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采用光谱分析方法对生长在东北黑土上的大喇叭口期春玉米进行了不同施氮量、不同品种的冠层光谱特征研究。结果表明:不同施氮量下玉米冠层全光谱曲线图具有类似的趋势,350~500 nm和640~660 nm波段内反射曲线随着施氮水平的增加呈上升趋势,光谱反射率在不同波段差异较大,在可见光波范围内,350~500 nm波段内N2处理光谱反射率普遍高于其他处理,在500~650 nm附近反射率N0>N3>N2>N1,反射曲线呈先下降后上升趋势排列;在750~1 350,1 450~1 800,2 000~2 350 nm波段内的玉米冠层光谱特征在不同施氮量下也呈现不同的趋势;施氮量对750~1 350,1 450~1 800,2 000~2 350 nm波段内的玉米冠层光谱特征有一定程度的影响;正常施氮量条件下不同品种玉米全光谱曲线在整个波段的趋势均一致,聚类分析显示不同玉米品种在不同波段光谱反射率差异较大。
Spectral analysis was used to study the canopy spectral characteristics of different poplar varieties with different nitrogen rates in the big trumpet stage spring maize growing on the northeast black soil. The results showed that the canopy spectra of maize showed a similar trend under different N application rates. The reflectance curves of 350-500 nm and 640-660 nm bands showed an upward trend with the increase of nitrogen application rate. The spectral reflectance was in different bands The spectral reflectance of N2 treatment in the wavelength range of 350-500 nm was generally higher than that of other treatments in the range of visible light, and the reflectance N0> N3> N2> N1 around 500-650 nm. The reflectance curve first decreased and then increased The spectral characteristics of corn canopy at 750 ~ 1 350,1 450 ~ 1 800,2 000 ~ 2 350 nm showed different trends at different N application rates. The spectral characteristics of corn canopy in 1 450 ~ 1 800 and 2 350 ~ 2 350 nm bands had a certain degree of influence. The trend of the full spectral curve of different varieties of maize under the normal nitrogen application was the same in the whole band. The cluster analysis showed Different corn varieties have different spectral reflectance in different wave bands.