DOI: 10.1016/j.quascirev.2018.09.014
Scopus记录号: 2-s2.0-85054179185
论文题名: Hydrological study of Lyngmossen bog, Sweden: Isotopic tracers (3H, δ2H and δ18O) imply three waters with different mobilities
作者: Ooki S. ; Akagi T. ; Jinno H. ; Franzén L.G. ; Newton J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 199 起始页码: 97
结束页码: 107
语种: 英语
Scopus关键词: Evaporation
; Isotopes
; Peat
; Plants (botany)
; Wetlands
; Capillary action
; Different pressures
; Isotope fractionation
; Isotopic information
; Isotopic tracer
; Isotopic variations
; Plant utilization
; Stable isotope ratios
; Extraction
; Sphagnum
英文摘要: The 3H concentration and stable isotope ratio of hydrogen and oxygen, δ2H and δ18O, of waters extracted from a Sphagnum-dominant raised bog in Lyngmossen, Sweden, were measured in order to understand where the precipitation is retained and how mobile it is. Three types of waters, which were defined by extractability, were collected from the peat. Two waters were extracted by compressing samples with different pressures (SQW1 and SQW2). The other water was obtained by distilling the compressed samples (DW). 3H was detected in all types of water from depths of 0–50 cm: the concentrations in SQW1, SQW2 and DW ranged 1.17–3.07 Bq/L, 0.98–2.03 Bq/L, and 1.02–1.54 Bq/L, respectively. The maximum 3H concentrations of SQW1, SQW2 and DW were all detected at a depth of around 15 cm, whose 14C age covers the year of the atomic bomb experiments. The 3H results of SQW1/2 indicate that SQW consists of at least two waters of different mobility, water flowing rapidly downward and immobile water. Sphagnum hyaline cells may be responsible for the immobile water. The δ18O and δ2H relationship exhibited independent trends between SQW and DW. The distinct difference observed between the two waters at the surface (0–5 cm) indicates that the two waters may be supplied by precipitation at different times of the year, or alternatively that DW comprises plant water taken in from hyaline cells. The δ18O and δ2H values of both SQW and DW in the shallow layer increased with increasing depth, and in the layer around 30 cm depth, those of SQW showed a distinct decrease with depth. Isotope fractionation caused by evaporation and/or plant utilization of water at the surface layer are considered to be the main causes of such isotopic variation at the surface. Evaporation is likely to take place in much drier conditions for DW than for SQW, probably through stems by capillary action. In SQW freezing may be a possible cause for the decrease of δ18O and δ2H around 30 cm depth. DW is isotopically very well separated from two SQW1/2. Integrating all isotopic information, we conclude the presence of three different waters: least mobile water at shallow depth perhaps in hyaline cells, which can be extracted by squeezing peat with low pressure; most mobile water in a deeper layer than 30 cm, extracted also by squeezing peat; mobile but least extractable water, which is likely water inside plant tissues. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112031
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; Department of Earth Sciences, Göteborg University, Sweden; NERC Life Sciences Mass Spectrometry Facility, Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, G75 0QF, United Kingdom; Chiba Prefectural Environmental Research Center, 1-8-8 Iwasaki-Nishi, Ichihara, Chiba 290-0046, Japan
Recommended Citation:
Ooki S.,Akagi T.,Jinno H.,et al. Hydrological study of Lyngmossen bog, Sweden: Isotopic tracers (3H, δ2H and δ18O) imply three waters with different mobilities[J]. Quaternary Science Reviews,2018-01-01,199