The area of planted forests increases worldwide and those forests have a potential to contribute to climate change mitigation. Often the genetically improved planting material is used for reforestation, but its potential to accumulate more carbon (C) in biomass through enhanced or faster growth is not fully appreciated. The aim of this study was to investigate variation among native Scots pine and Norway spruce populations in terms of their growth and ability to accumulate C in standing aboveground biomass when transferred into non-local environments. For that purpose we modeled aboveground C in a series of replicated provenance experiments with both species at the age close to half of the rotation. We used the sets of allometric equations and compared the obtained estimates of accumulated C between experimental series and the commercial reference stands of the same species and age.

Significant variation in aboveground C accumulation was found among examined populations, that reached up to 91% for Scots pine and 74% for Norway spruce, depending on testing site. The site-averaged estimates of C accumulation varied between 74.0 (±2.1 s.e.) and 120.0 (±3.7) Mg ha⁻¹ for Scots pine at age 52, and between 37.4 (±3.7) and 184.4 (±5.9) Mg ha⁻¹ for Norway spruce at age 47–53. Those values would be by 23% lower or by 25% higher for pine, and from 9% lower to 11% higher for spruce, depending on the allometric equation used. The accumulated aboveground C was not significantly different at the research sites compared to the nearby reference stands when accounting for differences in stand density. Norway spruce experimental stands had a reduced stand density because of the damage by wind and insects. Those stresses and the observed trends of decreasing stand productivity for spruce populations when transferred to warmer and drier conditions would jeopardize the ability of pure spruce stands to contribute to climate change mitigation in the future. Norway spruce would likely benefit from planting in mixtures with other tree species for increased stand stability and resistance.

The results of our study indicate a possibility to increase C sequestration in forest stands through selective breeding, perhaps linking it with protection of natural forests as an option for climate change mitigation. For increased C sequestration in planted forests the use of seed sources which accumulate biomass faster and in a greater amount would need to be combined with silvicultural operations that maintain proper stand density and structure.

人工林面积增加了全球以及那些森林有潜力，促进减缓气候变化。经常使用的遗传改良种植材料用于造林，但其潜在的通过增强或更快的生长积聚在生物质更多的碳（C）没有完全理解。这项研究的目的是调查时转移到非本地环境中站在地上生物量之间的天然樟子松并在他们的成长和能力积累的C条款变化的挪威云杉人口。为此目的，我们在与年龄接近旋转的一半都种了一系列的复制来源实验模拟地面温度。

在地上ç积累显著的变化进行了检查的人群中，最多时达到91％，对欧洲赤松和挪威云杉74％，这取决于现场测试中发现。Ç聚集的部位平均估计值74.0之间变化（±2.1 SE）和120.0（±3.7）镁公顷^-1为欧洲赤松在52岁之间，以及37.4（±3.7）和184.4（±5.9）镁公顷^-1挪威云杉在47-53岁。根据所使用的异速生长方程，这些值对于松树来说将降低 23% 或升高 25%，对于云杉来说从降低 9% 到升高 11%。占林分密度差异时，累计地上C组不是在研究场所显著不同相比，附近的参考站。挪威云杉实验看台上有因为风和昆虫的损害的降低林分密度。这些应力，当转移到更加温暖和干燥条件云杉人口减少待机效率会危及纯云杉能力的观察到的趋势矗立在将来有助于减缓气候变化。挪威云杉可能会受益于与其他树种混合种植以提高林分稳定性和抵抗力。

我们的研究结果表明，有可能通过选择性育种，以提高林分固碳，或许与天然林保护作为减缓气候变化的选项链接它。为了提高固碳人工林使用其中生物量积累更快，在更大量的种子来源将需要与保持适当的支架的密度和结构造林操作进行组合。