Spatiotemporal variability in water sources of urban soils and trees in the semiarid, irrigated Salt Lake Valley
Abstract
Plant transpiration is a critical process in ecohydrology and urban water budgets. Urban forests in the semiarid cities of the western United States are composed largely of non-native species sustained by irrigation. Given that the major end use of water in these cities is usually landscape irrigation, the efficiency of irrigation practices is essential in future water conservation measures. The dependence of urban trees on irrigation is driven not only by the availability of alternative water sources (e.g., precipitation) but also by patterns of infiltration and mobility of soil water. In this study, we used hydrogen and oxygen stable isotopes to identify spatiotemporal dynamics of trees, of varied sizes and species, and shallow soil water apportioning of irrigation versus winter snowmelt in urban parks in the semiarid Salt Lake Valley. We estimate for this ecosystem that, on average, >70% of tree transpiration and soil moisture during the summer originate from irrigation, with lower proportions of snowmelt (<30%) from the preceding winter. This implies that a fraction of summer transpiration is originated from out of phase precipitation inputs. Irrigation fractions are dominant throughout the growing season for soil and stem water, but snowmelt fractions increase in stem water towards the endmore »
- Authors:
-
[1];
[1];
[1];
[2]
- Univ. of Utah, Salt Lake City, UT (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Red Butte Garden
- OSTI Identifier:
- 1632375
- Report Number(s):
- LLNL-JRNL-781389
Journal ID: ISSN 1936-0584; 976192
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ecohydrology
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 8; Journal ID: ISSN 1936-0584
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; irrigation; snowmelt; soil water; stable isotopes; tree water sources; urban ecosystems
Citation Formats
Gómez‐Navarro, Carolina, Pataki, Diane E., Bowen, Gabriel J., and Oerter, Erik J. Spatiotemporal variability in water sources of urban soils and trees in the semiarid, irrigated Salt Lake Valley. United States: N. p., 2019.
Web. doi:10.1002/eco.2154.
Gómez‐Navarro, Carolina, Pataki, Diane E., Bowen, Gabriel J., & Oerter, Erik J. Spatiotemporal variability in water sources of urban soils and trees in the semiarid, irrigated Salt Lake Valley. United States. https://doi.org/10.1002/eco.2154
Gómez‐Navarro, Carolina, Pataki, Diane E., Bowen, Gabriel J., and Oerter, Erik J. Thu .
"Spatiotemporal variability in water sources of urban soils and trees in the semiarid, irrigated Salt Lake Valley". United States. https://doi.org/10.1002/eco.2154. https://www.osti.gov/servlets/purl/1632375.
@article{osti_1632375,
title = {Spatiotemporal variability in water sources of urban soils and trees in the semiarid, irrigated Salt Lake Valley},
author = {Gómez‐Navarro, Carolina and Pataki, Diane E. and Bowen, Gabriel J. and Oerter, Erik J.},
abstractNote = {Plant transpiration is a critical process in ecohydrology and urban water budgets. Urban forests in the semiarid cities of the western United States are composed largely of non-native species sustained by irrigation. Given that the major end use of water in these cities is usually landscape irrigation, the efficiency of irrigation practices is essential in future water conservation measures. The dependence of urban trees on irrigation is driven not only by the availability of alternative water sources (e.g., precipitation) but also by patterns of infiltration and mobility of soil water. In this study, we used hydrogen and oxygen stable isotopes to identify spatiotemporal dynamics of trees, of varied sizes and species, and shallow soil water apportioning of irrigation versus winter snowmelt in urban parks in the semiarid Salt Lake Valley. We estimate for this ecosystem that, on average, >70% of tree transpiration and soil moisture during the summer originate from irrigation, with lower proportions of snowmelt (<30%) from the preceding winter. This implies that a fraction of summer transpiration is originated from out of phase precipitation inputs. Irrigation fractions are dominant throughout the growing season for soil and stem water, but snowmelt fractions increase in stem water towards the end of summer. Tree size, location, and species were not strongly associated with water sources under well-irrigated conditions. These results show that urban tree management practices should consider the impact of both irrigation practices and residual precipitation inputs, highlighting the importance of examining interannual time scales when calculating the local water budget.},
doi = {10.1002/eco.2154},
journal = {Ecohydrology},
number = 8,
volume = 12,
place = {United States},
year = {Thu Oct 10 00:00:00 EDT 2019},
month = {Thu Oct 10 00:00:00 EDT 2019}
}
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Cited by: 15 works
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Figures / Tables:
Table 1: 𝛿2H, 𝛿18O, and LCxs of irrigation water from five locations distributed throughout the SLV for June, July, September (Sept) and December (Dec). Precipitation data from Ehleringer et al. (2016).
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