Revisiting streamside trees that do not use stream water: can the two water worlds hypothesis and snowpack isotopic effects explain a missing water source?

dc.contributor.author Bowling, David
dc.contributor.author Schulze, Emily
dc.contributor.author Hall, Steven
dc.contributor.author Hall, Steven
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.date 2019-02-20T07:57:24.000
dc.date.accessioned 2020-06-30T02:18:10Z
dc.date.available 2020-06-30T02:18:10Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2016
dc.date.issued 2017-01-01
dc.description.abstract <p>We revisit a classic ecohydrological study that showed streamside riparian trees in a semiarid mountain catchment did not use perennial stream water. The original study suggested that mature individuals of <em>Acer negundo</em>, <em>Acer grandidentatum</em>, and other species were dependent on water from “deeper strata,” possibly groundwater. We used a dual stable isotope approach (δ18O and δ2H) to further examine the water sources of these trees. We tested the hypothesis that groundwater was the main tree water source, but found that neither groundwater nor stream water matched the isotope composition of xylem water during two growing seasons. Soil water (0–1 m depth) was closest to and periodically overlapped with xylem water isotope composition, but overall, xylem water was isotopically enriched compared to all measured water sources. The “two water worlds” hypothesis postulates that soil water comprises isotopically distinct mobile and less mobile pools that do not mix, potentially explaining this disparity. We further hypothesized that isotopic effects during snowpack metamorphosis impart a distinct isotope signature to the less mobile soil water that supplies summer transpiration. Depth trends in water isotopes following snowmelt were consistent with the two water worlds hypothesis, but snow metamorphic isotope effects could not explain the highly enriched xylem water. Thus, the dual isotope approach did not unambiguously determine the water source(s) of these riparian trees. Further exploration of physical, geochemical, and biological mechanisms of water isotope fractionation and partitioning is necessary to resolve these data, highlighting critical challenges in the isotopic determination of plant water sources.</p>
dc.description.comments <p>This is the peer reviewed version of the following article: Bowling, David R., Emily S. Schulze, and Steven J. Hall. "Revisiting streamside trees that do not use stream water: can the two water worlds hypothesis and snowpack isotopic effects explain a missing water source?." Ecohydrology 10, no. 1 (2017): e1771, which has been published in final form at doi: <a href="https://doi.org/10.1002/eco.1771">10.1002/eco.1771</a> . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/eeob_ag_pubs/330/
dc.identifier.articleid 1335
dc.identifier.contextkey 13759253
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath eeob_ag_pubs/330
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23213
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_ag_pubs/330/2017_Hall_RevisitingStreamsideManuscript.pdf|||Fri Jan 14 23:38:36 UTC 2022
dc.source.uri 10.1002/eco.1771
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Geochemistry
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.subject.keywords Acer negundo
dc.subject.keywords Acer grandidentatum
dc.subject.keywords riparian
dc.subject.keywords water
dc.subject.keywords snow
dc.subject.keywords groundwater
dc.title Revisiting streamside trees that do not use stream water: can the two water worlds hypothesis and snowpack isotopic effects explain a missing water source?
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 3f4318fa-b172-4017-b69d-49d5e3607c4f
relation.isOrgUnitOfPublication 6fa4d3a0-d4c9-4940-945f-9e5923aed691
File
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
2017_Hall_RevisitingStreamsideManuscript.pdf
Size:
1.43 MB
Format:
Adobe Portable Document Format
Description:
Collections