Climate change affects forest ecosystem processes and related services due to climate variability. These might affect ecosystem functioning, especially productivity. Regarding management issues, mixed stands are considered a relevant option to maintain forest cover and ecosystem services under climate change. However, the possibility to maintain these mixed stands with management actions with positive effects on forest functioning under climate change remains uncertain and deserves further investigations. Relying on a simulation-based study with a forest gap model (ForCEEPS), we thus addressed the following questions: (1) Are monospecific stands vulnerable to climate change? (2) Would mixed stands significantly mitigate climate change effects on forest productivity and wood production under climate change? (3) Would conversion to mixed stand management affect significantly forest productivity and wood production under climate change compare to monospecific management? In this study, we quantified potential climate change effect (using RCP 8.5 and present climate) and management’s effect in the French Alps, focusing on five species (Fagus sylvatica, Abies alba, Picea abies, Pinus sylvestris, and Quercus pubescens). We tested different scenarios, with various composition, structure, or environmental conditions, under climate change. These simulations showed that monospecific stands currently growing in stressful conditions would be vulnerable to climate change. Managing mixed stands or conversion from pure to mixed stands would make it possible to maintain higher productivity in the long term than monospecific stands, depending on the species and the sites considered. Our results will feed into discussion on forest management in the context of climate change.

由于气候变异，气候变化影响森林生态系统过程和相关服务。这些可能会影响生态系统的功能，尤其是生产力。关于管理问题，混交林被认为是在气候变化下维持森林覆盖和生态系统服务的相关选择。然而，在气候变化下通过对森林功能产生积极影响的管理行动来维持这些混合林分的可能性仍然不确定，值得进一步调查。依靠森林差距模型 (ForCEEPS) 基于模拟的研究，我们解决了以下问题：(1) 单种植物是否容易受到气候变化的影响？(2) 在气候变化下，混交林是否会显着减轻气候变化对森林生产力和木材生产的影响？(3) 与单一品种管理相比，转换为混合林分管理是否会显着影响气候变化下的森林生产力和木材生产？在这项研究中，我们量化了法国阿尔卑斯山的潜在气候变化影响（使用 RCP 8.5 和当前气候）和管理的影响，重点是五个物种（Fagus sylvatica、Abies alba、Picea abies、Pinus sylvestris和Quercus pubescens )。我们在气候变化下测试了具有各种成分、结构或环境条件的不同场景。这些模拟表明，目前在压力条件下生长的单一品种林分容易受到气候变化的影响。根据物种和考虑的地点，管理混合林分或从纯林分到混交林分可以长期保持比单种林分更高的生产力。我们的结果将用于讨论气候变化背景下的森林管理。