Growing season methane emission from a boreal peatland in the continuous permafrost zone of Northeast China: effects of active layer depth and vegetation
Growing season methane emission from a boreal peatland in the continuous permafrost zone of Northeast China: effects of active layer depth and vegetation
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中国东北连续多年冻土带北方泥炭地生长季甲烷排放：活动层深度和植被的影响
DOI：
10.5194/bg-9-4455-2012
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发表时间：
2012-11
期刊：
影响因子：
4.9
通讯作者：
R. Mao
中科院分区：
文献类型：
--
作者：
Y. Miao;C. Song;L. Sun;X. Wang;H. Meng;R. Mao
抽象的。北方泥炭地是甲烷的重要天然来源，特别容易受到气候突变的影响。然而，北方泥炭地CH4排放的控制因素仍不清楚。在这项研究中，我们调查了2010年和2011年中国东北连续多年冻土区以灌木、水苔和莎草为主的植物群落的CH4通量和非生物因素（温度、地下水位深度、活性层深度和孔隙水中溶解的CH4浓度）。我们研究的目的是研究植被类型和非生物因素对北方泥炭地 CH4 通量的影响。在以枇杷为主的群落中，2010 年和 2011 年平均 CH4 排放量分别为 1.02 和 0.80 mg m−2 h−1。以灌木苔藓为主的群落释放的CH4通量（0.38 mg m−2 h−1）低于以Eriophorum为主的群落。此外，在以Eriophorum为主的群落中，CH4通量表现出显着的时间模式，在2010年和2011年8月下旬达到峰值。然而，在灌木苔藓为主的群落中，CH4通量没有观察到明显的季节变化。有趣的是，在以刺毛藻和灌木水苔为主的群落中，CH4通量与空气或土壤温度和地下水位深度没有表现出密切的相关性，而CH4排放量与活性层深度和土壤孔隙水中的CH4浓度密切相关，特别是在以刺毛藻为主的群落中。我们的研究结果表明，解冻的富含 CH4 的永久冻土层释放的 CH4 可能是控制北方泥炭地 CH4 排放的关键因素，并强调 CH4 通量随北方泥炭地植被类型的不同而变化。随着未来气候模式中温度的升高，该地区活动层深度的增加和植物功能群的变化可能会对 CH4 排放产生重大影响。
Abstract. Boreal peatlands are significant natural sources of methane and especially vulnerable to abrupt climate change. However, the controlling factors of CH4 emission in boreal peatlands are still unclear. In this study, we investigated CH4 fluxes and abiotic factors (temperature, water table depth, active layer depth, and dissolved CH4 concentrations in pore water) during the growing seasons in 2010 and 2011 in both shrub-sphagnum- and sedge-dominated plant communities in the continuous permafrost zone of Northeast China. The objective of our study was to examine the effects of vegetation types and abiotic factors on CH4 fluxes from a boreal peatland. In an Eriophorum-dominated community, mean CH4 emissions were 1.02 and 0.80 mg m−2 h−1 in 2010 and 2011, respectively. CH4 fluxes (0.38 mg m−2 h−1) released from the shrub-mosses-dominated community were lower than that from Eriophorum-dominated community. Moreover, in the Eriophorum-dominated community, CH4 fluxes showed a significant temporal pattern with a peak value in late August in both 2010 and 2011. However, no distinct seasonal variation was observed in the CH4 flux in the shrub-mosses-dominated community. Interestingly, in both Eriophorum- and shrub-sphagnum-dominated communities, CH4 fluxes did not show close correlation with air or soil temperature and water table depth, whereas CH4 emissions correlated well to active layer depth and CH4 concentration in soil pore water, especially in the Eriophorum-dominated community. Our results suggest that CH4 released from the thawed CH4-rich permafrost layer may be a key factor controlling CH4 emissions in boreal peatlands, and highlight that CH4 fluxes vary with vegetation type in boreal peatlands. With increasing temperature in future climate patterns, increasing active layer depth and shifting plant functional groups in this region may have a significant effect on CH4 emission.
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影响因子：
1.7
作者：
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通讯作者：
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影响因子：
4
作者：
T. Moore;R. Knowles
通讯作者：
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影响因子：
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作者：
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影响因子：
11.6
作者：
Song, Changchun;Xu, Xiaofeng;Wang, Yiyong
通讯作者：
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影响因子：
8.8
作者：
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