Despite the need for climate change mitigation and altered forest management practices, little is known about the impacts of silvicultural practices such as partial-cuts and clear-cuts on forest ecosystem carbon (C) dynamics. Specifically, the effect of these two overstory treatments on C pools other than the aboveground biomass of trees remains poorly understood. Here, C stocks were estimated for a northern temperate mixed forest located in eastern Québec, Canada, five years after clear-cutting and partial-cutting, either with or without a brushing treatment to control the competing vegetation. The biomass of the aboveground vegetation (trees, saplings, understory), litter and woody debris (coarse, small, fine), as well as the roots (diameter ≤ 1.5 cm) was evaluated. Additionally, soil C pools up to a depth of 35 cm of the mineral soil were assessed. Total ecosystem C stocks were influenced by the overstory treatments reflecting harvest intensities. Although the belowground C pools were major contributors to total ecosystem C stocks, silvicultural treatments only influenced forest floor and aboveground C stocks. However, assessments like the one presented here capture contemporary C stocks, which highlights the need for monitoring to build suitable forest ecosystem C models and to understand long-term C dynamics.

中文翻译：

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不同造林情景下的地上和地下碳储量

尽管需要减缓气候变化并改变森林管理做法，但人们对部分砍伐和全部砍伐等造林做法对森林生态系统碳（C）动态的影响知之甚少。具体而言，这两种上层处理对除树木地上生物量以外的碳库的影响仍知之甚少。这里，对位于加拿大魁北克省东部的北温带混交林的碳储量进行了估算，该森林在砍伐和部分砍伐五年后进行，无论是否进行刷草处理以控制竞争植被。评估了地上植被（树木、树苗、林下植被）、枯枝落叶和木本碎片（粗、小、细）以及根（直径≤1.5厘米）的生物量。此外，还评估了矿质土壤深度达 35 厘米的土壤碳库。生态系统总碳储量受到反映收获强度的植被处理的影响。尽管地下碳库是生态系统总碳库的主要贡献者，但造林处理仅影响森林地面和地上碳库。然而，像这里提出的评估捕​​获了当代碳库，这凸显了监测以建立合适的森林生态系统碳模型和了解长期碳动态的必要性。