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Influence of water table level and soil properties on emissions of greenhouse gases from cultivated peat soil

机译：地下水位和土壤特性对人工泥炭土壤温室气体排放的影响

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A lysimeter method using undisturbed soil columns was used to investigate the effect of water table depth and soil properties on soil organic matter decomposition and greenhouse gas (GHG) emissions from cultivated peat soils. The study was carried out using cultivated organic soils from two locations in Sweden: Oerke, a typical cultivated fen peat with low pH and high organic matter content and Majnegaarden, a more uncommon fen peat type with high pH and low organic matter content. Even though carbon and nitrogen contents differ greatly between the sites, carbon and nitrogen density are quite similar. A drilling method with minimal soil disturbance was used to collect 12 undisturbed soil monoliths (50 cm high, Oe29.5 cm) per site. They were sown with ryegrass (Lolium perenne) after the original vegetation was removed. The lysimeter design allowed the introduction of water at depth so as to maintain a constant water table at either 40 cm or 80 cm below the soil surface. CO sub(2, CH) sub(4) and N sub(2O emissions from the lysimeters were measured weekly and complemented with incubation experiments with small undisturbed soil cores subjected to different tensions (5, 40, 80 and 600 cm water column). CO) sub(2) emissions were greater from the treatment with the high water table level (40 cm) compared with the low level (80 cm). N sub(2O emissions peaked in springtime and CH) sub(4) emissions were very low or negative. Estimated GHG emissions during one year were between 2.70 and 3.55 kg CO sub(2 equivalents m[super]-2. The results from the incubation experiment were in agreement with emissions results from the lysimeter experiments. We attribute the observed differences in GHG emissions between the soils to the contrasting dry matter liability and soil physical properties. The properties of the different soil layers will determine the effect of water table regulation. Lowering the water table without exposing new layers with easily decomposable material would have a limited effect on emission rates.)
机译：使用未扰动土壤柱的溶渗仪方法研究了地下水位深度和土壤性质对耕地泥炭土壤有机质分解和温室气体（GHG）排放的影响。这项研究是使用瑞典两个地点的有机耕地土壤进行的：Oerke，一种典型的低pH和高有机质含量的耕地泥炭，以及Majnegaarden，一种较不常见的高pH和低有机质含量的粉煤泥。即使位置之间的碳和氮含量差异很大，碳和氮的密度也非常相似。使用最小土壤扰动的钻孔方法，每个位置收集了12个原状土壤整料（高50 cm，Oe29.5 cm）。去除原始植被后，用黑麦草（黑麦草）播种。溶渗仪的设计允许在深处引入水，以便在土壤表面以下40厘米或80厘米处保持恒定的地下水位。每周测量一次测渗仪排放的CO sub（2，CH）sub（4）和N sub（2O）排放量，并辅以在不受张力的情况下（5、40、80和600 cm水柱）的小型未扰动土壤核心的孵育实验。与高水位（80 cm）相比，高水位（40 cm）处理的二氧化碳（2）排放量更大。 N sub（2O排放量在春季达到峰值，CH）sub（4）排放量非常低或为负。一年中估计的温室气体排放量为2.70至3.55 kg CO sub（2当量m ^ -2）。孵育实验的结果与溶血仪实验的排放结果相符，我们将观察到的温室气体排放量之间的差异归因于土壤具有不同的干物质特性和土壤物理特性，不同土壤层的特性将决定地下水位调节的效果，降低地下水位而不暴露易腐烂物质的新层将对排放速率产生有限的影响。 ）

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