DOI: 10.1007/s10533-013-9938-x
Scopus记录号: 2-s2.0-84896390684
论文题名: Calcium, strontium and barium biogeochemistry in a forested catchment and insight into elemental discrimination
作者: Watmough S.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 357
结束页码: 369
语种: 英语
英文关键词: Barium
; Calcium
; Discrimination
; Strontium
; Trees
Scopus关键词: alkaline earth metal
; biogeochemistry
; biological uptake
; biomass
; catchment
; concentration (composition)
; developmental biology
; discriminant analysis
; forest ecosystem
; forest floor
; plant
; soil horizon
; soil water
; throughfall
; Canada
; Ontario [Canada]
英文摘要: Elemental ratios of calcium (Ca), strontium (Sr) and barium (Ba) in plant tissue have been used to help identify sources of Ca in trees. However, recent work has clearly shown that ratios of Ca:Sr or Ca:Ba in plant tissues differ from soil values and discrimination factors (alteration of elemental ratios of Ca, Sr and Ba) have been established to account for differences between soil and foliar values. In this study, concentrations of Ca, Sr and Ba (and molar ratios) in bulk deposition, throughfall, soil water and stream water were measured along with tree chemistry and biomass (foliage, branches, bark, wood, roots and litter) at a forested catchment in central Ontario, Canada. Concentrations of Ca, Sr and Ba vary greatly among the eight dominant tree species and plant tissue and molar ratios of Ca:Sr or Ca:Ba vary more than tenfold. In general Ca:Sr ratios were highest in foliage (up to 3,175) and lowest in wood (low as 91) and the mass-weighted Ca:Sr ratio of the total tree biomass was approximately 340. The molar ratio of Ca:Sr in bulk precipitation was ~820, increased to over 1,000 in throughfall and then decreased steadily through the various soil horizons, falling to 320 in the B horizon. Conservative mass balances for the forest floor for Ca, Sr and Ba suggest that more than half the Ca, Sr and Ba annual uptake by trees is obtained from mineral soil, which is consistent with the observation that the weighted-average ratios of Ca:Sr, Ca:Ba or Ba:Sr in the forest biomass fall between values in water draining the forest floor and water draining the rooting zone (B horizon). This work shows that discrimination between Ca, Sr and Ba is primarily internal to trees and discrimination factors between soil and foliage should be interpreted with caution. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83682
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: Environmental and Resource Studies, Trent University, Peterborough, ON, K9J 7B8, Canada
Recommended Citation:
Watmough S.A.. Calcium, strontium and barium biogeochemistry in a forested catchment and insight into elemental discrimination[J]. Biogeochemistry,2014-01-01,118(2018-01-03)