globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13612
论文题名:
A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability
作者: Olefeldt D.; Euskirchen E.S.; Harden J.; Kane E.; McGuire A.D.; Waldrop M.P.; Turetsky M.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:6
起始页码: 2428
结束页码: 2440
语种: 英语
英文关键词: carbon dioxide ; climate change ; ecosystem respiration ; methane ; peatland ; soil temperature ; water table ; wetland
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 (FCH 4), 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 FCH 4, 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 ~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 inter-annual 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, FCH 4 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 FCH 4 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 FCH 4, but droughts caused no inter-annual lag effects on FCH 4. 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. © 2017 John Wiley & Sons Ltd
资助项目: This APEX has been supported by National Science Foundation grants (DEB-0425328, DEB-0724514 and DEB-0830997) to M.R.T, A.D.M, J.H., E.E. and E.S.K., the Bonanza Creek Long-Term Ecological Research program (funded jointly by NSF Grant DEB-0620579, an USDA Forest Service Pacific Northwest Research Grant PNW01-JV11261952-231) and U.S. Geological Survey Climate and Land Use Change Program and Climate Science Center grant funds to J.H., A.D.M., M.W. and E.E. During manuscript compilation and writing, D.O. was supported by a Campus Alberta Innovates Program grant. Any use of trade, firm or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. We thank all collaborators and students who have contributed over the years to the APEX project, namely Bill Cable, Colin Edgar, Michael Waddington, Jamie Hollingsworth, Teresa Hollingsworth, Rebecca Finger, Amy Churchill, Nicole McConnell and Molly Chivers. The authors claim no conflicts of interest.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60938
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Department of Integrative Biology, University of Guelph, Science Complex, Guelph, ON, Canada; Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada; Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States; U.S. Geological Survey, Menlo Park, CA, United States; School of Forest Resources and Environmental Sciences, and USDA Forest Service, Michigan Tech University, Northern Research Station, Houghton, MI, United States; U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, University of Alaska Fairbanks, Fairbanks, AK, United States

Recommended Citation:
Olefeldt D.,Euskirchen E.S.,Harden J.,et al. A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability[J]. Global Change Biology,2017-01-01,23(6)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Olefeldt D.]'s Articles
[Euskirchen E.S.]'s Articles
[Harden J.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Olefeldt D.]'s Articles
[Euskirchen E.S.]'s Articles
[Harden J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Olefeldt D.]‘s Articles
[Euskirchen E.S.]‘s Articles
[Harden J.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.