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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (11): 2046-2052.doi: 10.3724/SP.J.1006.2008.02046

• RESEARCH NOTES • Previous Articles     Next Articles

Relationship between Fraction of Photosynthetically Active Radiation and Vegetation Indices, Leaf Area Index of Corn and Soybean

YANG Fei12, ZHANG Bai1*,SONG Kai-Shan1,WANG Zong-Ming1,LIU Huan-Jun12,DU Jia12   

  1. 1 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, Jilin; 2 Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2008-03-17 Revised:1900-01-01 Online:2008-11-13 Published:2008-09-06
  • Contact: ZHANG Bai
  • Supported by:

    国家自然科学基金项目(40871187);中国科学院东北振兴科技行动计划重点项目(DBZX-2-030);中国科学院知识创新工程重要方向项目(KZCX-SW-356);中国科学院长春净月潭遥感实验站开放基金

Abstract:

Based on the measured reflectance, photosynthetically active radiation, and leaf area index (LAI), nine common vegetation indices and two vegetation indices, developed by the authors according to the characteristic of reflectance curves and the vegetation index structures, were used to estimate fraction of photosynthetically active radiation (FPAR) in corn (Zea mays L.) and soybean [Glycine max (L.) Merri.]. The relationships between vegetation indices and FPAR differed in different vegetation types. The performances of of near infrared and shortwave bands were better than these of visible and near infrared bands in FPAR estimatin by vegetation indices. Normalized difference vegetation index (NDVI) and ratio vegetation index (RVI) were the best in the vegetation indices calculated by reflectance in visible and near infrared bands for FPAR estimation, with R2 of estimating models 0.82 and 0.81 for corn, both of 0.81 for soybean. Normalized difference shortwave index (NDSI) and ratio shortwave index (RSI) were best in the vegetation indices calculated by near infrared and shortwave bands with almost the same R2 values for NDSI and RSI in corn (0.86) and soybean (0.84). It is suggested that the near infrared and shortwave bands are feasible to be used for FPAR estimation. According to the field experiments, the water content of vegetation canopy had larger effect on FPAR estimation than soil background. The canopy FPAR and LAI showed good logarithm relations in corn and soybean canopy with R2 values of 0.75 and 0.70, respectively, indicating that vegetation indices are better than LAI for FPAR estimation.

Key words: Corn, Soybean, Fraction of photosynthetically active radiation, Vegetation index, Leaf area index

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