关键词: 小麦, 水分, SPAD值（绿度指数）, 高光谱

Abstract: The leaf spectral reflectance of three nitrogen levels of the two wheat varieties, and three water content treatments was investigated by using of ASD FieldSpec 3 spectra, the SPAD value was determined then to weight the different leaves by using of SPAD-502, the correlation relationship among the spectrum parameters, water content and SPAD value was analyzed by using of ViewSpec Pro and Matlab softwares, in order to define the sensitive bands or spectral index for water content and greenness features of wheat leaves. The results showed that there was close and stable relationship among water index (WI)，water stress index (MSI) and midinfrared simple vegetation index one (MSVI1)（P<0.05）.There was significant relationship between Fd664, SDr/SDb and SPAD value, which indicated that spectral parameters could be used to monitor wheat leaf water content and greenness features.

Key words: Wheat, Water, SPAD value （leaf green index）, Hyperspectral