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通过对早稻整个生长期内冠层反射光谱特性动态变化的系统研究表明：①在整个水稻生长期内，水稻冠层反射光谱的比值植被指数（ＲＶＩ）值呈有规律的变化，在抽穗前，随移栽后天数增加，ＲＶＩ值也逐渐增大，至抽穗前达到最大值；而抽穗后，则随着移栽后天数的增加，ＲＶＩ值逐渐下降，至收割前降至最低值；②积温与ＲＶＩ之间存在着较密切的关系，通过对不同生育期积温与ＲＶＩ之间进行的线性回归分析表明，在抽穗前，积温与ＲＶＩ值之间呈极显著正相关；而抽穗后，积温与ＲＶＩ之间呈极显著的负相关。在遥感估产中，这种水稻冠层反射光谱特性的变化对于校正生育期的估产偏差和提高估产精度可能有重要意义
The systematic study on dynamic changes of canopy reflectance spectra during the whole growth period of early rice showed that: (1) The RVI value of rice canopy reflectance showed a regular change throughout the rice growth period. Before heading, With the increase of days after transplanting, the RVI value also increased gradually to reach the maximum value before heading; after heading, the RVI value decreased gradually with the increase of the days after transplanting to the lowest value before harvesting; There was a close relationship between RVI and RVI. The linear regression analysis of accumulated temperature and RVI showed that there was a significant positive correlation between accumulated temperature and RVI before heading. However, RVI showed a significant negative correlation. In remote sensing yield estimation, the change of rice canopy reflectance spectrum may have important significance for correcting the yield error during growth period and improving the yield precision