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Comparison of an energy systems mini-model to a process-based eco-physiological model for simulating forest growth

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  • Li, Linjun
  • Tilley, David R.
  • Lu, Hongfang
  • Ren, Hai
  • Qiu, Guoyu

Abstract

The mini-modeling technique that H.T. Odum developed in conjunction with his approach to ecological and energy-based systems principles provides a relatively simple, yet powerful way for simulating ecosystem processes at many scales. However, its simplicity presents limitations that should be articulated. This paper developed a mini-model that simulated the biomass growth and soil organic matter accumulation of three subtropical forest plantations typical of South China to compare its simulated results with field observations and the simulated results of a widely applied process-based model of forest ecosystems (Biome-BGC model). The mini-model's simulated results were close to both the observed values and those of the Biome-BGC model over a 23-year record of early growth (R2>0.90 for biomass). This indicated that when the key ecosystem components, processes and driving forces were fully considered, the mini-model technique could closely emulate the ecosystem processes using only a few equations. Thus, developing a mini-model from ecological and energetic systems principles is a powerful tool for testing and expanding upon general energy principles applicable to many systems and offers the unique opportunity to perform dynamic emergy accounting. Developing a mini-model, on the other hand, can benefit from exploring a complex process-based eco-physiological model, especially to understand ecosystem structure and processes. Compared with process-based ecosystem models, the mini-model does not include specific eco-physiological mechanisms of material production, but simply simulates the ecosystem processes based on the main flows of energy. However, investigation of energy interactions in the mini-model and sensitivity analysis showed that the parameters of the mini-model need to be set within their confidence intervals to avoid errors and, like most simulations, should be validated with field observations before applying the model further. Energy systems mini-models provide the capability to simulate key ecosystem processes and the dynamics of emergy, which can prove useful for evaluating the temporal change in the accumulated value of ecosystems such as forests for environmental accounting purposes.

Suggested Citation

  • Li, Linjun & Tilley, David R. & Lu, Hongfang & Ren, Hai & Qiu, Guoyu, 2013. "Comparison of an energy systems mini-model to a process-based eco-physiological model for simulating forest growth," Ecological Modelling, Elsevier, vol. 263(C), pages 32-41.
    • Handle: RePEc:eee:ecomod:v:263:y:2013:i:c:p:32-41
    DOI: 10.1016/j.ecolmodel.2013.04.019
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    References listed on IDEAS

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    1. Lei, Kampeng & Wang, Zhishi, 2008. "Emergy synthesis and simulation for Macao," Energy, Elsevier, vol. 33(4), pages 613-625.
    2. Tilley, David R., 2011. "Dynamic accounting of emergy cycling," Ecological Modelling, Elsevier, vol. 222(20), pages 3734-3742.
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    1. Weiguo Fan & Wei Yao & Kehan Chen, 2023. "Integrating Energy Systems Language and Emergy Approach to Simulate and Analyze the Energy Flow Process of Land Transfer," Land, MDPI, vol. 12(5), pages 1-24, May.

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