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A flexible parametric model for a balanced account of forest carbon fluxes in LCA

  • Michele De Rosa
  • Jannick Schmidt
  • Miguel Brandão
  • Massimo Pizzol
LAND USE IN LCA

Abstract

Purpose

Despite a mature debate on the importance of a time-dependent account of carbon fluxes in life cycle assessments (LCA) of forestry products, static accounts of fluxes are still common. Time-explicit inventory of carbon fluxes is not available to LCA practitioners, since the most commonly used life cycle inventory (LCI) databases use a static approach. Existing forest models are typically applied to specific study fields for which the detailed input parameters required are available. This paper presents a simplified parametric model to obtain a time-explicit balanced account of the carbon fluxes in a forest for use in LCA. The model was applied to the case of spruce as an example.

Methods

The model calculated endogenous and exogenous carbon fluxes in tons of carbon per hectare. It was designed to allow users to choose (a) the carbon pools to be included in the analysis (aboveground and belowground carbon pools, only aboveground carbon or only carbon in stem); (b) a linear or sigmoidal dynamic function describing biomass growth; (c) a sigmoidal, negative exponential or linear dynamic function describing independently the decomposition of aboveground and belowground biomass; and (d) the forest management features such as stand type, rotation time, thinning frequency and intensity.

Results and discussion

The parametric model provides a time-dependent LCI of forest carbon fluxes per unit of product, taking into account the typically limited data available to LCA practitioners, while providing consistent and robust outcomes. The results obtained for the case study were validated with the more complex CO2FIX. The model ensures carbon balance within spatial and time delimitation defined by the user by accounting for the annual biomass degradation and production in each carbon pool. The inventory can be used in LCA studies and coupled with classic indicators (e.g. global warming potential) to accurately determine the climate impacts over time. The model is applicable globally and to any forest management practice.

Conclusions

This paper proposes a simplified and flexible forest model, which facilitates the implementation in LCA of time-dependent assessments of bio-based products.

Keywords

Carbon balance Forest carbon cycle Life cycle inventory Life cycle assessment 

Notes

Acknowledgments

This work was funded by Aarhus University through the project ‘Environmental and socioeconomic potential of new concepts and business models for increased production and utilization of biomass from agricultural land in Denmark (ECO-ECO)’. Massimo Pizzol’s contribution to this work was funded by the research grant no. 1305-00030B of the Danish Strategic Research Council. The authors would like to thank the anonymous reviewers for their contributions.

Supplementary material

11367_2016_1148_MOESM1_ESM.xlsb (793 kb)
Appendix (xlsb 793 KB)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of AgroecologyAarhus UniversityAalborgDenmark
  2. 2.Department of Development and PlanningAalborg UniversityAalborgDenmark
  3. 3.New Zealand Life Cycle Management Centre, Institute of Agriculture and EnvironmentMassey UniversityPalmerston NorthNew Zealand

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