关键词: Malmquist, Malmquist

Abstract:

In order to monitor the wheat stripe rust with hyperspectral remote sensing and estimate the loss of wheat yields. This paper analyzed spectrum and the first derivatives characteristic after infecting wheat stripe rust, the effect of the disease index on yield and yield component factors, the correlation between yield and spectral reflectance, first derivatives spectrum, chose the vegetation index and the first derivatives parameters of the high correlation to built yield simulation equations. The results showed that yields loss increased with the disease index increasing within a certain range. Chose the vegetation index (NDVI and RVI) and the first derivatives parameters (SDr) of the high correlation to build yield simulation equations. The vegetation index NDVI and RVI established multi-temporal combination simulation equation, the equations were fit well, the first derivatives parameters SDr were built yield regression equation of the different growth stages with higher precision. The conclusion of this paper had great practice and application value to monitor the yield under wheat stripe rust stress.