气候变化领域集成服务门户(CCPortal): Persistent net release of carbon dioxide and methane from an Alaskan lowland boreal peatland complex

CCPortal

DOI	10.1111/gcb.17139
	Persistent net release of carbon dioxide and methane from an Alaskan lowland boreal peatland complex
	Euskirchen, Eugenie S.; Edgar, Colin W.; Kane, Evan S.; Waldrop, Mark P.; Neumann, Rebecca B.; Manies, Kristen L.; Douglas, Thomas A.; Dieleman, Catherine; Jones, Miriam C.; Turetsky, Merritt R.
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	1
卷号	30 期号:1
英文摘要	Permafrost degradation in peatlands is altering vegetation and soil properties and impacting net carbon storage. We studied four adjacent sites in Alaska with varied permafrost regimes, including a black spruce forest on a peat plateau with permafrost, two collapse scar bogs of different ages formed following thermokarst, and a rich fen without permafrost. Measurements included year-round eddy covariance estimates of net carbon dioxide (CO2), mid-April to October methane (CH4) emissions, and environmental variables. From 2011 to 2022, annual rainfall was above the historical average, snow water equivalent increased, and snow-season duration shortened due to later snow return. Seasonally thawed active layer depths also increased. During this period, all ecosystems acted as slight annual sources of CO2 (13-59 g C m(-2) year(-1)) and stronger sources of CH4 (11-14 g CH4 m(-2) from similar to April to October). The interannual variability of net ecosystem exchange was high, approximately +/- 100 g C m(-2) year(-1), or twice what has been previously reported across other boreal sites. Net CO2 release was positively related to increased summer rainfall and winter snow water equivalent and later snow return. Controls over CH4 emissions were related to increased soil moisture and inundation status. The dominant emitter of carbon was the rich fen, which, in addition to being a source of CO2, was also the largest CH4 emitter. These results suggest that the future carbon-source strength of boreal lowlands in Interior Alaska may be determined by the area occupied by minerotrophic fens, which are expected to become more abundant as permafrost thaw increases hydrologic connectivity. Since our measurements occur within close proximity of each other (<= 1 km(2)), this study also has implications for the spatial scale and data used in benchmarking carbon cycle models and emphasizes the necessity of long-term measurements to identify carbon cycle process changes in a warming climate.
英文关键词	boreal lowland ecosystems; carbon cycling; Interior Alaska; methane emissions; net ecosystem exchange; precipitation; thawing permafrost
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001143501000001
来源期刊	GLOBAL CHANGE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304448
作者单位	University of Alaska System; University of Alaska Fairbanks; University of Alaska System; University of Alaska Fairbanks; Michigan Technological University; United States Department of Agriculture (USDA); United States Forest Service; United States Department of the Interior; United States Geological Survey; University of Washington; University of Washington Seattle; United States Department of Defense; United States Army; U.S. Army Corps of Engineers; U.S. Army Engineer Research & Development Center (ERDC); Cold Regions Research & Engineering Laboratory (CRREL); University of Guelph; United States Department of the Interior; United States Geological Survey; University of Colorado System; University of Colorado Boulder
推荐引用方式 GB/T 7714	Euskirchen, Eugenie S.,Edgar, Colin W.,Kane, Evan S.,et al. Persistent net release of carbon dioxide and methane from an Alaskan lowland boreal peatland complex[J],2024,30(1).
APA	Euskirchen, Eugenie S..,Edgar, Colin W..,Kane, Evan S..,Waldrop, Mark P..,Neumann, Rebecca B..,...&Turetsky, Merritt R..(2024).Persistent net release of carbon dioxide and methane from an Alaskan lowland boreal peatland complex.GLOBAL CHANGE BIOLOGY,30(1).
MLA	Euskirchen, Eugenie S.,et al."Persistent net release of carbon dioxide and methane from an Alaskan lowland boreal peatland complex".GLOBAL CHANGE BIOLOGY 30.1(2024).