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首页> 外文期刊>Soil Biology & Biochemistry >Methane uptake in salt-affected soils shows low sensitivity to salt addition
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Methane uptake in salt-affected soils shows low sensitivity to salt addition

机译：受盐影响的土壤中甲烷的吸收对添加盐的敏感性低

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Methane oxidation in aerated soils is a significant sink for atmospheric methane (CH4). Salt-affected soils are extensively present and constitute about 7% of total land surface. However, our knowledge about CH4 turnover between the atmosphere and the saline soils is very limited. In order to evaluate the potential of CH4 consumption in saline soils, CH4 fluxes were measured in intact cores of the slightly (ECe = 3.2 mS cm(-1)), moderately (ECe = 7.1 mS cm(-1)) and extremely (ECe = 50.7 mS cm(-1) and 112.6 mS cm(-1)) saline soils from the Yellow River Delta, China. CH4 uptake of cores from the slightly saline soil ranged from 14 to 24 mu g CH4-C M-2 h(-1), comparable to those in the non-saline forest soils with similar texture. CH4 uptake of cores from the moderately saline soil was only about 6% of that in the slightly saline soil. CH4 uptake was too low to be measurable in the extremely saline soil. Compared with the non-saline soil, CH4 uptake in the saline soils was much less sensitive to salt, suggesting the higher salt-tolerance of CH4 oxidizers in the saline soil. The result also indicated an underestimate in CH4 uptake for the naturally-occurring saline soils by adding salt to non-saline soils. These results should be useful to study the global CH4 budget and to explore the physiological and ecological characteristics of methanotrophic bacteria in the salt-affected soils
机译：加气土壤中的甲烷氧化是大气甲烷（CH4）的重要汇。受盐影响的土壤广泛存在，约占土地总面积的7％。但是，我们对大气和盐碱土之间CH4转换的知识非常有限。为了评估在盐渍土壤中消耗CH4的潜力，在完好无损的核心（ECe = 3.2 mS cm（-1）），中等（ECe = 7.1 mS cm（-1））和极端（ECe ECe =来自中国黄河三角洲的50.7 mS cm（-1）和112.6 mS cm（-1））盐渍土壤。从弱盐土壤中吸收的核心中的CH4范围为14至24μgCH4-C M-2 h（-1），与质地相似的非盐渍森林土壤中的CH4相当。中度盐渍土中岩心对CH4的吸收仅为轻度盐渍土中CH4的约6％。 CH4吸收太低，无法在盐分极高的土壤中进行测量。与非盐渍土壤相比，盐渍土壤中CH4的吸收对盐分的敏感性低得多，这表明盐渍土壤中CH4氧化剂的耐盐性更高。结果还表明，通过向非盐渍土壤中添加盐分，自然存在的盐渍土壤对CH4的吸收被低估了。这些结果对于研究全球CH4预算以及探讨盐碱化土壤中甲烷营养细菌的生理和生态特征将是有用的。

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