Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13612 |
A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability | |
Olefeldt, David1,2; Euskirchen, Eugenie S.3; Harden, Jennifer4; Kane, Evan S.5,6; McGuire, A. David7; Waldrop, Mark P.4; Turetsky, Merritt R.1 | |
2017-06-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | Rich fens are common boreal ecosystems with distinct hydrology, biogeochemistry and ecology that influence their carbon (C) balance. We present growing season soil chamber methane emission (F-CH4), ecosystem respiration (ER), net ecosystem exchange (NEE) and gross primary production (GPP) fluxes from a 9-years water table manipulation experiment in an Alaskan rich fen. The study included major flood and drought years, where wetting and drying treatments further modified the severity of droughts. Results support previous findings from peatlands that drought causes reduced magnitude of growing season F-CH4, GPP and NEE, thus reducing or reversing their C sink function. Experimentally exacerbated droughts further reduced the capacity for the fen to act as a C sink by causing shifts in vegetation and thus reducing magnitude of maximum growing season GPP in subsequent flood years by similar to 15% compared to control plots. Conversely, water table position had only a weak influence on ER, but dominant contribution to ER switched from autotrophic respiration in wet years to heterotrophic in dry years. Droughts did not cause interannual lag effects on ER in this rich fen, as has been observed in several nutrient-poor peatlands. While ER was dependent on soil temperatures at 2 cm depth, F-CH4 was linked to soil temperatures at 25 cm. Inter-annual variability of deep soil temperatures was in turn dependent on wetness rather than air temperature, and higher F-CH4 in flooded years was thus equally due to increased methane production at depth and decreased methane oxidation near the surface. Short-term fluctuations in wetness caused significant lag effects on F-CH4, but droughts caused no inter-annual lag effects on F-CH4. Our results show that frequency and severity of droughts and floods can have characteristic effects on the exchange of greenhouse gases, and emphasize the need to project future hydrological regimes in rich fens. |
英文关键词 | carbon dioxide climate change ecosystem respiration methane peatland soil temperature water table wetland |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400445900025 |
WOS关键词 | CARBON-DIOXIDE EXCHANGE ; METHANE EMISSIONS ; CLIMATE-CHANGE ; NORTHERN PEATLAND ; ECOSYSTEM RESPIRATION ; CO2 EXCHANGE ; TEMPERATE ; ACCUMULATION ; SENSITIVITY ; SPHAGNUM |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17459 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Guelph, Dept Integrat Biol, Sci Complex, Guelph, ON N1G 2W1, Canada; 2.Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2H1, Canada; 3.Univ Alaska Fairbanks, Inst Arctic Biol, Fairbanks, AK 99775 USA; 4.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 5.Michigan Tech Univ, Sch Forest Resources & Environm Sci, Northern Res Stn, Houghton, MI 49931 USA; 6.Michigan Tech Univ, USDA, Forest Serv, Northern Res Stn, Houghton, MI 49931 USA; 7.Univ Alaska Fairbanks, Alaska Cooperat Fish & Wildlife Res Unit, US Geol Survey, Fairbanks, AK 99775 USA |
推荐引用方式 GB/T 7714 | Olefeldt, David,Euskirchen, Eugenie S.,Harden, Jennifer,et al. A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability[J]. GLOBAL CHANGE BIOLOGY,2017,23(6). |
APA | Olefeldt, David.,Euskirchen, Eugenie S..,Harden, Jennifer.,Kane, Evan S..,McGuire, A. David.,...&Turetsky, Merritt R..(2017).A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability.GLOBAL CHANGE BIOLOGY,23(6). |
MLA | Olefeldt, David,et al."A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability".GLOBAL CHANGE BIOLOGY 23.6(2017). |
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