关键词: 玉米, 归一化植被指数, Beer-Lambert定律, 消光系数, 叶面积指数

Abstract: In this paper, a simple, quick, non-destructive approach, using remotely sensed normalized difference vegetation index (NDVI), was proposed to rebuild quantitatively Beer-Lambert law, thereafter, by means of statistical analysis, the rebuilt Beer-Lambert law was verified with various years' independent data set. The results indicated that NDVI could give expression to the dynamic variation of plant canopy structural parameters. NDVI increased gradually after sowing of maize, up to 55 days, thereafter, declined sharply towards physiological maturity. At the time of 55 days, the difference in NDVI, LAI and K among the three plant types was the largest, respectively. Additionally, NDVI, LAI and K were different from various LOV (leaf orientation value), respectively. NDVI of flat-type cultivars (LOV≤30°) in reaching saturation point was earlier than the others. It was feasible to rebuild Beer-Lambert law through NDVI, and most suitable for erectophile-type cultivars. Recently, due to more and more erectophile-type cultivars bred by researchers, the rebuilt Beer-Lambert law related to NDVI played a more and more important role in practical application.

Key words: Heterotic groups, Maize(Zea mays L.), Beer-Lambert law, Extinction coefficient, Leaf area index