不同氮肥条件下冬小麦冠层高光谱特征及红边参数变化  

Characteristics of Canopy Hyperspectral Reflectance and Changes of Red Edge Parameters under Different Nitrogen Levels

作　　者：程晓娟[1,2,3] 李振海[1] 王延仓 宋森楠[1] 冯海宽[1,2] 

机构地区：[1]北京农业信息技术研究中心,北京100097 [2]国家农业信息化工程技术研究中心,北京100097 [3]山东科技大学测绘科学与工程学院,山东青岛266590

出　　处：《湖北农业科学》2014年第5期1004-1009,共6页Hubei Agricultural Sciences

基　　金：国家科技支撑计划项目(2012BAH29B04)

摘　　要：为快速、准确、无损地监测小麦长势和营养状况,对不同氮素处理下4个小麦品种的冠层高光谱信息进行分析,并进行了红边参数与农学组分的相关分析。结果表明,在同一氮肥条件下,同一品种小麦在不同生育期的冠层高光谱反射率差异明显,且在近红外波段的差异大于可见光波段。随着氮肥施用的增加,近红外反射率有明显升高的趋势,而可见光处反射率降低并呈单峰曲线,且随着施氮量的增加反射光谱的红边和绿峰分别发生红移、蓝移。在冬小麦红边参数中,红谷位置、最小振幅及绿峰位置与农学组分之间呈负相关,而其余各红边参数与农学组分之间呈极显著正相关;建立了基于红边振幅的各个组分之间的回归统计模型,且模型较为稳定。Using four wheat cultivars as materials, canopy spectral information under different nitrogen levels was studied. The agronomy components associated with red edge parameters were analyzed for quickly, acurately monitoring growth and nutritional status of wheat. The results showed that the canopy reflectance were different for different cultivars and growth stages in the same amount of nitrogen. The change was more great at near infrared bands than that of the visible lights. Reflectance at near infrared band increased clearly with the increase of nitrogen supply, whereas reflectance at visible band decreased and appeared a curve with one peak. When increasing nitrogen supply, red edge and green peak position of canopy reflectance spectra moved to direction of long wavelength（red light） and short wavelength（blue light）, respectively. The correlations between REP amplitude and agronomic components were better than those between the other red edge parameters and agronomic components. The correlations between Lo, Lwidth and agronomic components were significantly negative. The correlations between other red edge parameters and agronomic components were significantly positive. The regression equations between red amplitude and agronomic components were established. Red edge parameters can provide an important basis for agricultural production by remote sensing means.

关 键 词：冬小麦 氮素水平 冠层高光谱 红边参数 

分 类 号：S512.11[农业科学—作物学] S506.2