The aim of this study is to estimate wintertime emissions of greenhouse gases CO₂, N₂O and CH₄ in two abandoned peat extraction areas (APEA), Ess-soo and Laiuse, and in two Oxalis site-type drained peatland forests (DPF) on nitrogen-rich sapric histosol, a Norway spruce and a Downy birch forest, located in eastern Estonia. According to the long-term study using a closed chamber method, the APEAs emitted less CO₂ and N₂O, and more CH₄ than the DPFs. Across the study sites, CO₂ flux correlated positively with soil, ground and air temperatures. Continuous snow depth > 5 cm did not influence CO₂, but at no snow or a thin snow layer the fluxes varied on a large scale (from −1.1 to 106 mg C m⁻² h⁻¹). In all sites, the highest N₂O fluxes were observed at a water table depth of −30 to −40 cm. CH₄ was consumed in the DPFs and was always emitted from the APEAs, whereas the highest flux appeared at a water table >20 cm above the surface. Considering the global warming potential (GWP) of the greenhouse gas emissions from the DPFs in the wintertime, the flux of N₂O was the main component of warming, showing 3–6 times higher radiative forcing values than that of CO₂ flux, while the role of CH₄ was unimportant. In the APEAs, CO₂ and CH₄ made up almost equal parts, whereas the impact of N₂O on GWP was minor.

中文翻译：

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半干旱的泥炭地冬季温室气体通量

这项研究的目的是估算两个废弃的泥炭采伐区（APEA），Ess-soo和Laiuse以及两个Oxalis场地型排水泥炭地森林（DPF）冬季的温室气体CO ₂，N ₂ O和CH ₄排放）在爱沙尼​​亚东部的富含氮的五味树胶，挪威云杉和霜霉病的桦树林中。根据使用密闭室方法的长期研究，与DPF相比，APEA排放的CO ₂和N ₂ O更少，CH _4则更多。在整个研究地点，CO ₂通量与土壤，地面和气温呈正相关。连续雪深> 5 cm不会影响CO ₂但是，在没有积雪或薄雪层的情况下，通量的变化很大（从-1.1到106 mg C m ^-2 h ^-1）。在所有场所，在地下水位-30至-40 cm处观察到最高的N ₂ O通量。CH ₄在DPF中被消耗，并且始终从APEA中排放，而最高通量出现在高于地面20 cm的地下水位中。考虑到冬季DPF温室气体排放的全球变暖潜能（GWP），N ₂ O的通量是变暖的主要成分，其辐射强迫值是CO _2的3-6倍，而CH ₄的作用并不重要。在APEA中，CO ₂CH ₄几乎相等，而N ₂ O对GWP的影响很小。