Isotopic fractionation induced by a surface effect influences the estimation of the hydrological process of topsoil

Guo Chen; Xiaozhen Li; Wenyi Qin; Ningfei Lei; Luan Zi Sun; Longxi Cao; Xiaolu Tang

doi:10.1002/hyp.14019

journal article Jan 01, 2021

Isotopic fractionation induced by a surface effect influences the estimation of the hydrological process of topsoil

Guo Chen

Xiaozhen Li

Wenyi Qin Ningfei Lei Luan Zi Sun Longxi Cao Xiaolu Tang

Hydrological Processes Vol. 35 No. 1 · Wiley

View at Publisher Save 10.1002/hyp.14019

Abstract

AbstractIsotopic heterogeneity in soil water has hindered the application of isotope compositions (δ18O and δ2H) in soil water dynamics. This heterogeneity has been suggested to be caused by soil properties such as organic matter (OM) and clay content. However, this is yet to be verified in field soil. We sampled the organic layer (O‐horizon soil) with highly decomposed organic material and the A‐horizon soil in western Sichuan, China, and equilibrated these samples with vapour created by unconfined labelling water. The relationship between soil properties and isotopic fractionation (εT/U) between unconfined water and the total soil water was used to determine the line‐conditioned excess (lc‐excess) and source rain of A‐horizon field soil by removing the influence of confined water. Equilibration experiments demonstrated a significant isotopic difference between the εT/U levels in the A‐horizon and O‐horizon soils, indicating that OM plays an important role in isotopic fractionation. In field samples, the lc‐excess of the unconfined A‐horizon water was, on an average, 2.5‰ higher than that of bulk soil water. The average offsets between the annual rain and the estimated source rain of soil water decreased by 5.0 and 0.5‰ for hydrogen and oxygen after removing the influence of confined water. Isotopic heterogeneity should not be ignored while examining the evaporation of soil water, soil source rain, and hence the recent ‘two water worlds’ hypothesis, which is especially true for cases in which the soils contain high levels of OM.

Topics

No keywords indexed for this article. Browse by subject →

References

50

[1]

10.1002/hyp.13633

[2]

10.1016/0022-1694(94)02636-p

[3]

10.1016/s0167-1987(99)00107-5

[4]

10.5194/hess-23-2129-2019

[5]

10.5194/bg-13-3175-2016

[6]

10.1021/acs.jafc.9b02978

[7]

10.3390/f10121069

[8]

10.1111/nph.15670

[9]

10.2136/vzj2016.04.0036

[10]

Global separation of plant transpiration from groundwater and streamflow

Jaivime Evaristo, Scott Jasechko, Jeffrey J. McDonnell

Nature 10.1038/nature14983

[11]

10.1016/j.scitotenv.2014.06.010

[12]

10.1111/j.1365-2028.2006.00682.x

[13]

10.1029/2007gb002997

[14]

10.1039/c6nr09931a

[15]

10.5194/hess-21-6363-2017

[16]

Kakiuchi M. "Hydrogen isotope fractionation in aqueous alkaline earth chloride solutions" Journal of Physical Sciences (2007)

[17]

10.1016/j.jhydrol.2019.124442

[18]

10.1016/j.phytochem.2020.112389

[19]

10.1016/j.catena.2020.104514

[20]

10.1016/j.scitotenv.2017.02.061

[21]

10.1002/hyp.13765

[22]

10.1016/j.gca.2016.04.029

[23]

10.1016/j.gca.2017.12.021

[24]

10.1016/j.catena.2020.104526

[25]

10.1007/s10040-007-0260-3

[26]

10.1016/j.agwat.2019.105933

[27]

10.1111/nph.13376

[28]

10.1007/s12039-008-0009-0

[29]

10.1080/10256016.2017.1302446

[30]

10.1016/j.jhydrol.2014.04.029

[31]

10.1002/eco.1841

[32]

10.1029/2019jg005418

[33]

10.1016/j.agee.2019.106790

[34]

10.1016/0016-7037(87)90079-2

[35]

10.1029/2010jd015242

[36]

10.1515/johh-2017-0055

[37]

10.1002/2015rg000515

[38]

10.1029/jc080i027p03812

[39]

10.5194/hess-16-2605-2012

[40]

10.1002/rcm.8348

[41]

10.2136/vzj2013.01.0029

[42]

10.1016/j.actatropica.2019.105132

[43]

10.1016/j.molliq.2010.04.005

[44]

10.1111/nph.14616

[45]

10.1002/hyp.13606

[46]

10.1002/hyp.13541

[47]

Xu Q. "Study on hydrogen and oxygen stable isotopes in precipitation in Wolong Nature Reserve,Sichuan Province" Forest Research (2006)

[48]

10.1016/j.geoderma.2015.10.003

[49]

10.1007/s40333-013-0140-8

[50]

10.1016/j.coal.2014.08.009

Metrics

11

Citations

50

References

Details

Published: Jan 01, 2021
Vol/Issue: 35(1)
License: View

Authors

G

Guo Chen

College of Ecology and Environment, Chengdu University of Technology Chengdu Sichuan China; College of Earth Science, Chengdu University of Technology Chengdu Sichuan China

X

Xiaozhen Li

College of Earth Science, Chengdu University of Technology Chengdu Sichuan China

W

Wenyi Qin

College of Earth Science, Chengdu University of Technology Chengdu Sichuan China

N

Ningfei Lei

College of Ecology and Environment, Chengdu University of Technology Chengdu Sichuan China

L

Luan Zi Sun

Faculty of Grassland Science College of Grassland Agriculture, Northwest A&F University Yangling Shaanxi China

L

Longxi Cao

College of Ecology and Environment, Chengdu University of Technology Chengdu Sichuan China

X

Xiaolu Tang

College of Ecology and Environment, Chengdu University of Technology Chengdu Sichuan China

Funding

National Natural Science Foundation of China Award: 41803008

Cite This Article

Guo Chen, Xiaozhen Li, Wenyi Qin, et al. (2021). Isotopic fractionation induced by a surface effect influences the estimation of the hydrological process of topsoil. Hydrological Processes, 35(1). https://doi.org/10.1002/hyp.14019

Isotopic fractionation induced by a surface effect influences the estimation of the hydrological process of topsoil

You May Also Like