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In situ measurements of soil and vadose zone water isotopes reveal water storage and fluxes in semi-aird ecosystems


An older version of this resource http://www.hydroshare.org/resource/5e81d3071b1745a297542844859c1318 is available.
Authors: Erik Oerter
Owners: Erik Oerter
DOI:10.4211/hs.0a2ec1696e2842548c9a8103edc55c9b How to Cite
Resource type:Generic
Created:Nov 04, 2017 at 4:05 p.m.
Last updated: Nov 05, 2017 at midnight by Erik Oerter

Abstract

These data are from the following publication:
Oerter, E. J., & Bowen, G. (2017). In situ monitoring of H and O stable isotopes in soil water reveals ecohydrologic dynamics in managed soil systems. Ecohydrology, 10(4).

Abstract:

The water cycle in urban and hydrologically-managed settings is subject to perturbations that are dynamic on small spatial and temporal scales, the effects of which may be especially profound in soils. We deploy a membrane inlet-based laser spectroscopy system in conjunction with soil moisture sensors to monitor soil water dynamics and H and O stable isotope ratios (δ H and δ18O values) in a seasonally irrigated urban landscaped garden soil over the course of 9 months between the cessation of irrigation in the autumn and the onset of irrigation through the summer. We find that soil water δ2H and δ18O values predominately reflect seasonal precipitation and irrigation inputs. A comparison of total soil water by cryogenic extraction and mobile soil water measured by in situ water vapor probes, reveals that initial infiltration events after long periods of soil drying (the autumn season in this case) emplace water into the soil matrix that is not easily replaced by, or mixed with, successive pulses of infiltrating soil water. Tree stem xylem water H and O stable isotope composition did not match that of available water sources. These findings suggest that partitioning of soil water into mobile and immobile “pools” and resulting ecohydrologic separation may occur in engineered and hydrologically-managed soils and not be limited to natural settings. The laser spectroscopy method detailed here has potential to yield insights in a variety of Critical Zone and vadose zone studies, potential that is heightened by the simplicity and portability of the system.

Subject Keywords

Soil water,isotope hydrology

How to cite

Oerter, E. (2017). In situ measurements of soil and vadose zone water isotopes reveal water storage and fluxes in semi-aird ecosystems, HydroShare, https://doi.org/10.4211/hs.0a2ec1696e2842548c9a8103edc55c9b

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    Coverage

    Spatial:

     Coordinate System/Geographic Projection:  WGS 84 EPSG:4326
     Coordinate Units:  Decimal degrees
    Place/Area Name: Near FASB building on UU campus

    Longitude
    -111.8483°
    Latitude
    40.7667°

    Temporal:

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     End Date:

    Content

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    Credits

    This resource was created using funding from the following sources:
    Agency Name Award Title Award Number
    United States National Science Foundation iUTAH-innovative Urban Transitions and Arid region Hydro-sustainability NSF Award Number 1208732

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