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<p>The important factors regulating methane (CH<sub>4</sub>) fluxes in rewetted peatlands such as the vegetation types, water table depths (WTDs) and in situ conditions (pH, redox, soil temperature and moisture) are widely reported, but the impact of light and dark conditions on CH<sub>4</sub> fluxes from multiple vegetation types are understudied. This field study investigated if the CH<sub>4</sub> fluxes from multiple vegetation communities (<i>Sphagnum</i> communities, <i>Eriophorum angustifolium</i>, <i>Molinia caerulea</i>, <i>Typha latifolia</i>, <i>Phragmites australis</i>, <i>Juncus effusus</i>, <i>Calluna vulgaris</i>, <i>Carex rostrata</i> and open water) responded differently to light and dark conditions. Triplicate light and dark measurements of carbon dioxide (CO<sub>2</sub>) and CH<sub>4</sub> fluxes were measured in succession on the same day using the closed chamber method from the above-mentioned vegetation communities from five peatland sites located in the Irish midlands. The field measurements showed that the CH<sub>4</sub> fluxes were higher in light conditions compared to dark conditions for <i>C. rostrata</i> (49.0 ± 18.2 in light, 18.9 ± 7.8 g CH<sub>4</sub> m<sup>−2</sup>&#xa0;h<sup>−1</sup> in dark) and <i>E. angustifolium</i> (25.8 ± 9.1 in light, 11.2 ± 4.4 mg CH<sub>4</sub> m<sup>−2</sup>&#xa0;h<sup>−1</sup> in dark) compared to other vegetation communities. The mixed-effect model results indicated that differences between light and dark measurements were strongly related to CO<sub>2</sub> fluxes. When the vegetation was sequestering CO<sub>2</sub>, CH<sub>4</sub> fluxes increased, conversely, during the respiration only, CH<sub>4</sub> fluxes decreased. Future work should examine the impact of vegetation specific phenological mechanisms that influence CH<sub>4</sub> fluxes in light and dark conditions using multiple years of field data.</p>

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Comparing light and dark chamber measurements of CH4 fluxes in drained and rewetted raised bogs of Ireland

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Stephen Barry,
  • Kenneth A. Byrne,
  • Kenneth Crawford,
  • Michael A. Clancy,
  • Clare O’Doherty,
  • Grainne Heagney,
  • Harry Kelly,
  • Mark McCorry,
  • Hannah Mealy,
  • Brian Mollahan,
  • Matthew Saunders,
  • Amey S. Tilak

摘要

The important factors regulating methane (CH4) fluxes in rewetted peatlands such as the vegetation types, water table depths (WTDs) and in situ conditions (pH, redox, soil temperature and moisture) are widely reported, but the impact of light and dark conditions on CH4 fluxes from multiple vegetation types are understudied. This field study investigated if the CH4 fluxes from multiple vegetation communities (Sphagnum communities, Eriophorum angustifolium, Molinia caerulea, Typha latifolia, Phragmites australis, Juncus effusus, Calluna vulgaris, Carex rostrata and open water) responded differently to light and dark conditions. Triplicate light and dark measurements of carbon dioxide (CO2) and CH4 fluxes were measured in succession on the same day using the closed chamber method from the above-mentioned vegetation communities from five peatland sites located in the Irish midlands. The field measurements showed that the CH4 fluxes were higher in light conditions compared to dark conditions for C. rostrata (49.0 ± 18.2 in light, 18.9 ± 7.8 g CH4 m−2 h−1 in dark) and E. angustifolium (25.8 ± 9.1 in light, 11.2 ± 4.4 mg CH4 m−2 h−1 in dark) compared to other vegetation communities. The mixed-effect model results indicated that differences between light and dark measurements were strongly related to CO2 fluxes. When the vegetation was sequestering CO2, CH4 fluxes increased, conversely, during the respiration only, CH4 fluxes decreased. Future work should examine the impact of vegetation specific phenological mechanisms that influence CH4 fluxes in light and dark conditions using multiple years of field data.