantitative Remote Sensing in Agriculture of Ministry of Agriculture,Beijing Research Center forInformation Technology in Agriculture,Beijing 100097,China;National Engineering Research Center for Information Technology in Agriculture,Beijing 100097,China;Beijing Engineering Research Centerfor Agriculture Internet of Things,Beijing 100097,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,焦作454000 [2]农业部农业遥感机理与定量遥感重点实验室,北京农业信息技术研究中心,北京100097 [3]国家农业信息技术工程研究中心,北京100097 [4]北京农业物联网工程技术研究中心,北京100097

出　　处：《中国农业信息》2019年第2期39-54,共16页China Agricultural Informatics

基　　金：国家重点研究发展计划(2016YFD0300602);国家自然科学基金(No.41601346,41871333);河南省科技攻关项目(182102110186)

摘　　要：【目的】为了研究不同水分处理下冬小麦冠层叶片氮素的分布情况。【方法】文章以2014年北京市农林科学院试验田的冬小麦为研究对象,在野外观测实验的支持下,分析不同水分处理下冬小麦氮素垂直分布规律及冠层光谱变化规律,并对不同水分处理下冠层不同叶位光谱指数与叶片氮素进行相关性分析。【结果/结论】在挑旗期W2水分处理下叶片氮素含量最大,而W1、W3、W4、W5随着灌水量增加叶片氮素含量降低,在拔节期上2叶的氮素含量高于上1叶,而到了抽穗期和灌浆期随着叶位的升高氮素含量逐渐升高;对于拔节期未做水分处理时光谱反射率差异性表现为W2>W3>W4>W5>W1。除拔节期外其他生育期随灌水量增加冠层叶片光谱反射率降低;拔节期上1叶在W1、W2水分处理下氮素与光谱指数相关性达显著性水平,最大相关性为0.87,挑旗期上1叶、上3叶、上5叶氮素与光谱指数相关性达显著性水平,最大相关性为0.90,抽穗期上1叶、上2叶、上3叶、上4叶氮素与光谱指数达显著性水平,最大相关性为0.92,灌浆期、上2叶氮素与光谱指数相关性达显著性水平其最大相关性为0.96。[Purpose]To study the distribution of nitrogen in canopy leaves of winter wheat under different water treatments.[Method]The winter wheat of the experimental field of Beijing Academy of Agriculture and Forestry was taken as the research object. Under the support of field observation experiments,the nitrogen of winter wheat under different water treatments was analyzed. The vertical distribution law and the canopy spectral variation law were analyzed, and the correlation between the spectral indices of different leaf positions and leaf nitrogen under different water treatments was analyzed.[Result/Conclusion]Under the W2 water treatment, the nitrogen content of leaves was the highest,while the W1,W3,W4 and W5 decreased with the increase of irrigation water,and the nitrogen content of the upper leaves was higher than that of the previous one. Leaves,and the nitrogen content increased gradually with the increase of leaf position at the heading stage and the filling stage;the difference of spectral reflectance when the joint treatment was not treated with water was W2>W3>W4>W5>W1. In addition to the jointing stage,the nitrogen content of canopy leaves decreased with the increase of irrigation amount;the correlation between nitrogen and spectral index of the first leaf at the jointing stage was significant at W1 and W2,and the maximum correlation was 0.87. At the flag stage,the maximum correlation between the nitrogen level of the first leaf,the upper three leaves and the upper five leaves and the spectral index was 0.90. The nitrogen in the upper leaf,the upper two leaves, the upper three leaves and the upper four leaves at the heading stage. The spectral index reached a significant level with a maximum correlation of 0.92. The maximum correlation between the nitrogen content in the grain filling stage and the upper two leaves and the spectral index reached a significant level of 0.96.

关 键 词：氮素 水分处理 光谱指数 相关性 

分 类 号：S512.11[农业科学—作物学] S127