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A New FAPAR Analytical Model Based on the Law of Energy Conservation: A Case Study in China


作者


摘要

The fraction of absorbed photosynthetically active radiation (FAPAR) characterizes the energy-absorption ability of the vegetation canopy. It is a critical input to many land-surface models such as crop growth models, net primary productivity models, and climate models. There is a great need for FAPAR products derived from remote-sensing data. The objective of this research is to develop a new instantaneous quantitative FAPAR model based on the law of energy conservation and the concept of recollision probability (p). Using the ray-tracing method, the FAPAR-P model separates direct energy absorption by the canopy from energy absorption caused by multiple scattering between the soil and the canopy. Direct sunlight and diffuse skylight are also considered. This model has a clear physical meaning and can be applied to continuous and discrete vegetation. The model was validated by Monte Carlo (MC) simulation and field measurements in the Heihe River basin, China, which proved its reliability for FAPAR calculations.


关键词

  • Absorption
  • Biological system modeling
  • China
  • climate models
  • clumping index
  • continuous vegetation
  • crop growth models
  • discrete vegetation
  • energy conservation
  • energy conservation law
  • FAPAR analytical model
  • FAPAR calculations
  • FAPAR model
  • FAPAR-P model
  • FAPAR products
  • fraction of absorbed photosynthetically active radiation
  • fraction of absorbed photosynthetically active radiation (FAPAR)
  • geophysical techniques
  • Heihe River Basin
  • Indexes
  • land-surface models
  • Monte Carlo simulation
  • net primary productivity models
  • Photonics
  • ray-tracing method
  • recollision probability ($hskip0.5ptmbi p$)
  • recollision probability ( $mbi p$ )
  • recollision probability concept
  • Remote sensing
  • remote-sensing data
  • Scattering
  • soil
  • Vegetation
  • vegetation canopy
  • vegetation mapping

引用方式

Fan, Wenjie, Liu, Yuan, Xu, Xiru, Chen, Gaoxing, Zhang, Beitong. A New FAPAR Analytical Model Based on the Law of Energy Conservation: A Case Study in China. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014, 7(9):3945-3955. doi:10.1109/JSTARS.2014.2325673

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