A methane flux time series for tundra environments
A methane flux time series for tundra environments
复制标题
苔原环境的甲烷通量时间序列
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
W. Reeburgh
中科院分区：
文献类型：
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作者：
S. Whalen;W. Reeburgh
在代表北极苔原重要组成部分的永久性地点进行了净甲烷通量的季节性测量。这些地点包括羊胡子草草丛、草丛间洼地、苔藓覆盖区和苔草林。甲烷通量表现出较高的昼夜，季节性，网站内，网站之间的变化。结果表明，该地区甲烷释放主要以羊胡子草和苔草为主，年平均净通量分别为8.05 ± 2.50 g CH{sub 4}/sq m和4.88 ± 0.73 g CH{sub 4}/sq m。甲烷通量的苔藓网站和草丛洼地低得多。超过90%的年均甲烷通量从羊胡子草，草丛洼地，苔草网站之间发生解冻和冻结。大约40%的苔藓站点的年平均甲烷通量发生在冬季。草丛冻原和苔草为主的湿草甸冻原环境的合成甲烷通量的加权测量组件通量根据面积覆盖。草丛和湿草甸苔原占估计的全球甲烷排放量为19-33 Tg/年。参考文献39篇，图7，2个标签。
Seasonal measurements of net methane flux were made at permanent sites representing important components of arctic tundra. The sites include Eriophorum tussocks, intertussock depressions, moss-covered areas, and Carex stands. Methane fluxes showed high diel, seasonal, intra site, and between site variability. Eriophorum tussocks and Carex dominated methane release to the atmosphere, with mean annual net methane fluxes of 8.05 + or{minus}2.50 g CH{sub 4}/sq m and 4.88 + or{minus}0.73 g CH{sub 4}/sq m, respectively. Methane fluxes form the moss sites and intertussock depressions were much lower. Over 90% of the mean annual methane flux from the Eriophorum, intertussock depressions, and Carex sites occurred between thaw and freeze-up. Some 40% of the mean annual methane flux from the moss sites occurred during winter. Composite methane fluxes for tussock tundra and Carex-dominated wet meadow tundra environments were produced by weighting measured component fluxes according to areal coverage. Tussock and wet meadow tundra account for an estimated global methane emission of 19-33 Tg/yr. 39 refs., 7 figs., 2 tabs.