CNR-IBE, National Research Council of Italy, Institute of Bioeconomy, Via Madonna del Piano 10, 50145 Sesto Fiorentino, Italy.
CNR-IBE, National Research Council of Italy, Institute of Bioeconomy, Via Madonna del Piano 10, 50145 Sesto Fiorentino, Italy.
Sci Total Environ. 2022 Oct 10;842:156843. doi: 10.1016/j.scitotenv.2022.156843. Epub 2022 Jun 21.
Urban afforestation is considered a promising nature-climate solution that may contribute to achieve climate neutrality by 2050, since it can increase C-storage and C-sequestration, whilst providing further multiple ecosystem services for citizens. However, the quantification of the CO sequestration capacity that may be provided by an urban forest as well as the capacity to impact the city-level C-balance and offset anthropogenic emissions is a complex issue. Methodological approaches, quantity and quality of information contained in urban tree database, and the level of detail of the planned urban forest can strongly influence the estimation of C-sequestration potential offered by urban forests. In this work, an integrated framework based on emission inventory, tree species/morphology and ecosystem modelling has been proposed for the city of Prato, Italy, a representative medium size European city to: i) evaluate the current C-sequestration capacity of urban trees; ii) upscale such capacity with different afforestation scenarios, iii) compare the sink capacity offered by ecosystems with current and projected anthropogenic emissions. Results indicated that the green areas within the Municipality of Prato can sequester 33.1 ktCO yr under actual conditions and 51.0 ktCO yr under the afforestation scenario which maximize the CO sequestration capacity, offsetting the 7.1 % and 11 % of the total emissions (465.8 ktCO yr), respectively. This study proves that, in the various afforestation scenarios tested, the contribution of urban afforestation to the municipality carbon balance is negligible and that carbon neutrality can only be reached by the substantial decarbonization of emission sectors.
城市造林被认为是一种有前途的自然-气候解决方案，它可以通过增加碳储量和固碳量，同时为市民提供更多的生态系统服务，有助于实现 2050 年的气候中和。然而，量化城市森林可能提供的 CO2 固碳能力，以及对城市级碳平衡产生影响和抵消人为排放的能力是一个复杂的问题。方法学方法、城市树木数据库中包含的数量和质量的信息，以及规划城市森林的详细程度，都可能强烈影响对城市森林固碳潜力的估计。在这项工作中，提出了一个基于排放清单、树种/形态和生态系统建模的综合框架，用于意大利普拉托市，这是一个具有代表性的欧洲中等城市，以：i）评估城市树木的当前碳固存能力；ii）用不同的造林情景扩大这种能力，iii）比较生态系统提供的碳汇能力与当前和预计的人为排放。结果表明，普拉托市的绿地在实际情况下可固碳 33.1 ktCO yr，在最大限度地提高 CO2 固碳能力的造林情景下可固碳 51.0 ktCO yr，分别抵消了总排放量（465.8 ktCO yr）的 7.1%和 11%。这项研究证明，在测试的各种造林情景中，城市造林对市政府碳平衡的贡献可以忽略不计，只有通过减排部门的实质性脱碳，才能实现碳中性。
