For two years, we quantified the exchange of carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) at two different large-scale Sphagnum farming sites. At both, peat extraction left a shallow layer of highly decomposed peat and low hydraulic conductivities. One site was characterized by preceding multi-annual inundation and irrigated by ditches, while the other one was inoculated directly after peat extraction and irrigated by ditches and drip irrigation. Further, GHG emissions from an irrigation polder and the effect of harvesting Sphagnum donor material at a near-natural reference site were determined. GHG mitigation potentials lag behind the results of less decomposed sites, although our results were also affected by the extraordinary hot and dry summer 2018. CO₂ exchanges ranged between -0.6 and 2.2 t CO₂-C ha⁻¹ y⁻¹ and were mainly influenced by low water table depths. CH₄ emissions were low with the exception of plots with higher Eriophorum covers, while fluctuating water tables and poorly developing plant covers led to considerable N₂O emissions at the ditch irrigation site. The removal of the upper vegetation at the near-natural site resulted in increased CH₄ emissions and, on average, lowered CO₂ emissions. Overall, best plant growth and lowest GHG emissions were measured at the previously inundated site. At the other site, drip irrigation provided more favourable conditions than ditch irrigation. The size of the area needed for water management (ditches, polders) strongly affected the areal GHG balances. We conclude that Sphagnum farming on highly decomposed peat is possible but requires elaborate water management.

两年来，我们对两个不同的大型泥炭藓养殖场的二氧化碳 (CO ₂ )、甲烷 (CH ₄ ) 和一氧化二氮 (N ₂ O)的交换进行了量化。在这两种情况下，泥炭提取留下了高度分解的泥炭和低水力传导率的浅层。一个场地的特点是在前多年淹没和沟渠灌溉，而另一个场地是在泥炭提取后直接接种并通过沟渠和滴灌灌溉。此外，灌溉圩田的温室气体排放和收获泥炭藓的影响确定了近自然参考地点的供体材料。尽管我们的结果也受到了 2018 年异常炎热干燥的夏季的影响，但温室气体减排潜力落后于分解较少的地点的结果。CO ₂交换范围在 -0.6 和 2.2 t CO ₂ -C ha ^-1 y ^{-1 之间}，主要是受低水位深度的影响。CH ₄排放量很低，除了具有较高Eriophorum 覆盖率的地块，而波动的地下水位和发育不良的植物覆盖率导致沟渠灌溉地点的N ₂ O 排放量相当可观。近自然场地上层植被的移除导致 CH ₄增加排放量，平均而言，降低了 CO ₂排放量。总体而言，在先前被淹没的地点测量了最佳的植物生长和最低的温室气体排放。在另一个地点，滴灌提供了比沟灌更有利的条件。水管理所需区域的大小（沟渠、圩田）强烈影响区域温室气体平衡。我们得出的结论是，在高度腐烂的泥炭上种植泥炭藓是可能的，但需要精心的水管理。