【摘要】 分析了戈壁针茅荒漠草原不同群落近地面反射光谱特征与产草量的相关关系、初步分析了同一群落类型不同月份近地面估产模型的动态．确认荒漠草原植被指数与产草量的相关性受群落类型、植被指数类型及测定月份的影响．比值植被指数（ＲＶＩ）与标准差植被指数（ＮＤＶＩ）是比较稳定的估产指数，在产量较低的月份，植被指数与产草量之间趋于曲线相关，而在产草量较高的月份，二者之间趋于直线相关．更多还原

【Abstract】 The correlation between the near-ground spectral reflectance characteristics and above ground biomass of different community types and the dynamic of the correlation of the same community in different months for Stipa gobica desert-steppe. are analyzed. It is indicated that the relationship between biomass and Vegetation Index are influenced by the types Of communities,Vegetation indices and the time when the spectral reflectance are measured. It is found that the Ratio Vegetation Index(RVI) and Normalized Difference Vegetation Index(NDVI) are more stable. The correlative forms tend to be curve in the months that biomass are lower and tend to be linear in the months that biomass are higher.更多还原