globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2015.08.009
Scopus记录号: 2-s2.0-84939780937
论文题名:
Ecosystem development following deglaciation: A new sedimentary record from Devils Lake, Wisconsin, USA
作者: Williams J.J.; McLauchlan K.K.; Mueller J.R.; Mellicant E.M.; Myrbo A.E.; Lascu I.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 125
起始页码: 131
结束页码: 143
语种: 英语
英文关键词: Climate ; Fire ; Holocene ; Mineral magnetism ; Primary succession ; Stable isotopes ; Vegetation
Scopus关键词: Charcoal ; Ecology ; Ecosystems ; Fires ; Geochronology ; Glacial geology ; Isotopes ; Lakes ; Lithology ; Magnetic materials ; Magnetism ; Phosphate minerals ; Productivity ; Sedimentology ; Sediments ; Vegetation ; Agricultural activities ; Anthropogenic influence ; Climate ; Holocenes ; Primary succession ; Stable isotopes ; Terrestrial ecosystems ; Terrestrial vegetation ; Aquatic ecosystems ; climate conditions ; deglaciation ; ecosystem management ; geoaccumulation ; Holocene ; lacustrine deposit ; Last Glacial Maximum ; nitrogen isotope ; nutrient cycling ; organic matter ; Pleistocene ; Postglacial ; reconstruction ; stable isotope ; terrestrial ecosystem ; vegetation structure ; vivianite ; Devils Lake ; Midwest ; North Dakota ; United States ; Ambrosia ; Picea
英文摘要: Processes and rates of ecosystem development can be reconstructed using lacustrine sedimentary sequences, but this approach often requires records that contain the start of primary succession. Most lakes in the upper Midwestern U.S. were formed by glaciers at the end of the last Ice Age approximately 11,700 cal yr BP. Devils Lake, Wisconsin is a rare example of a lake from this region whose sediments extend into the Pleistocene and may include the Last Glacial Maximum. Sediment magnetic, geochemical, pollen, and charcoal records were generated from a 10 m core whose basal sediments may be 28,000 years old. Together with a previously published pollen record, these proxies combine to reveal a history of long-term climatic, vegetative and geologic change during the late Pleistocene to Holocene. We identify six sedimentary units that indicate a series of consecutive events rather than a predictable trajectory of ecosystem development at the site. Productivity in the lake was low during the late Pleistocene and increased during the Holocene, as reflected by the sediment lithology, which shows a sudden shift from glacial vivianite-rich and organic-poor clastic-dominated sediments to Holocene diatomaceous sapropels. Several important processes initiated around 17,000 cal yr BP, including the onset of organic matter accumulation and fire in the terrestrial ecosystem. However, the post-glacial landscape was not devoid of vegetation because pollen assemblages indicate that terrestrial vegetation, likely a spruce tundra, survived near the site. A switch to a hardwood forest period during the Holocene also led to a change in the fire regime, with increased frequency of burning. Aquatic ecosystem productivity lagged terrestrial ecosystem productivity throughout the record. Nutrient cycling (as recorded by sedimentary δ15N) was variable but not directional, and appeared to be correlated with climate conditions early in the record, and terrestrial ecosystem processes later in the record. Throughout the Holocene magnetic mineral concentration decreased as productivity increased, and the source of magnetic material shifted from almost exclusively lithogenic to approximately 50% derived from soil or biogenic sources. Magnetic grain size, Ambrosia pollen percentages, and charcoal concentration increased and δ15N decreased in the most recent part of the record, due to anthropogenic influence in the region including agricultural activities. © 2015 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59829
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geography, Kansas State University, 118 Seaton Hall, Manhattan, KS, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL, United States; LacCore/CSDCO/Limnological Research Center, Department of Earth Sciences, University of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN, United States; Institute for Rock Magnetism, Department of Earth Sciences, University of Minnesota, 100 Union Street SE, Minneapolis, MN, United States; University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom

Recommended Citation:
Williams J.J.,McLauchlan K.K.,Mueller J.R.,et al. Ecosystem development following deglaciation: A new sedimentary record from Devils Lake, Wisconsin, USA[J]. Quaternary Science Reviews,2015-01-01,125
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