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《Chinese Journal of Applied Ecology》 2004-11
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Relationship between canopy reflectance and plant water status of wheat.

TIAN Yongchao,ZHU Yan,CAO Weixing,DAI Tingbo (Key Laboratory of Crop Growth Regulation' Ministry of Agriculture, Nanjing Agricultural University,Nanjing 210095,China)  
The study on the relationship between canopy reflectance characteristics and plant water status of wheat under different soil water and nitrogen levels showed that the water contents of canopy leaf and plant had a significant correlation with the spectral reflectance of 460~510,610~680,1 480~1 500 and 810~870 nm bands at different growth stages and that of 460~1 500 and 560~1 480 nm bands over the whole growth period.The correlation degrees of canopy leaf(CL),upper-layer leaf(UL) and lower-layer leaf (LL) water content with spectral index were in the order of CLLLUL.In addition,the water contents of canopy leaf and plant after jointing stage were negatively linearly related to the ratio index R(610,560) and spectral index(R(610,560)/ND(810,610)),but positively correlated with the normalized difference index((R 810 -R 610 )/(R 810 +R 610 )),indicating that spectral index(R(610,560)/ND(810,610)) could be a good indicator for monitoring water status in wheat plant.
【Fund】: 国家自然科学基金重点项目 (3 0 0 3 0 0 90 );; 国家“863”计划项目(2 0 0 2AA2 43 0 11);; 高校博士点基金项目 (2 0 0 3 0 70 17);; 江苏省自然科学基资助项目 (BK2 0 0 3 0 79)
【CateGory Index】: S512.1
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