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  • 标题:Carbon Dioxide Exchange on a Northern Boreal Fen
  • 本地全文:下载
  • 作者:Aurela M. ; Lohila A. ; Tuovinen J.-P.
  • 期刊名称:Boreal Environment Research
  • 印刷版ISSN:1239-6095
  • 出版年度:2009
  • 卷号:14
  • 期号:04
  • 出版社:Finnish Limnological Society
  • 摘要:

    Long-term net
    ecosystem CO2 exchange measurements were conducted on a nutrient-rich
    fen in northern Finland using the eddy covariance method. During the three
    measurement years (2006–2008), the mean daytime CO2 flux in July was
    –0.40 mg CO2 m–2 s–1, while in mid-winter
    (January–March) the mean efflux was 0.008 mg CO2 m–2
    s–1. Annual balances of –12, –123 and –216 g CO2
    m–2 a–1 were observed in 2006, 2007 and 2008,
    respectively. It is suggested that the low uptake in 2006 was related to the
    warm and dry conditions during the growing season and the consequent reduction
    in vegetation activity. When compared with two other fens in Finland, there was
    a clear correspondence between the nutrient status, mean pH value, maximum LAI
    and the mid-summer CO2 uptake. A similar pattern was not seen in the
    annual CO2 balance, which correlates more with the growing season
    length.

  • 关键词:Exchange;Carbon Dioxide;Boreals;Ecosystem;Mid-Summer
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