Vegetation composition controls temperature sensitivity of CO2 and CH4 emissions and DOC concentration in peatlands
Vegetation composition controls temperature sensitivity of CO2 and CH4 emissions and DOC concentration in peatlands
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DOI：
10.1016/j.soilbio.2017.01.005
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发表时间：
2017-04
影响因子：
9.7
通讯作者：
Fabien Leroy;S. Gogo;C. Guimbaud;Léonard Bernard-Jannin;Zhen Hu;F. Laggoun‐Défarge
中科院分区：
文献类型：
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作者：
Fabien Leroy;S. Gogo;C. Guimbaud;Léonard Bernard-Jannin;Zhen Hu;F. Laggoun‐Défarge
植物群落改造可能在泥炭地的碳平衡中发挥重要作用。我们研究了蓝藻如何改变以泥炭藓为主的泥炭中生态系统中的 CO2 和 CH4 通量以及 DOC 浓度，以及它们对地下水位、空气和土壤温度的敏感性。与泥炭藓相比，蓝藻的存在显着增加了 CO2 和 CH4 排放量，并降低了 DOC 浓度。温度升高使 DOC 以及 CO2 和 CH4 排放呈指数增加。蓝花莫利尼亚 (Molinia caeruleade) 降低了 CO2 排放的温度敏感性，表明存在更不稳定的底物（根系分泌物），同时它增加了 CH4 排放的温度敏感性，表明产甲烷群落可能发生变化。我们的研究强调了植被变化对泥炭地碳动态的强烈影响。
Plant community modification may play an important role in peatlands’ carbon balance. We investigated howMolinia caeruleaaltered CO2and CH4fluxes and DOC concentration as well as their sensitivity to water table level, air and soil temperature inSphagnum-dominated peat mesocosms. The presence ofMolinia caeruleasignificantly increased CO2and CH4emissions compared toSphagnumand decreased the DOC concentration. The rise in temperature exponentially increased DOC as well as CO2and CH4emissions.Molinia caeruleadecreased the temperature sensitivity of CO2emissions, suggesting the presence of a more labile substrate (root exudates), while it increased the temperature sensitivity of CH4emissions, suggesting a possible change in methanogenic communities. Our study highlights a strong impact of vegetation change on C dynamics in peatlands.