Methane emission from small wetlands and implications for semiarid region budgets
Methane emission from small wetlands and implications for semiarid region budgets
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DOI：
10.1029/2004jd005548
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发表时间：
2005-07
影响因子：
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通讯作者：
Zhi-Ping Wang;Xingguo Han;Linghao Li;Q. Chen;Y. Duan;W. Cheng
中科院分区：
文献类型：
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作者：
Zhi-Ping Wang;Xingguo Han;Linghao Li;Q. Chen;Y. Duan;W. Cheng
[1]尽管进行了大量的研究，但在土壤和大气之间不同面积尺度的CH4通量预算中存在很大的不确定性。我们假设小湿地对半干旱区CH4预算的贡献很大，而在半干旱区湿地的贡献通常被认为是微不足道的。为了验证这一假设，本文以内蒙古锡林河流域的小型河岸沼泽为例，进行了每周一次的原位CH4通量测量。2003年7 - 10月，河岸沼泽和高原草地的平均CH4通量分别为234.3和- 1.9 mg CH4 m - 2 d - 1。虽然河岸沼泽仅占锡林河流域的0.4%，但其总CH4排放量约为土地覆被率为89.7%的高地草地CH4消耗量的一半。研究结果表明，半干旱区的CH4预算应包括小湿地的评估。
[1] Despite considerable research, large uncertainties exist in the various area-scales budgets of CH4 flux between soils and the atmosphere. We postulated that small wetlands greatly contribute to the CH4 budget in semiarid regions, where wetland contributions are often assumed to be insignificant. To test this hypothesis, small riparian mires of the Xilin River basin in Inner Mongolia were selected as a case study for weekly measurements of in situ CH4 flux. Average CH4 fluxes were 234.3 and −1.9 mg CH4 m−2 d−1 for the riparian mires and the upland grassland, respectively, during July–October 2003. Although the riparian mires cover only 0.4% of the Xilin River basin, their total CH4 emission was about half of the amount of CH4 consumed by the upland grassland with 89.7% land cover ratio. Our results indicate that estimated CH4 budgets for semiarid regions should include an assessment of small wetlands.