This study documents volume increment and natural mortality in 1379 old boreal forests plots during four consecutive inventory cycles in the Norwegian national forest inventory. The stands age up to 100 years beyond recommended rotation length (close to economical optimal rotation length) and comprise a wide range of site productivity classes in both pine- and spruce-dominated forests.

The annual gross volume increment was stable and nearly constant up to 50–100 years beyond economically optimal rotation length. In parallel, there was very low natural mortality (0.22–0.66% of standing volume) with minimal risk of stand collapse. Stands with satisfactory stocking had volume increment equal to or higher than the reference volume increment in managed stands harvested at recommended rotation length, while poorly stocked stands had inferior volume increment.

From a climate change mitigation perspective, it seems to be a good strategy to extend the rotation length beyond what is currently recommended, provided that the stands have satisfactory stocking.

这项研究记录了挪威国家森林清单中连续四个清单周期中1379个北方寒带森林地块的体积增加和自然死亡率。林分年龄超过建议的轮伐长度（接近经济上的最佳轮伐长度）长达100年，并且在以松树为主和以云杉为主的森林中具有广泛的立地生产力水平。

在经济上最理想的轮换长度之外的50–100年内，年度总体积增量保持稳定且几乎恒定。同时，自然死亡率极低（站立站立量的0.22-0.66％），而站立倒塌的风险最小。在推荐的旋转长度下，管理令人满意的林分，其存量令人满意的林分的体积增量等于或大于参考体积的增量，而存积不佳的林分的体积增量则较差。

从减缓气候变化的角度看，如果展台有足够的放养，将轮换长度延长到目前建议的长度以内似乎是一个不错的策略。