基于冠层反射光谱的夏玉米叶片色素含量估算模型研究

Estimation Models of Summer Maize Leaf Pigment Content Based on Canopy Reflectance Spectra

通过分析不同施氮水平下夏玉米叶片色素含量与冠层光谱反射率及其衍生的比值植被指数(RVI)、归一化植被指数(NDVI)、正交植被指数(MTVI2、MCARI2、SAVI、MSAVI)以及叶绿素吸收比值指数(CARI)之间的关系,建立夏玉米叶片叶绿素a(Chla)、叶绿素b(Chlb)、叶绿素a+b(Chl a+b)和类胡萝卜素(Car)含量估算模型。结果表明:NDVI与夏玉米叶片色素含量的相关性最好,RVI、RVI、CARI位居其次。通过逐步回归分析确立的夏玉米叶片Chla、Chlb、Chl a+b及Car含量的估算模型R2分别为0.790 8、0.832 4、0.808 8和0.761 7,说明利用冠层NDVI可以对夏玉米叶片Chla、Chlb、Chl a+b和Car含量进行可靠的监测。

Through analyzed the relationships among the leaves pigment contents of summer maize and the canopy reflectance of single waveband and ratio vegetation index(RVI),normalized difference vegetation index(NDVI),orthogonal vegetation indices(MTVI2,MCARI2,SAVI,MSAVI) and chlorophyll absorption ratio index(CARI),the models for estimating the content of chlorophyll a(Chla),chlorophyll b(Chlb),chlorophyll a+b(Chl a+b) and carotenoid(Car) were established.The results showed that NDVI had the best correlation with th...