摘要： 以cropscan多光谱辐射仪测定了玉米品种郑单958和浚单20的冠层光谱反射率,并对其相应的叶面积指数(LAI)和地上干物质量进行了同步测定。将由近红外波段和可见光红波段组成的不同的归一化植被指数(NDVI)和比值植被指数(RVI)分别与叶面积指数、地上干物质量进行回归分析,结果表明,NDVI与叶面积指数的相关性优于RVI与叶面积指数的相关性,且以NDVI(R₉₅₀,R₆₅₀)和叶面积指数的幂函数回归结果最优;RVI与地上干物质量的二项式回归效果显著,估算模型为:Y=-0.722 4(R₈₀₀/R₆₅₀)²+1.631 6(R₈₀₀/R₆₅₀)+271.49,R²=0.793 5。

关键词: 玉米, 冠层反射光谱, 植被指数, 叶面积指数, 地上干物质量

Abstract: The reflectance and LAI of maize canopy and the aboveground dry matter were measured using Zhengdan958 and Xundan 20 as experiment material. The regression analysis was carrired out to determine the relations of LAI andaboveground dry biomass with RVI and NDVI composed of different wavelengths. The result indicated that the correlationof LAI with NDVI was higher than with RVI,while the power function regression(R₉₅₀,R₆₅₀)of NDVI with LAI was thebest. However,RVI had significantly binomial correlation with aboveground dry biomass,with a estimating model Y=-0.722 4(R₈₀₀/R₆₅₀)²+1.631 6(R₈₀₀/R₆₅₀)+271.49,R²=0.793 5.

Key words: Maize, Canopy reflectance spectrum, Vegetation index, LAI, Aboveground dry biomass

中图分类号: 

• S513.01