DOI: 10.1016/j.quascirev.2014.02.014
Scopus记录号: 2-s2.0-84896117594
论文题名: Biological nitrate utilization in south Siberian lakes (Baikal and Hovsgol) during the Last Glacial period: The influence of climate change on primary productivity
作者: Nara F.W. ; Watanabe T. ; Kakegawa T. ; Minoura K. ; Imai A. ; Fagel N. ; Horiuchi K. ; Nakamura T. ; Kawai T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 90 起始页码: 69
结束页码: 79
语种: 英语
英文关键词: Last Glacial period
; Nitrate utilization
; Nitrogen stable isotope
; Siberian lakes
Scopus关键词: Climate change
; Isotopes
; Nitrates
; Nitrogen
; Phytoplankton
; Salinity measurement
; Sediments
; Vegetation
; Global climate changes
; Hydrological changes
; Last Glacial Maximum
; Last glacial period
; Nitrogen stable isotope
; Phytoplankton activity
; Primary productivity
; Stable nitrogen isotope
; Lakes
; climate
; climate change
; Last Glacial
; nitrate
; nitrogen cycle
; nitrogen isotope
; photic zone
; phytoplankton
; Postglacial
; primary production
; sediment core
; stable isotope
; vertical mixing
; water column
; Hovsgol
; Lake Baikal
; Lake Hovsgol
; Mongolia
; Russian Federation
英文摘要: Stable nitrogen isotope ratios (δ15N) in sediment cores recovered from two Siberian lakes (Baikal and Hovsgol) are determined in order to evaluate the biologically mediated nitrogen cycle from the Last Glacial period to the postglacial period. The ranges of δ15N values from the two lakes are similar, varying from+2.8‰ to+6.7‰. The high values of δ15N (around+6‰) during the Last Glacial Maximum (LGM, 26.5-19calkaBP) indicate that a larger fraction of the available nitrate in both lakes was utilised by phytoplankton. A cool and dry climate during the LGM may have limited the input of terrestrial nitrate, resulting in the use of a large fraction of the nitrate, and low productivity, in both lakes. The use of a smaller fraction of the nitrate by phytoplankton in both lakes after the LGM (19-12calkaBP) is reflected in the lower δ15N values (down to+3.0‰). The increase in summer insolation after the LGM caused increased vertical mixing of the lake water column, which transported nitrate upwards from the deeper waters and into the photic zone. The reduced rate of nitrogen consumption after the LGM indicates that nitrate was more readily available to phytoplankton at this time and did not limit their activities. This change suggests that other factors limited phytoplankton activity during this period. At the climatic transition between Oxygen Isotope Stages 2 and 1 (around 11.5calkaBP), the rapid increase in δ15N (from+3.0‰ to+6.0‰) reflected a rapid increase in nitrate utilization. At this transition, increases in precipitation and lake levels, which were associated with the increased intensity of the East Asian Monsoon, may have brought a large influx of nutrients required by the phytoplankton into the lakes from the watershed. This hydrological change led to increased phytoplankton activity in both lakes, resulting in increased nitrate consumption. The δ15N data obtained here from the sediments of lakes Baikal and Hovsgol suggest that the nitrogen cycle in the Siberian region is strongly linked to hydrological changes across the Asian continent, which are related to global climate change. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60329
Appears in Collections: 过去全球变化的重建
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作者单位: Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan; AGEs, Department of Geology, University of Liège, B-18, Allée du 6 AoÛt, B-4000 Liège, Belgium; National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba 305-850, Japan; Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan; Center for Chronological Research, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan; Association of International Research Initiatives for Environmental Studies, 1-4-4 Ueno, Taitou-ku, Tokyo 110-0005, Japan
Recommended Citation:
Nara F.W.,Watanabe T.,Kakegawa T.,et al. Biological nitrate utilization in south Siberian lakes (Baikal and Hovsgol) during the Last Glacial period: The influence of climate change on primary productivity[J]. Quaternary Science Reviews,2014-01-01,90