光谱诊断马铃薯叶片氮素敏感波段的研究

Sensitive Band Ranges of Leaf Spectral Reflectance in Diagnosis of Potato Nitrogen Nutrition

利用Unispec-SC光谱仪测定马铃薯叶片光谱反射率,寻找马铃薯叶片氮含量的敏感波段并计算相应的植被指数。结果表明:在可见光波段范围内,550 nm和580 nm 2个波段的光谱反射率与氮含量的相关性较好;在近红外区域,820 nm、900 nm和1 005 nm 3个波段与氮含量的相关性达到了显著水平。利用上述波段计算植被指数,在1 005 nm和580 nm组合的波段,植被指数与氮含量相关性最好并且以DVI的相关系数最高,r=-0.8994,达到了显著水平。

Based on lea f spectrum reflectance of potatoes tested by Unispec-SC NIRS,sensitive band ranges of leaf nitrogen concentration was identified,and vegetation index was established.Reflectance of two wave bands,550 nm and 580nm,selected from visible light,had a good correlation to nitrogen content of potatoes and the reflectance of three wave bands,820 nm,900 nm and 1005nm,from near infrared light,were significantly correlated to the nitrogen content of potatoes.Vegetation indexes were calculated with the brand range mentioned above and 1005 nm and 580 nm had the high correlation with nitrogen content,with DVI showing the highest correlation,r =-0.8994,which was significant at 0.05 level.