globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-9994-x
Scopus记录号: 2-s2.0-84904820151
论文题名:
Dust mediated transfer of phosphorus to alpine lake ecosystems of the Wind River Range, Wyoming, USA
作者: Brahney J.; Ballantyne A.P.; Kociolek P.; Spaulding S.; Otu M.; Porwoll T.; Neff J.C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 120, 期:2018-01-03
起始页码: 259
结束页码: 278
语种: 英语
英文关键词: Alpine lakes ; Atmospheric deposition ; Dust ; Phosphorus ; Wyoming
Scopus关键词: Asterionella formosa ; Bacillariophyta ; Pseudostaurosira ; Pseudostaurosira brevistriata
英文摘要: Alpine lakes receive a large fraction of their nutrients from atmospheric sources and are consequently sensitive to variations in both the amount and chemistry of atmospheric deposition. In this study we explored the spatial changes in lake water chemistry and biology along a gradient of dust deposition in the Wind River Range, Wyoming. Regional differences were explored using the variation in bulk deposition, lake water, sediment, and bedrock geochemistry and catchment characteristics. Dust deposition rates in the Southwestern region averaged 3.34 g m-2 year-1, approximately three times higher than deposition rates in the Northwestern region (average 1.06 g m-2 year-1). Dust-P deposition rates ranged from 87 μg P m2 day-1 in the Northwestern region to 276 μg P m2 day-1 in the Southwestern region. Subalpine and alpine lakes in the Southwestern region had greater total phosphorus (TP) concentrations (5-13 μg L-1) and greater sediment phosphorus (SP) concentrations (2-5 mg g-1) than similar lakes elsewhere in the region (1-8 μg L-1 TP, 0.5-2 mg g-1 SP). Lake phosphorus concentrations were related to dissolved organic carbon (DOC) across vegetation gradients, but related to the percent of bare rock, catchment area to lake area, and catchment steepness across dust deposition gradients. Modern phytoplankton and zooplankton biomasses were two orders of magnitude greater in the Southwest than in the Northwest, and alpine lakes in the Southwest had a unique diatom species assemblage with relatively higher concentrations of Asterionella formosa, Pseudostaurosira pseudoconstruens, and Pseudostaurosira brevistriata. These results suggests that catchment controls on P export to lakes (i.e. DOC) are overridden in dominantly bare rock basins where poor soils cannot effectively retain dust deposited P. © 2014 Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83611
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Geological Sciences, University of Colorado, 2200 Colorado Ave, Boulder, CO, 80309-399, United States; Department of Ecosystem and Conservation Science, University of Montana, 32 Campus Drive, Missoula, MT, 59812, United States; Department of Ecology and Evolutionary Biology, University of Colorado, Ramaley N122, Boulder, CO, 80309-0334, United States; Institute of Arctic and Alpine Research, University of Colorado, 1560 30th Street, Boulder, CO, 80309-0450, United States; United States Forest Service, Bridger-Teton National Forest, Pinedale, WY, United States; Department of Earth and Environmental Sciences, University of British Columbia, Okanagan, 3333 University Way, Kelowna, BC, V1V 1V7, Canada

Recommended Citation:
Brahney J.,Ballantyne A.P.,Kociolek P.,et al. Dust mediated transfer of phosphorus to alpine lake ecosystems of the Wind River Range, Wyoming, USA[J]. Biogeochemistry,2014-01-01,120(2018-01-03)
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