ADAI, LAETA, Department of Mechanical Engineering, Faculty of Science and Technology, University of Coimbra. Rua Luís Reis Santos, 3030-788, Coimbra, Portugal.
ADAI, LAETA, Department of Mechanical Engineering, Faculty of Science and Technology, University of Coimbra. Rua Luís Reis Santos, 3030-788, Coimbra, Portugal.
J Environ Manage. 2020 Jun 1;263:110292. doi: 10.1016/j.jenvman.2020.110292. Epub 2020 Mar 26.
This article analyzes different forest management strategies to meet the increasing demand of biomass for bioenergy and assesses the resulting global warming implications. Applied to maritime pine forest plantations in Portugal, the assessed strategies are: full harvest of residues (FULL); sustainable and proactive management (SMART); expansion of forest plantations on abandoned farmland (EXP); and biomass import (IMP). A dynamic CO inventory was obtained for each scenario using a parametric stand-level C-flux model adapted to Portuguese conditions, which was then extended to the landscape-level and coupled to a dynamic climate model. The time-adjusted absolute global warming potential (AGWP) was then calculated at both stand and landscape levels, considering the timing of all CO emissions and uptakes (both fossil and biogenic). To test the robustness of the findings, a sensitivity analysis was performed. Results show that, in a supply-constrained context like Portugal, SMART and EXP management strategies can provide important global warming mitigation benefits (GWP < 0), although their supply-response is slow (long-term strategies). On the other hand, FULL and IMP management strategies show moderate to null AGWP reduction potential (0 < GWP < 1), while involving other possible risks (e.g., exacerbated soil erosion, nutrient depletion or uncertain impacts abroad), but their supply-response is fast (short-term strategies). National forest regulations and energy policies should be revised to address the drawbacks related to all management strategies and to unleash the multiple environmental benefits they can provide in the short- and long-term.
本文分析了不同的森林管理策略，以满足生物能源对生物质日益增长的需求，并评估了由此产生的全球变暖影响。应用于葡萄牙的沿海松人工林种植园，评估的策略有：（1）全部收获残留物（FULL）；（2）可持续和积极的管理（SMART）；（3）在废弃农田上扩大森林种植园（EXP）；（4）生物质进口（IMP）。每个情景的动态 CO 清单都是使用适用于葡萄牙条件的参数化林分水平 C 通量模型获得的，然后将其扩展到景观水平，并与动态气候模型耦合。然后，在林分和景观水平上考虑所有 CO 排放和吸收（化石和生物源）的时间，计算经过时间调整的绝对全球变暖潜势（AGWP）。为了检验结果的稳健性，进行了敏感性分析。结果表明，在葡萄牙等供应受限的情况下，SMART 和 EXP 管理策略可以提供重要的全球变暖缓解效益（GWP<0），尽管它们的供应响应缓慢（长期策略）。另一方面，FULL 和 IMP 管理策略显示出适度到零的 AGWP 减排潜力（0<GWP<1），同时涉及其他可能的风险（例如，土壤侵蚀加剧、养分枯竭或国外不确定的影响），但其供应响应迅速（短期策略）。国家森林法规和能源政策应进行修订，以解决与所有管理策略相关的缺点，并释放它们在短期和长期内可以提供的多种环境效益。
