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

Authors:	Erik Oerter
Owners:	iUTAH Data Manager · Erik Oerter
Resource type:	Generic
Created:	Aug. 26, 2017, 10:32 p.m.
Last updated:	Aug. 27, 2017, 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

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, http://dx.doi.org/10.4211/hs.5e81d3071b1745a297542844859c1318

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

http://creativecommons.org/licenses/by/4.0/

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:

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