DOI: 10.1007/s10533-014-9969-y
Scopus记录号: 2-s2.0-84900794731
论文题名: Beryllium-7 as a natural tracer for short-term downwash in peat
作者: Hansson S.V. ; Kaste J.M. ; Chen K. ; Bindler R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 329
结束页码: 339
语种: 英语
英文关键词: Beryllium
; Downwash
; Geochemistry
; Peat
Scopus关键词: atmospheric pollution
; beryllium isotope
; decomposition
; mire
; nutrient cycling
; peatland
; tracer
; Sweden
; Sphagnum
英文摘要: Several factors can affect the integrity of natural archives such as peat records, e.g., decomposition and nutrient cycling, and it has also been hypothesized that some rapid downward transport of atmospherically derived elements may occur. We test this hypothesis by analyzing the short-lived, natural tracer beryllium-7 (t1/2 = 53.4 days) in five cores from two peatlands. In triplicate hummock cores from a raised bog in southern Sweden, 7Be could be measured to 20, 18 and 8 cm depth, and in a nutrient-poor mire in northern Sweden to a depth of 16 cm in a Sphagnum lawn core, but only 4 cm in the dominant, more-decomposed fen peat, indicating some spatial variability both within and between sites. Total 7Be inventories were 320-450 Bq m-2 in the bog, and 150 Bq m-2 (lawn) and 240 Bq m-2 (fen peat) in the mire. 25-79 % of the total inventory of 7Be was located in the upper 2-cm layer. To further test downwashing, in the laboratory we applied a CuBr-solution to two cores and a Cu-solution to one core taken from the mire Sphagnum lawn, all with low water table conditions. About 50 % of the added Cu and ~35 % of the added Br were retained in the surface (2 cm) layer; 1-3 % of the Cu was found at 8-12 cm depth and ~1 % of the Br was measured in the lowest level (20-22 cm). Based on our novel approach using 7Be and experimental work we show that short-term downwashing can occur in peatlands and we suggest the depth of this will depend on the properties of the peat, e.g., bulk density and decomposition, as well as hydrology. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83656
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 Ecology and Environmental Science, Umeå University, 901 87 Umeå, Sweden; Geology Department, The College of William and Mary, Williamsburg, VA, 23187, United States
Recommended Citation:
Hansson S.V.,Kaste J.M.,Chen K.,et al. Beryllium-7 as a natural tracer for short-term downwash in peat[J]. Biogeochemistry,2014-01-01,119(2018-01-03)