摘要
通过对不同N素营养水平冬小麦冠层光谱特性的田间试验研究,发现红边位移现象:在孕穗期前,红边随施N量增加向长波方向“红移”;孕穗期后“红移”现象基本消失,继而发生“蓝移”。红边参数中红边斜率(dλred)与叶片N累积量(TN.D)、叶绿素含量(CHL.T)、叶绿素密度(CHL.D)的相关关系通过显著性检验,红边面积(∑dλ680-760)和叶片全N含量(N%)的相关关系通过显著性检验,红边位置(λred)、红边斜率、红边面积与叶面积指数有着密切关系,均通过极显著性检验,一些红边参数可作为小麦农学参数估测的简便方法。
Winter wheat canopy spectral reflectance was field measured using spectrometer Field Spec at different nitrogen levels and time periods. Some red-edge parameters including wavelength (λred),amplitude (dλred) and red-edge apex area (∑dλ680- 760)were analyzed for winter wheat leaf chlorophyll (CHL. T), leaf nitrogen content( N % ), leaf area index (LAI) ,accumulated leaf nitrogen content(TN. D), etc. It is found that red-edge positions move to long wavebands till booting stage and then fall back to short bands after booting. A significant correlation is found between dλred and TN. D, CHL. T, and CHL. D. Similar relation exists between ∑dλ,680 - 760 and N %. Red-edge parameters show strong correlation with LAI. It is thus concluded that some red-edge parameters form part of the best remote sensing descriptors.
出处
《中国生态农业学报》
CAS
CSCD
2007年第5期80-83,共4页
Chinese Journal of Eco-Agriculture
基金
中国科学院野外台站基金项目"基于GreenSeeker技术的小麦-玉米氮素实时诊断和精准施肥研究"
河北省科技推广项目(05780125D)
国家科技支撑计划课题(2006BAD10A1203)资助
关键词
冬小麦
冠层光谱
N素营养
红边参数
Winter wheat, Canopy spectra, Nitrogen level, Red-edge parameter