Abstract Rotation forestry including clearcutting is a common method of practising forestry in Fennoscandia. Clearcutting in peatland forests markedly increases environmental loading: leaching of nutrients and methane (CH4) and nitrous oxide (N2O) fluxes from soil. Continuous cover forestry has been suggested as an alternative because it does not include clearcutting but partial harvesting. However, impacts of partial harvesting on greenhouse gas fluxes are not well understood and in peatlands have not been studied at all. We conducted a partial harvest by removing 70% of the total stem volume in a mature nutrient-rich peatland forest in Southern Finland. The aim was to investigate how partial harvesting a peatland forest affects CH4 and N2O balances, and how much different surface types contribute to the balances. We used automatic and manual chamber methods to measure fluxes from both harvest and uncut control site. Fluxes were measured from the forest floor, logging trails, and ditches. Fluxes from these surface types were upscaled to obtain net ecosystem-level fluxes during two post-harvest summers (June–August 2016 and 2017). After the harvest, forest floor CH4 fluxes did not change significantly at the harvested site compared to the control site. However, fluxes at logging trails increased significantly. N2O fluxes increased at the harvest site in the post-harvest years, but so did those at the control site as well. Upscaling CH4 fluxes to ecosystem-level indicated that despite their small area (2.4%), emissions from ditches could be large on ecosystem-scale, but their uncertainty was high, while the logging trail CH4 fluxes (20% of the total area) were small. In contrast, N2O fluxes from ditches were low, but the logging trail fluxes comprised 35–38% of the total surface balance. The overall conclusion is that partial harvesting did not cause considerable changes in CH4 and N2O fluxes from a forestry-drained peatland.

中文翻译：

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部分采伐对排水北方泥炭地森林的 CH4 和 N2O 平衡的影响

摘要 包括伐木在内的轮作林业是芬诺斯坎迪亚地区常见的林业实践方法。泥炭地森林的砍伐显着增加了环境负荷：土壤中养分和甲烷 (CH4) 和一氧化二氮 (N2O) 通量的浸出。连续覆盖林业已被建议作为替代方案，因为它不包括砍伐而是部分采伐。然而，部分采伐对温室气体通量的影响尚不清楚，并且根本没有在泥炭地中进行过研究。我们通过在芬兰南部成熟的营养丰富的泥炭地森林中去除 70% 的总茎体积来进行部分收获。目的是调查部分采伐泥炭地森林如何影响 CH4 和 N2O 平衡，以及不同的表面类型对平衡有多大影响。我们使用自动和手动室方法来测量来自收获和未切割控制点的通量。通量是从森林地面、伐木小径和沟渠测量的。在两个收获后的夏季（2016 年 6 月至 2017 年 8 月和 2017 年）期间，这些表面类型的通量被放大以获得净生态系统水平通量。收获后，与对照地点相比，收获地点的森林地面 CH4 通量没有显着变化。然而，测井径的通量显着增加。收获后几年收获地点的 N2O 通量增加，但控制地点的 N2O 通量也增加。将 CH4 通量放大到生态系统水平表明，尽管沟渠面积较小（2.4%），但在生态系统范围内，沟渠的排放量可能很大，但它们的不确定性很高，而测井轨迹 CH4 通量（占总面积的 20%）很小。相比之下，来自沟渠的 N2O 通量较低，但测井轨迹通量占总地表平衡的 35-38%。总体结论是，部分采伐并未导致来自林业排水泥炭地的 CH4 和 N2O 通量发生显着变化。