Chinese Journal of Agrometeorology ›› 2016, Vol. 37 ›› Issue (03): 368-375.doi: 10.3969/j.issn.1000-6362.2016.03.013

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Regional Mapping of Light Use Efficiency for Paddy Rice by Using MODIS Photochemical Reflectance Index

GUO Jian-mao, LIU Jun-wei, TONG Ying-xiang, FEI Dun-yue, WANG Qian   

  1. (1. College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Shouxian Meteorology Bureau, Anhui Provinces, Shouxian 232200
  • Received:2015-10-26 Online:2016-06-20 Published:2016-06-20

Abstract:

 In order to explore the potentiality of the Photochemical Reflectance Index(PRI) in predicting light use efficiency(LUE) at regional scales, eddy covariance flux data of Shouxian station and corresponding MODIS imagery were utilized to establish different models which concerned three formulations of PRIs calculated from a set of alternative reference bands at 488,551,667nm and LUE of site pixel. Then, the optimal model was chosen to create a regional LUE map for paddy rice. The results showed that, the relationships between MODIS PRIs from observations closer to the backscatter direction and LUE were always stronger, and PRI551 exhibited the strongest relationship with LUE among MODIS PRIs. Compared to regional LUE derived using the MOD17 algorithm, more realistic spatial heterogeneity of LUE was appeared in the MODIS PRI551-derived LUE map. Moreover, with multi-temporal imagery and appropriate gap-filling methods be used, MODIS PRI has certain feasibility on long-period and large-area monitoring of ecosystem LUE.Photochemical reflectance index|Light use efficiency| Eddy covariance| MOD17 algorithm| Enhanced vegetation index(EVI)

Key words: Photochemical reflectance index, Light use efficiency, Eddy covariance, MOD17 algorithm, Enhanced vegetation index(EVI)