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用EXOTECH—100BX四通道野外光谱仪,对成都平原的28块水稻样地、5个水稻品种进行多时象的反射波谱测量,两年的研究表明,在水稻的一定生育期间,其反射波谱,特别是红光波段(0.7～0.8μm)和近红外波段(0.8～1.1μm)的反射率与水稻的最终籽粒产量有着密切的关系.水稻的长势越好,则红光反射率越低,近红外反射率越高.本文通过定量分析,分别回归计算了近红外光和红光波段反射率与水稻产量及构成水稻产量的三要素之间的关系.在实际应用中,光谱植被指数RI(或比值植被指数)和NDVI(归一化植被指数)是进行水稻估产较好的参数,它们不仅部分地消除了光谱测量时环境因素对光谱值的影响,而且与水稻产量有着良好的相关性.研究证明,在水稻的黄熟期,RI指数与其产量的正相关关系明显,且越接近黄熟,估产精度越高.
Using EXOTECH-100BX four-channel field spectrometer, reflectance spectroscopy of multi-temporal images of 28 rice and 5 rice cultivars in Chengdu Plain was conducted. Two years of researches showed that during the certain growth period of rice, the reflectance spectrum, especially The reflectivity of red rice (0.7-0.8μm) and near infrared (0.8-1.1μm) is closely related to the final grain yield of rice.The better the growth of rice, the lower the reflectivity of red light and the near infrared reflectance The higher the rate, the higher the rate.The higher the rate, the higher the rate.The higher the rate, the higher the rate.This paper quantitatively analyzed and calculated the relationship between the near-infrared light and the red band reflectance and the rice yield and the three elements that constitute the rice yield.In practice, the spectral vegetation index RI Index) and NDVI (normalized vegetation index) are good parameters for estimating rice yield, they not only partially eliminate the influence of environmental factors on spectral value during spectroscopy, but also have a good correlation with rice yield. Studies have shown that, At the ripening stage of rice, the positive correlation between RI index and its yield was obvious, and the closer to the ripening, the higher the estimation accuracy.