棉花冠层反射光谱特征研究

Characteristics of reflection spectrum of cotton canopy

研究了棉花品种、氮素用量及种植密度对棉花冠层光谱反射特性的影响。结果表明:棉花冠层光谱反射率在不同生育期间存在明显差异,花铃期前,随着棉花的生长,光谱反射率逐渐增加,花铃期后,光谱反射率逐渐降低;不同棉花品种冠层光谱反射率存在一定差异,缺氮和氮过量处理的冠层光谱反射率在近红外波段差异显著;随着种植密度的提高,光谱反射率在可见光波段降低,近红外波段增加。

The effects of different cotton varieties, nitrogen levels, and plant densities on characteristics of reflection spectrum of cotton canopy were studied. The results of the study showed that there was a marked difference in the reflection rates of spectra of the canopy at different growth stages of cotton. The reflection rates of spectra of the canopy increased before flower and boll stage and decreased after flower and boll stage with the growth of cotton. There were some differences in the reflection rates of spectra of the canopy for different cotton varieties. The reflection rates of spectra of the canopy for the treatments of nitrogen deficiency and over-manured had a marked difference in the near infrared waves. The reflection rates of spectra of the canopy decreased in the near infrared waves and increased in the visible waves with increasing the plant densities.