We compared long-term C sequestration in the pools of aboveground portions of live trees, dead wood, and harvested wood products among highly contrasting forest management scenarios on a rotation (30-100 years) and 100-year basis. Average annual net change in C (AAC) and the cumulative sum of net changes in C were calculated using 65 years of data from permanent plots representing contrasting approaches to managing mixed-species stands dominated by shade-tolerant coniferous species on the Penobscot Experimental Forest in Maine, USA. Simulations of tree growth and mortality were used to estimate C pools to 100 years. On a rotation basis and for all pools combined, scenarios with selection cutting had greater AAC than those with shelterwood cutting followed by thinning or with diameter-limit cutting (p < 0.05). For combined pools, the cumulative sum of net changes in C for the unmanaged, selection, and guiding diameter-limit stands was positive for most of the study period. Our results suggest that strategies that maintain overstory stocking levels necessary to regenerate desired species and promote the development of sawlog-sized trees can enhance long-term C sequestration in mixed-species, naturally regenerated northern temperate forests.

我们在轮流（30-100年）和100年的基础上，在高度对比的森林管理方案中比较了活树，枯木和收获的木材的地上部分库中的长期C隔离。C的年平均净变化（AAC）和C的累积净变化总和是使用来自永久性地块的65年数据计算得出的，这些数据代表了管理Penobscot实验林中耐荫针叶树种为主的混合物种林分的对比管理方法。美国缅因州。通过树木生长和死亡率的模拟来估算100年的碳库。在轮换的基础上，对于所有合并的池，选择切割的方案的AAC大于使用锯材切割，随后的细化或直径限制的切割方案（p <0.05）。对于组合池，在整个研究期间的大部分时间内，未管理，选择和指导直径限制站的C净变化的累积总和为正。我们的结果表明，维持所需树种过度蓄积水平以再生所需物种并促进锯木大小树木生长的策略可以增强混合物种，自然再生的北部温带森林的长期碳固存。