DIURNAL-VARIATION IN METHANE EMISSION IN RELATION TO THE WATER-TABLE, SOIL-TEMPERATURE, CLIMATE AND VEGETATION COVER IN A SWEDISH ACID MIRE
DIURNAL-VARIATION IN METHANE EMISSION IN RELATION TO THE WATER-TABLE, SOIL-TEMPERATURE, CLIMATE AND VEGETATION COVER IN A SWEDISH ACID MIRE
复制标题
甲烷排放量的昼夜变化与瑞典酸性沼泽地的地下水位、土壤温度、气候和植被覆盖率的关系
DOI：
10.1007/bf02180679
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发表时间：
1995-01-01
期刊：
影响因子：
4
通讯作者：
NILSSON, M
中科院分区：
文献类型：
--
作者：
MIKKELA, C;SUNDH, I;NILSSON, M
研究了瑞典北部酸性泥炭沼泽中几种植物群落甲烷排放速率的日变化及其与地下水位深度和宏观气候的关系。在太阳辐射和气温发生日变化的情况下，甲烷通量在白天和夜间是不同的。沼泽植物群落间甲烷排放速率的日变化模式不同。在相对干燥的植物群落(山脊、微营养草坪)，在太阳辐射和气温日变化较大的两个时期，夜间的平均排放速率是白天的2-3倍。在旱地植物群落的所有采样点，甲烷排放量与太阳辐射和土壤温度在5 cm和10 cm之间显著相关(p<；0.05)。在较湿润的植物群落中，白天和夜间的平均甲烷排放速率没有显著差异，尽管在大约70%的采样点甲烷排放与辐射和土壤温度显著相关。在相对干燥的植物群落中，夜间甲烷排放量的增加可能是由于夜间温度较低而抑制了甲烷氧化，或由于厌氧细菌根分泌物的供应延迟，或两者兼而有之。在潮湿植物群落中观察到的模式表明，甲烷的产生与土壤温度或光调控的根分泌物呈正相关。
Diurnal variation in the rate of methane emission and its relation to water table depth and macro climate was studied in several plant communities within an acid, Sphagnum dominated, mixed mire in Northern Sweden. Provided that diurnal variation in solar radiation and air temperature occurred, methane fluxes differed during day and night. Diurnal patterns in methane emission rates were found to differ among mire plant communities. In relatively dry plant communities (ridges, minerotrophic lawn), the average nighttime emission rates were 2-3 times higher than the daytime rates during the two periods with high diurnal variation in solar radiation and air temperature. Methane emission was significantly (p < 0.05) related to solar radiation and soil temperature at depths of 5 and 10 cm at all sampling points in the dry plant communities. In the wetter plant communities, no significant difference between daytime and nighttime average methane emission rates were found even though methane emissions were significantly related with radiation and soil temperature at approximately 70% of the sampling points. The increased emission rate for methane at night in the comparatively dry plant communities was probably caused by an inhibition of methane oxidation, owing to the lower nighttime temperatures or to a delay in the supply of root-exuded substrate for the anaerobic bacteria, or by both. The pattern observed in the wet plant communities indicated that methane production were positively related either to soil temperature or light-regulated root exudation.