Abstract:Based on the leaf spectra data measured with LOPEX’93, the authors analyzed the relationship between leaf spectra and leaf biochemical components including leaf chlorophyll and leaf water content. It was showed that leaf chlorophyll was highly correlated with the second derivation of leaf reflectance at wavelengths 700, 670, 600, 500, 490, 440, and 410 nm; similarly, it was also showed that leaf water content was highly correlated with the continuum removed leaf reflectance at wavelengths 2 350, 2 180, 2 130, 2 120, 1 870, and 1 820 nm, which correspond to the absorption features of water in shortwave infrared bands. In addition, the authors found that ND(Normalized Difference) has a higher response to chlorophyll than other spectral indexes and the correlation coefficient is 0.618; Ratio975 has a very high response to water content and the correlation coefficient is up to 0.996. Based on the above evidences, the authors built a model to retrieve leaf chlorophyll and leaf water content through ground measured leaf spectra data and the simulated leaf chlorophyll and leaf water content are very accurate as compared to the ground measurements.
[1] RUAN Wei-li, NIU Zheng(阮伟利,牛 铮). Remote Sensing Information(遥感信息),2003, (72): 5. [2] PU Rui-liang, GONG Peng(浦瑞良,宫 鹏). Hyperspectral Remote Sensing and Its Applications(高光谱遥感及其应用). Beijing: Higher Education Press(北京:高等教育出版社),2000. [3] YAN Chun-yan, NIU Zheng, WANG Ji-hua(颜春燕,牛 铮,王纪华,等). Journal of Remote Sensing(遥感学报),2005,9:742. [4] YAN Chun-yan, LIU Qiang, NIU Zheng, et al(颜春燕,刘 强,牛 铮, 等). Journal of Remote Sensing(遥感学报),2004, 8(4): 300. [5] RUAN Wei-li, NIU Zheng(阮伟利,牛 铮). Journal of the Graduate University of the Chinese Academy of Sciences(中国科学院研究生院学报),2004, 21(1): 78. [6] Han Luoheng. International Journal of Remote Sensing,2005, 26(23): 5235. [7] Shafri Helmi Zulhaidi Mohd, Yusof Mohd Rozni M. European Journal of Scientific Research,2009, 29(3): 404. [8] Kokaly Raymond F, Clark Roger N. Remote Sensing of Environment,1999, 67: 267. [9] Noomen Marleen F, Skidmor Andrew K, van der Meer Freek D, et al. Remote Sensing of Environment,2006, 105: 262. [10] SHI Ji-lin, LIU Shu-zhen, CHEN Gui-zhi(施吉林,刘淑珍,陈桂芝). Computer Numerical Methods(计算机数值方法). Beijing: Higher Education Press(北京:高等教育出版社),2009. [11] ZHANG Liang-pei, ZHANG Li-fu(张良培,张立福). Hyperspectral Remote Sensing(高光谱遥感). Wuhan: Wuhan University Press(武汉:武汉大学出版社),2005. [12] SHEN Yan, NIU Zheng, MIAO Qi-long, et al(沈 艳,牛 铮,缪启龙,等). Nanjing Institute of Meteorology(南京气象学院学报),2006,29(6):833. [13] le Maire Guerric, Franois Christophe, Soudani Kamel, et al. Remote Sensing of Environment,2008, 112: 3846. [14] Moorthy Inian, Miller John R, Noland Thomas L. Remote Sensing of Environment,2008, 112: 2824.