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Simulating canopy photosynthesis for two competing species of an anthropogenic grassland community in the Andes of southern Ecuador

Author

Listed:
  • Silva, Brenner
  • Roos, Kristin
  • Voss, Ingo
  • König, Nicolas
  • Rollenbeck, Rütger
  • Scheibe, Renate
  • Beck, Erwin
  • Bendix, Jörg

Abstract

Tropical mountain forest in the Andes of southeastern Ecuador is regularly destroyed to gain pasture land by cultivating the C4 grass Setaria sphacelata. After recurrent burning of the pastures, the grass is partly outcompeted by the C3 southern bracken (Pteridium arachnoideum). This competition represents the problematic of pasture degradation and increasing deforestation, due to the necessity of new pasture land. Because no information on the growth potential of both species in the Andes of Ecuador is available, a growth simulation model has been improved and properly parameterized with field observations. The measured species- and site-specific physiological and edaphic parameters are presented in this paper, as well as the model validation with field observations of leaf CO2 assimilation. The validation showed deviations of simulated from observed leaf net assimilation lower than 5% of the observed values. The validated model was run with a fully realistic meteorological forcing of the year 2008 (10min time step). The main result points to slightly higher growth potential of Setaria with 5879gm−2a−1, based on an annual CO2 net assimilation rate of 217molCO2m−2a−1. The calculated growth potential of bracken was 5554gm−2a−1, based on the CO2 net assimilation of 197molCO2m−2a−1. In addition, it was shown that decreasing incoming solar radiation and low temperature are favourable weather conditions for bracken in contrary to the pasture grass Setaria.

Suggested Citation

  • Silva, Brenner & Roos, Kristin & Voss, Ingo & König, Nicolas & Rollenbeck, Rütger & Scheibe, Renate & Beck, Erwin & Bendix, Jörg, 2012. "Simulating canopy photosynthesis for two competing species of an anthropogenic grassland community in the Andes of southern Ecuador," Ecological Modelling, Elsevier, vol. 239(C), pages 14-26.
    • Handle: RePEc:eee:ecomod:v:239:y:2012:i:c:p:14-26
    DOI: 10.1016/j.ecolmodel.2012.01.016
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    References listed on IDEAS

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    1. Pachepsky, L. B. & Acock, B., 1996. "An adequate model of photosynthesis -- II. Dependence of parameters on environmental factors," Agricultural Systems, Elsevier, vol. 50(2), pages 227-238.
    2. Göttlicher, Dietrich & Albert, Janina & Nauss, Thomas & Bendix, Jörg, 2011. "Optical properties of selected plants from a tropical mountain ecosystem – Traits for plant functional types to parametrize a land surface model," Ecological Modelling, Elsevier, vol. 222(3), pages 493-502.
    3. Nicolas Vuichard & Philippe Ciais & Luca Belelli-Marchesini & Riccardo Valentini, 2010. "New Parameterization of a Global Vegetation Model for Steppe Ecosystem From Southern Siberian In Situ Measurements," Post-Print hal-00716668, HAL.
    4. Boland, John & Ridley, Barbara & Brown, Bruce, 2008. "Models of diffuse solar radiation," Renewable Energy, Elsevier, vol. 33(4), pages 575-584.
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