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Tropical mixed-species plantations can outperform monocultures in terms of carbon sequestration and economic return
Ecological Economics ( IF 7 ) Pub Date : 2023-05-12 , DOI: 10.1016/j.ecolecon.2023.107885
Arne Pinnschmidt , Rasoul Yousefpour , Anja Nölte , Marc Hanewinkel

Tropical reforestation is an important strategy to mitigate the global climate crisis through the sequestration of CO2. Together with increasing CO2 prices, carbon storage becomes increasingly relevant for commercial reforestations. Due to higher productivity, mixed-species reforestations have been suggested for carbon plantings. Yet, current studies comparing mixtures and monocultures lack an in-depth comparison of economic and carbon sequestration potentials. Moreover, their economic valuations do not consider carbon payments and differences in forest management. Using a simulation-optimization approach, we compared the economic and carbon sequestration performance of commercial mixed-species stands and monocultures in Costa Rica. Mixed-species stands outperformed their monoculture peers by net present value (NPV) up to 3135 USD/ha if only timber sales were considered, or 3500–16,800 USD/ha if carbon payments were also considered (at a discount rate of 8%). When managed solely for carbon sequestration, the best-performing mixture achieved a mean stand carbon 7% above the best-performing monoculture. The results were sensitive to the comparison baseline applied. The results of this study suggest that tropical mixed-species plantations can be a competitive alternative to monocultures. Forest investors could benefit from establishing mixed-species plantations when reforesting plantation sites where species-specific site suitability is uncertain, or when working with lesser-studied tree species.



中文翻译:

热带混种种植园在固碳和经济回报方面优于单一种植园

热带再造林是通过封存二氧化碳来缓解全球气候危机的重要战略。随着二氧化碳价格的上涨,碳储存与商业再造林的相关性越来越高。由于更高的生产力,混合物种重新造林被建议用于碳种植。然而,目前比较混合物和单一栽培的研究缺乏对经济和碳封存潜力的深入比较。此外,他们的经济估值没有考虑碳支付和森林管理的差异。我们使用模拟优化方法,比较了哥斯达黎加商业混种林和单一栽培林的经济和碳封存性能。如果仅考虑木材销售,混种林的净现值 (NPV) 优于单一栽培林,高达 3135 美元/公顷,如果还考虑碳支付,则为 3500–16,800 美元/公顷(贴现率为 8%) . 当仅针对碳封存进行管理时,表现最好的混合物的平均林分碳比表现最好的单一栽培高 7%。结果对应用的比较基线敏感。这项研究的结果表明,热带混种种植园可以成为单一种植的竞争性替代品。森林投资者可以从建立混种人工林中获益,在特定物种地点适宜性不确定的人工林地重新造林时,或者在与研究较少的树种打交道时。如果还考虑碳支付,则为 800 美元/公顷(折扣率为 8%)。当仅针对碳封存进行管理时,表现最好的混合物的平均林分碳比表现最好的单一栽培高 7%。结果对应用的比较基线敏感。这项研究的结果表明,热带混种种植园可以成为单一种植的竞争性替代品。森林投资者可以从建立混种人工林中获益,在特定物种地点适宜性不确定的人工林地重新造林时,或者在与研究较少的树种打交道时。如果还考虑碳支付,则为 800 美元/公顷(折扣率为 8%)。当仅针对碳封存进行管理时,表现最好的混合物的平均林分碳比表现最好的单一栽培高 7%。结果对应用的比较基线敏感。这项研究的结果表明,热带混种种植园可以成为单一种植的竞争性替代品。森林投资者可以从建立混种人工林中获益,在特定物种地点适宜性不确定的人工林地重新造林时,或者在与研究较少的树种打交道时。这项研究的结果表明,热带混种种植园可以成为单一种植的竞争性替代品。森林投资者可以从建立混种人工林中获益,在特定物种地点适宜性不确定的人工林地重新造林时,或者在与研究较少的树种打交道时。这项研究的结果表明,热带混种种植园可以成为单一种植的竞争性替代品。森林投资者可以从建立混种人工林中获益,在特定物种地点适宜性不确定的人工林地重新造林时,或者在与研究较少的树种打交道时。

更新日期:2023-05-12
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