气候变化领域集成服务门户(CCPortal): The biogeochemical consequences of late Holocene wildfires in three subalpine lakes from northern Colorado

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DOI	10.1016/j.quascirev.2020.106293
	The biogeochemical consequences of late Holocene wildfires in three subalpine lakes from northern Colorado
	Pompeani D.P.; McLauchlan K.K.; Chileen B.V.; Calder W.J.; Shuman B.N.; Higuera P.E.
发表日期	2020
ISSN	0277-3791
卷号	236
英文摘要	Wildfire activity has been increasing in forests of western North America over the past several decades. However, the biogeochemical effects of changing fire regimes are poorly understood. Here, we utilize sediment records from three subalpine lakes in northern Colorado (Hinman, Gold Creek, and Summit) to investigate the biogeochemical consequences of charcoal-inferred fire events over the past ∼2500 years. We measured element concentrations and stable isotope ratios (δ13C, δ15N) in lake sediments to track past biogeochemical processes. On average, fires were followed by increases in carbon (C), nitrogen (N), and sulfur concentrations in lake sediments, which lasted ∼20 years, while titanium and other metals found in terrestrial mineral material decreased. These changes were only statistically significant (p < 0.10) for nitrogen, titanium, and δ13C at Gold Creek Lake, and for sulfur and δ15N at Hinman Lake, suggesting either that the biogeochemical response to fire is variable through time or that the low temporal resolution of the proxy records (i.e., ∼19.2 years/sample) limited the ability to detect short-term impacts. Measurements of C/N, δ13C, and δ15N suggest that the sources of post-fire C and N differed among the study lakes. Sources of sedimentary organic matter include both erosion of soil organic matter and increased in-lake primary productivity, depending on site-specific watershed characteristics (e.g., vegetation, hydrology, elevation). These results suggest that if fire frequencies increase in the future, soil C and N stocks may not have adequate time to recover after fires, potentially jeopardizing the long-term biogeochemical resilience of these ecosystems. © 2020 Elsevier Ltd
英文关键词	Carbon; Fire; Isotopes; Nitrogen; Rocky mountains; Soil
语种	英语
scopus关键词	Biogeochemistry; Charcoal; Gold; Lakes; Nitrogen; Organic compounds; Sediments; Sulfur; Biogeochemical effects; Biogeochemical process; Biogeochemical response; Element concentrations; Sedimentary organic matter; Stable isotope ratios; Sulfur concentrations; Watershed characteristics; Fires; biogeochemical cycle; forest ecosystem; forest edge; Holocene; lacustrine deposit; sediment chemistry; soil organic matter; stable isotope; subalpine environment; watershed; wildfire; Colorado; North America; United States
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151496
作者单位	Department of Geography and Geospatial Sciences, Kansas State University, Manhattan, KS 66506, United States; Department of Geology, Kansas State University, Manhattan, KS 66506, United States; Department of Botany, University of Wyoming, Laramie, WY 82071, United States; Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071, United States; Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, MT 59812, United States
推荐引用方式 GB/T 7714	Pompeani D.P.,McLauchlan K.K.,Chileen B.V.,et al. The biogeochemical consequences of late Holocene wildfires in three subalpine lakes from northern Colorado[J],2020,236.
APA	Pompeani D.P.,McLauchlan K.K.,Chileen B.V.,Calder W.J.,Shuman B.N.,&Higuera P.E..(2020).The biogeochemical consequences of late Holocene wildfires in three subalpine lakes from northern Colorado.Quaternary Science Reviews,236.
MLA	Pompeani D.P.,et al."The biogeochemical consequences of late Holocene wildfires in three subalpine lakes from northern Colorado".Quaternary Science Reviews 236(2020).