Plant chlorophyll is the material basis of plant photosynthesis .In order to investigate the response of rice canopy spectrum and chlorophyll content in different growth stages ,the canopy spectral reflectance and chlorophyll con-tent of canopy were measured using the rice plot in Ningxia Irrigation Zone of China .The relationship between canopy spectral reflectance and chlorophyll content was analyzed .The correlation between canopy spectral reflectance and chloro-phyll content decreased with the growth period , and the correlation between the canopy spectral reflectance and the canopy reflectance of the canopy was significantly decreased in different growth stages .Based on the normalized vegeta-tion index (NDSI) where steam elongation (NDSI(456 ,475 ) ,R2=0 .6502) ,heading (NDSI(748 ,782) ,R2=0 .5264) ,milk grain (NDSI(822 ,823) ,R2=0 .5708) ,dough grain (NDSI(730 ,731) ,R2=0 .4396) could be used to predict the chlorophyll content of rice canopy .%叶绿素是植物光合作用的物质基础.为了探讨不同生育期水稻冠层光谱与叶绿素含量的响应规律,以宁夏引黄灌区水稻为材料,经小区试验测定水稻冠层光谱与叶绿素含量,分析冠层光谱反射率与叶绿素含量的相关性,建立两者之间的相关模型,结果表明:不同生育期内,水稻冠层光谱反射率差异较大;水稻冠层光谱反射率与叶绿素含量相关性随着生育期的推进而逐渐降低;基于全波段归一化光谱指数(NDSI)构建的拔节期(ND-SI(456,475),R2=0.6502)、抽穗期(NDSI(748,782),R2=0.5264)、乳熟期(NDSI(822,823),R2=0.5708)、蜡熟期(NDSI(730,731),R2=0.4396)叶绿素模型能较好地预测水稻冠层叶绿素含量.
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