Determination of Environmental Factors Influencing Methane Oxidation in a Sandy Landfill Cover Soil
Determination of Environmental Factors Influencing Methane Oxidation in a Sandy Landfill Cover Soil
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DOI：
10.1080/09593332608618586
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发表时间：
2005-01
影响因子：
2.8
通讯作者：
Jeryang Park;S. Moon;Y. Ahn;Jae-Young Kim;K. Nam
中科院分区：
文献类型：
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作者：
Jeryang Park;S. Moon;Y. Ahn;Jae-Young Kim;K. Nam
使用粗糙的土壤作为垃圾填埋场覆盖物是有利的，因为它们可以使生物活动区更好地通风。因此，在本研究中，研究了不同环境条件下的甲烷氧化模式，包括土壤水分、温度以及沙质垃圾填埋场覆盖土壤中NH4+的添加。研究了不同水分含量和不同温度下的甲烷氧化动力学。土壤水分含量为10%(wt/wt)时，甲烷氧化速率最大(19.2-22.4nmolg土壤DW-1min-1)。当含水率大于10%时，AVmax变化不大，但随着含水率的增加，AKm值从5.2 3μM增加到75.2 4 Mm。在含水率为10%时，Vmax与Km的比值最大。CH4氧化速率随培养温度的升高而增加，Q10值为2.57~2.69，最适温度为30℃。在30℃以下和30℃以上，Vmax和Km值均下降。加入不同水平的NH4+导致CH4氧化速率增加或降低，但随着NH4+施用量的增加，所有受试样品中CH4氧化的起始时间都被推迟。在所测试的环境变量中，当沙质土壤被用于垃圾填埋场覆盖时，水分控制似乎是管理甲烷氧化的最重要和最有效的手段。
It is advantageous to use coarse soils as landfill cover because they allow better aeration of the biologically active zone. In this study, therefore, patterns of methane oxidation were investigated under various environmental conditions including soil moisture content, temperature, and the addition of NH4 + in a sandy landfill cover soil. The kinetics of CH4 oxidation was also studied at different moisture contents and temperatures. Soil moisture content of 10% (wt/wt) resulted in the maximum CH4 oxidation rate (19.2-22.4 nmol gsoil DW -1 min-1). A V max value was not significantly different when the moisture content was more than 10%, but a K m value increased from 5.23 to 75.24 μM as the moisture content increased. The ratio of V max to K m was the highest at 10% moisture content. The CH4 oxidation rate increased as the incubation temperature increased, and Q10 values and optimum temperature were determined to be 2.57-2.69 and 30°C, respectively. Both V max and K m values decreased at the temperatures below and above 30°C. The addition of various levels of NH4 + resulted in increased or decreased CH4 oxidation rates, however, the initiation of appreciable CH4 oxidation was delayed with increasing amounts of NH4 + application in all samples tested. Among the environmental variables tested, moisture content control seems to be the most important and an efficient means of managing methane oxidation when sandy soils are used in landfill cover.