Model parameterization to simulate and compare the PAR absorption potential of two competing plant species.

International Journal of Biometeorology
Jörg BendixErwin Beck

Abstract

Mountain pastures dominated by the pasture grass Setaria sphacelata in the Andes of southern Ecuador are heavily infested by southern bracken (Pteridium arachnoideum), a major problem for pasture management. Field observations suggest that bracken might outcompete the grass due to its competitive strength with regard to the absorption of photosynthetically active radiation (PAR). To understand the PAR absorption potential of both species, the aims of the current paper are to (1) parameterize a radiation scheme of a two-big-leaf model by deriving structural (LAI, leaf angle parameter) and optical (leaf albedo, transmittance) plant traits for average individuals from field surveys, (2) to initialize the properly parameterized radiation scheme with realistic global irradiation conditions of the Rio San Francisco Valley in the Andes of southern Ecuador, and (3) to compare the PAR absorption capabilities of both species under typical local weather conditions. Field data show that bracken reveals a slightly higher average leaf area index (LAI) and more horizontally oriented leaves in comparison to Setaria. Spectrometer measurements reveal that bracken and Setaria are characterized by a similar average leaf absorptance. Simulations wi...Continue Reading

References

Oct 6, 2005·Applied Optics·Raymond L Lee, Javier Hernández-Andrés
Apr 7, 2006·International Journal of Biometeorology·J BendixE Beck
May 10, 2006·International Journal of Biometeorology·Xiping WangYuntao Ma
Feb 12, 2009·International Journal of Biometeorology·David Rodríguez de la CruzJosé Sánchez Sánchez

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Citations

Jul 6, 2014·Frontiers in Plant Science·E David Ford

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Software Mentioned

Setaria

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