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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。
The effects of different nitrogen application rates on the pigment content and canopy spectral reflectance and its derived ratio of summer maize (VVI), vegetation index (RVI), normalized vegetation index (NDVI), orthogonal vegetation index (MTVI2, MCARI2, SAVI, MSAVI ) And the chlorophyll absorption ratio index (CARI) were used to establish a model for estimating the contents of Chla, Chlb, Chl a + b and Carotenoids in summer maize leaves. . The results showed that the correlation between NDVI and pigment content of summer maize was the best, followed by RVI, RVI and CARI. The estimated R2 of Chla, Chlb, Chl a + b and Car content of summer maize determined by stepwise regression analysis were 0.790 8, 0.832 4, 0.808 8 and 0.761 7, respectively. Chlb, Chl a + b and Car content for reliable monitoring.