A flexible parametric model for a balanced account of forest carbon fluxes in LCA
A flexible parametric model for a balanced account of forest carbon fluxes in LCA
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DOI：
10.1007/s11367-016-1148-z
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发表时间：
2017-02-01
影响因子：
4.8
通讯作者：
Pizzol, Massimo
中科院分区：
文献类型：
--
作者：
De Rosa, Michele;Schmidt, Jannick;Pizzol, Massimo
目的尽管对林产品生命周期评估(LCA)中随时间变化的碳通量的重要性进行了成熟的辩论，但对碳通量的静态描述仍然很常见。LCA从业者无法获得时间明确的碳通量清单，因为最常用的生命周期清单(LCI)数据库使用静态方法。现有的森林模型通常适用于提供所需详细输入参数的特定研究领域。本文提出了一个简化的参数模型，以获得用于生命周期评价的森林碳通量的时间显式平衡计算。以云杉为例，应用该模型计算了内源和外源碳通量，单位为吨碳/公顷。它的目的是允许用户选择(A)要包括在分析中的碳库(地上和地下碳池，仅地上碳或仅茎中碳)；(B)描述生物量增长的线性或S形动态函数；(C)独立描述地上和地下生物量分解的S型、负指数或线性动态函数；以及(D)森林经营特征，如林分类型、轮伐时间、间伐频率和强度。结果和讨论参数模型提供了单位产品的森林碳通量随时间变化的LCI，同时考虑到LCA从业者可获得的数据通常有限，同时提供了一致和稳健的结果。用更复杂的CO2FIX对案例研究结果进行了验证。该模型通过考虑每个碳库的生物量年降解量和生产量，确保了用户定义的空间和时间范围内的碳平衡。该清单可用于LCA研究，并与经典指标(例如全球变暖潜力)相结合，以准确确定随着时间的推移对气候的影响。结论提出了一种简化、灵活的森林模型，便于在生命周期评价中对生物基产品进行随时间变化的评估。
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.