THE EFFECT OF FLOODING ON NITROUS OXIDE EMISSIONS FROM AN ORGANIC SOIL
THE EFFECT OF FLOODING ON NITROUS OXIDE EMISSIONS FROM AN ORGANIC SOIL
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DOI：
10.1097/00010694-198109000-00006
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发表时间：
1981-09
期刊：
影响因子：
--
通讯作者：
R. Terry;R. Tate;J. Duxbury
中科院分区：
文献类型：
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作者：
R. Terry;R. Tate;J. Duxbury
为了确定洪水的帕霍基渣土（排水，栽培Histosol）从土壤中的一氧化二氮排放量的影响，我们测量了现场N2 O通量和N2 O在受控实验室条件下培养的土壤样品中产生。在前5天的洪水的领域，以前已被作物甜玉米（玉米L。rugosa），NO3--N水平从68下降到<0.1微克氮每立方厘米。同样，N2 O通量从174克N/公顷/天之前，洪水淹没后约为0。比较通量值和洪水中的N2 O浓度表明，洪水场可能充当了大气N2 O的汇。在淹水前和淹水后的实验室培养样品中，潜在的反硝化速率从淹水前的16.2 μg N/cm 3/d增加到淹水后的31.2 μg N/cm 3/d。而N2 O是主要产品的反硝化作用在土壤样品中收集的洪水之前，很少N2 O积累在样品中收集的淹没领域。在NO3--N和NO2--N浓度分别为100和3毫克/升的存在下，容易减少一氧化二氮在淹水土壤。
To determine the effect of flooding of Pahokee muck (a drained, cultivated Histosol) on nitrous oxide emissions from the soil, we measured field N2O fluxes and N2O produced in soil samples incubated under controlled laboratory conditions. During the first 5 days of flooding of a field that had previously been cropped to sweet corn (Zea mays L. rugosa), the NO3--N levels declined from 68 to <0.1 microgram nitrogen per cubic centimeter. Similarly, the N2O flux decreased from 174 g N/ha/d prior to flooding to approximately 0 after flooding. Comparing the flux values and the N2O concentrations in the flood water suggested that the flooded field may have acted as a sink for atmospheric N2O. In laboratory-incubated samples of the preflood and flooded soils, the potential denitrification rates increased from 16.2 μg N/cm3/day prior to flooding to 31.2 μg N/cm3/d after flooding. Whereas N2O was the major product of denitrification in soil samples collected prior to flooding, very little N2O accumulated in samples collected from the flooded field. Nitrous oxide was readily reduced in the flooded soil in the presence of NO3--N and NO2--N concentrations of 100 and 3 mg/liter, respectively.