The correlation between LAI and MODIS-VI was analyzed based on 4 years experimental data of spring wheat (2005 -2008 ) and MODIS/Terra data in Yongning national agro-meteorological experiment station. The results showed that there no significant correlation between MODIS-VI and LAI from heading stage to milky stage, but there was significant correlation between MODIS-VI and LAI from 3 - leaf stage to the jointing stage except for the RDSI,NDSI. R2 was 0. 9759, RMSE was 0. 5519, and accuracy was 1. 0745 between the true values and the simulated values. The results indicated that the model had reliability and applicability, which could apply to growth monitoring,yield estimating for spring wheat and parameters adjusting for crop model in future.%利用宁夏灌区典型代表站(永宁站)2005-2008年连续4a的大田春小麦叶面积观测资料和同期MODIS/Terra资料,对LAI(叶面积指数)与10种植被指数(MODIS-VI)间的相关性进行了分析.得出,抽穗-乳熟期所有植被指数与LAI的相关性均不显著,三叶-拔节期和三叶-抽穗期归一化差异光谱指数(NDSI)、再次归一化光谱指数(RDSI)与LAI相关性不显著外,其他指数与LAI均显著相关,因此,用分段函数模拟全生育期LAI才能达到最佳效果.经检验,模拟值与实测值之间直线方程的决定系数(R2)为0.9759,均方根误差(RMSE)为0.5519,准确度(Accuracy)为1.0745,说明模型具有较好的可靠性和适用性,可为今后开展基于LAI参数的春小麦长势监测、遥感估产及作物模型中参数的动态修订等提供参考.
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