Water-table changes and nutritional status affect trace gas emissions from laboratory columns of peatland soils
Water-table changes and nutritional status affect trace gas emissions from laboratory columns of peatland soils
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DOI：
10.1016/s0038-0717(97)00074-6
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发表时间：
1997-11-01
影响因子：
9.7
通讯作者：
Ludwig, F
中科院分区：
文献类型：
--
作者：
Aerts, R;Ludwig, F
泥炭地可能在全球三种痕量气体的排放中发挥重要作用：二氧化碳、甲烷和一氧化二氮。我们调查了一个相对较小的降低水位（10厘米）的影响，这些气体的排放使用重新包装，无根泥炭柱在实验室与泥炭从营养丰富（富营养化）的网站和一个更营养贫乏（中营养）的网站，分别。在静态高水位（泥炭表面）的高速率的厌氧CO2生产，这是反映在高（> 1.18）的CO2和CH4的摩尔比。与高静态水位相比，土壤表面以下10 cm的静态水位导致相等（富营养化土壤）或更低的CO2排放（中营养化土壤）。然而，在一个经常变化的水位（0和10厘米以下的泥炭表面），CO2排放量在低水位是1.5（中营养土壤）到3倍（富营养土壤）高水位。从富营养化土壤的CO2排放的最大速率超过了中营养化土壤，除了在静态高水位。甲烷排放量约一个数量级低，在一个静态的低水位相比，静态高水位。泥炭的营养状况对不同地下水位处理的最大甲烷排放量没有明显的影响。泥炭的营养状况有一个深刻的影响，地下水位降低对N2O排放的影响：从富营养化土壤的氧化亚氮排放强烈增加，在低水位，而没有检测到N2O排放的中营养土壤。尽管一个明确的效果，地下水处理的微量气体排放量和土壤中的氧化还原电位，这些变量之间没有显着的相关性被发现在任何土壤类型。(C)1997年爱思唯尔科学有限公司
Peatlands potentially play a significant role in the global emission of three trace gases: carbon dioxide; methane; and nitrous oxide. We investigated the effect of a relatively small lowering of the water-table (10 cm) on the emission of these gases using repacked, root-free peat columns in the laboratory with peat from a nutrient-rich (eutrophic) site and a more nutrient-poor (mesotrophic) site, respectively. At a static high water-table (at the peat surface) high rates of anaerobic CO2 production were found, which were reflected in high (> 1.18) molar ratios of CO2 and CH4. A static water-table of IO cm below soil surface led to equal (eutrophic soil) or lower CO2 emission (mesotrophic soil) compared with the high static water-table. However, at a regularly changing water-table (between 0 and 10 cm below the peat surface), CO2 emission at a low water-table was 1.5 (mesotrophic soil) to 3 times (eutrophic soil) higher than at a high-water table. Maximum rates of CO2 emission from the eutrophic soil exceeded those from the mesotrophic soil, except at a static high water-table. Methane emission was about one order of magnitude lower at a low static water-table compared with the static high water-table. There was no clear effect of the nutritional status of the peat on maximum methane emission in the various water-table treatments. The nutritional status of the peat had a profound influence on the effect of water-table lowering on N2O emission: nitrous oxide emission from the eutrophic soil was strongly increased at a low water-table, whereas there was no detectable N2O emission from the mesotrophic soil. Despite a clear effect of the water-table treatments on both trace gas emissions and on redox potentials in the soil, no significant correlation between these variables was found in either soil type. (C) 1997 Elsevier Science Ltd.