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Modeling forest floor contribution to phosphorus supply to maritime pine seedlings in two-layered forest soils

Author

Listed:
  • Jonard, Mathieu
  • Augusto, Laurent
  • Hanert, Emmanuel
  • Achat, David L.
  • Bakker, Mark R.
  • Morel, Christian
  • Mollier, Alain
  • Pellerin, Sylvain

Abstract

The quantitative contribution of the forest floor to P nutrition of maritime pine seedlings was experimentally determined by Jonard et al. (2009) in a greenhouse experiment using the radio-isotopic labeling. To extend the results of the experiment on a known mineral soil, a modeling approach was developed to predict P uptake of maritime pine seedlings growing in a mineral soil covered with a forest floor layer. The classical nutrient uptake model based on the diffusion/mass-flow theory was extended to take into account mineralization of P in dead organic matter, microbial P immobilization and re-mineralization and P leaching. In addition, the buffer power characterizing the P retention properties of the mineral soil was allowed to vary with time and with the P-ion concentration in solution. To account for increasing root competition with time, a moving boundary approach was implemented. According to the model, the forest floor contributed most of the P supply to the seedlings (99.3% after 130 days). Predicted P uptake was consistent with observed P uptake and modeling efficiency was 0.97. The uptake model was then used to evaluate the impact of the P retention properties of the mineral soil on the contribution of the forest floor to P uptake. Simulations showed that the contribution of the forest floor was much lower in the quasi non-reactive soil (45.7%) but rapidly increased with soil P reactivity.

Suggested Citation

  • Jonard, Mathieu & Augusto, Laurent & Hanert, Emmanuel & Achat, David L. & Bakker, Mark R. & Morel, Christian & Mollier, Alain & Pellerin, Sylvain, 2010. "Modeling forest floor contribution to phosphorus supply to maritime pine seedlings in two-layered forest soils," Ecological Modelling, Elsevier, vol. 221(6), pages 927-935.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:6:p:927-935
    DOI: 10.1016/j.ecolmodel.2009.12.017
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    References listed on IDEAS

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    1. Mayer, D. G. & Stuart, M. A. & Swain, A. J., 1994. "Regression of real-world data on model output: An appropriate overall test of validity," Agricultural Systems, Elsevier, vol. 45(1), pages 93-104.
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    Cited by:

    1. Yu, Lin & Zanchi, Giuliana & Akselsson, Cecilia & Wallander, Håkan & Belyazid, Salim, 2018. "Modeling the forest phosphorus nutrition in a southwestern Swedish forest site," Ecological Modelling, Elsevier, vol. 369(C), pages 88-100.

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