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Drivers of variability in water use of native and non-native urban trees in the greater Los Angeles area

Content Provider	Springer Nature Link
Author	McCarthy, Heather R. Pataki, Diane E.
Copyright Year	2010
Abstract	Trees in urban ecosystems are valued for shade and cooling effects, reduction of CO$_{2}$ emissions and pollution, and aesthetics. However, in arid and semi-arid regions, urban trees must be maintained through supplemental irrigation, in competition with other water needs. Currently, a comprehensive understanding of the factors which influence water use of urban tree species is lacking. In order to study the drivers of whole tree water use of two common species in the Los Angeles Basin urban forest, four sites in Los Angeles and Orange County were instrumented with sap flow and meteorological sensors. These sites allowed comparisons of the water use of a native riparian (Platanus racemosa Nutt.; California sycamore) and non-native (Pinus canariensis C. Sm.; Canary Island pine) Mediterranean species, as well as the spatial variability in water use under different environmental and management conditions. We found higher rates of sapflux (J $_{O}$) in native California sycamore as compared to non-native Canary Island pine. Within each species, we found considerable site-to-site variability in the magnitude and seasonality of J $_{O}$. For Canary Island pine, the majority of inter-site variability derived from differences in water availability: response to vapor pressure deficit was similar during a period without water limitations. In contrast, California sycamore did not appear to experience water limitation at any site; however, there was considerable spatial variability in water use, potentially linked to differences in nutrient availability. Whole tree transpiration (E) was similar for the two species when water was not limiting, but Canary Island pine was able to withstand unirrigated conditions with a very low E. These results add to the currently small pool of data on urban tree water use and ecophysiology, and contribute to establishing a more quantitative understanding of urban tree function.
Starting Page	393
Ending Page	414
Page Count	22
File Format	PDF
ISSN	10838155
Journal	Urban Ecosystems
Volume Number	13
Issue Number	4
e-ISSN	15731642
Language	English
Publisher	Springer US
Publisher Date	2010-04-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Managed landscapes Plant hydraulics Sapflux Urban ecology Water stress Nature Conservation Ecology Environmental Management Urban Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Urban Studies

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