Application of tree-ring isotopic analyses to reconstruct historical water use of riparian trees

Karrin P. Alstad, Stephen C. Hart, Jonathan L. Horton, Thomas E Kolb

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Historical patterns of water source use by trees inferred from long-term records of tree-ring stable isotopic content could assist in evaluating the impact of human alterations to natural stream flow regimes (e.g., water impoundments, stream flow diversions, and groundwater extraction). Our objective was to assess the utility of the hydrogen stable isotopic composition (δD) of tree rings as an index of historical water source use by riparian trees. We investigated the influence of site conditions that varied in climate and hydrology on the relationship between δD of Populus xylem water (δDxyl) and tree-ring cellulose (δDcell). δDxyl and δDcell were strongly correlated across sites (r2 = 0.89). However, the slope of this relationship was less than 1, indicating that factors other than δDxyl influenced δDcell Inverse modeling with an isotopic fractionation model for tree-ring cellulose suggested that the lack of one-to-one correspondence between δDxyl and δD cell was due to the influence of the hydrogen isotopic content of the atmospheric water vapor (δDatm). Empirically measured values of δDcell were typically within the seasonal range of δDcell predicted from the fractionation model. Sensitivity analyses showed that changes in δDxyl generally had a greater influence at high-elevation montane sites, whereas δDxyl and δDatm had about equal influence on δDcell at low-elevation desert sites. The intrasite relationship between δD cell and δDxyl among individual trees was poor, perhaps because of the within-site spatial variation in hydrologic conditions and associated tree physiological responses. Our study suggests that historical variation in δDcell of Populus provides information on historical variation in both time-integrated water source use and atmospheric conditions; and that the influence of atmospheric conditions is not consistent over sites with large differences in temperature and humidity. Reconstruction of xylem water sources of Populus in riparian ecosystems from δD cell will be more direct at higher elevation mountain sites than at low-elevation desert sites.

Original languageEnglish (US)
Pages (from-to)421-437
Number of pages17
JournalEcological Applications
Volume18
Issue number2
DOIs
StatePublished - Mar 2008

Fingerprint

tree ring
water use
xylem
water
streamflow
cellulose
desert
hydrogen
isotopic fractionation
physiological response
impoundment
water vapor
humidity
hydrology
isotopic composition
spatial variation
fractionation
mountain
ecosystem
climate

Keywords

  • Cellulose
  • Riparian trees
  • Stable isotopes
  • Tree rings
  • Water use

ASJC Scopus subject areas

  • Ecology

Cite this

Application of tree-ring isotopic analyses to reconstruct historical water use of riparian trees. / Alstad, Karrin P.; Hart, Stephen C.; Horton, Jonathan L.; Kolb, Thomas E.

In: Ecological Applications, Vol. 18, No. 2, 03.2008, p. 421-437.

Research output: Contribution to journalArticle

Alstad, Karrin P. ; Hart, Stephen C. ; Horton, Jonathan L. ; Kolb, Thomas E. / Application of tree-ring isotopic analyses to reconstruct historical water use of riparian trees. In: Ecological Applications. 2008 ; Vol. 18, No. 2. pp. 421-437.
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