水稻氮素营养水平与光谱特性的关系

A preliminary study on the relationship between the nitrogen levels and the spectral characteristics of early rice leaves.

用土培方法培养出5个不同氮素营养水平的早稻,测定了不同生育期单张叶片的光谱曲线,对盆栽水稻群体进行了多光谱摄影及彩色红外摄影。对叶片氮素营养水平与光谱特性的关系进行了分析,结果表明:缺氮处理及正常氮水平处理的早稻单张叶片的光谱特征明显不同,运用适宜的光谱分类统计量,可以对早稻的氮素水平进行光谱分类,ND和RVI等植被指数与稻叶含氮量之间有良好的相关性。对影象进行目视解译及图象处理,发现用蓝、绿、红波段的多光谱影象解译早稻的氮素营养状态的效果不佳,而用彩色红外影象解译则效果较好。

Pot experiment was conducted to study the characteristics of reflective spectrum of the single leaf and the multispectral images and colour infrared images of early rice plants of different nitrogen levels. The main results are summarized as follows:① the characteristic of reflective spectrum of the single rice leaf deficient in nitrogen is significantly different from that of normal leaf. The nitrogen levels of early rice plants can be classified successfully by using some spectral statistics.② the vegetation indexes such as ND, RVI are highly correlated with the nitrogen contents of early rice leaves. ③ the colour infrared image can be successfully used to analyse the nitrogen nutrition status of early rice plants.