基于冠层反射光谱的玉米LAI和地上干物重估测研究  

Estimation of LAI and Aboveground Dry Biomass in Maize Based on Canopy Spectral Reflectance

作　　者：赵巧丽[1] 郑国清[2] 段韶芬[2] 戴廷波[1] 

机构地区：[1]南京农业大学农学院,江苏南京210095 [2]河南省农业科学院农业经济与信息研究中心,河南郑州450002

出　　处：《华北农学报》2008年第1期219-222,共4页Acta Agriculturae Boreali-Sinica

基　　金：河南省杰出人才创新基金项目(074200510012)

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。The reflectance and LAI of maize canopy and the aboveground dry matter were measured using Zhengdan 958 and Xundan 20 as experiment material. The regression analysis was carrired out to determine the relations of LAI and aboveground dry biomass with RVI and NDVI composed of different wavelengths. The result indicated that the correlation of LAI with NDVI was higher than with RVI, while the power function regression （R950, R650） of NDVI with LAI was the best. However, RVI had significantly binomial correlation with aboveground dry biomass, with a estimating model Y=-0.7224（R800/R650）^2＋1.6316（R800/R650）＋271.49,R^2=0.7935.

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 

分 类 号：S513.01[农业科学—作物学]