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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
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Resource type: Generic
Storage: The size of this resource is 178.7 KB
Created: Nov 04, 2017 at 4:05 p.m.
Last updated: Nov 04, 2017 at 4:49 p.m.
DOI: 10.4211/hs.0a2ec1696e2842548c9a8103edc55c9b
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Sharing Status: Published
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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.

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Resource Level 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

Start Date:
End Date:

Content

References

Related Resources

This resource updates and replaces previous version: http://www.hydroshare.org/resource/5e81d3071b1745a297542844859c1318

Credits

Funding Agencies

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

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

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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