在河北省沽源县以羊草为主的坝上草原,在降水和刈割为控制因素的试验小区,测量了地上干生物量,并利用 ACS-430手持式光谱仪采集光谱数据,计算了9种植被指数值。对生物量与植被指数进行相关性分析,建立以产量为因变量、植被指数为自变量的生物量估测模型。结果表明,各个植被指数与产量的相关性都很好(P <0.01),说明植被指数对草地覆盖度都很敏感。最后依据曲线模型的决定系数大小,认为归一化红边植被指数 NDRE 与产量建立的二次模型拟合效果最好(P <0.01),拟合方程为 y =0.024+2.249x -7.136x 2,R 2=0.675。%In Bashang Leymus chinensis grassland in Guyuan County in Hebei Province,the dry matter bio-mass in the experiment plots with controlled precipitation and moving intensity was survived,and the nine vege-tation indices was calculated based on the spectrum data of ACS-430 handheld spectroradiometer.The biomass estimation model was set up based on the correlation analysis on biomass and the vegetation index.The results indicated that the vegetation index and biomass were highly correlated(P <0.01),which means the vegetation index was sensitive to grassland coverage.Finally,the NDRE was the best vegetation index to estimate the bio-mass according to the determination coefficient of the curve ,and the estimation equation was (R 2 =0.675).
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