Ecohydrology of urban trees under passive and active irrigation in a semiarid city


Autoři: Anthony M. Luketich aff001;  Shirley A. Papuga aff002;  Michael A. Crimmins aff004
Působiště autorů: Department of Biology, University of New Mexico, Albuquerque, New Mexico, United States of America aff001;  School of Natural Resources and the Environment, University of Arizona, Tucson, Arizona, United States of America aff002;  Department of Geology, Wayne State University, Detroit, Michigan, United States of America aff003;  Department of Environmental Science, University of Arizona, Tucson, Arizona, United States of America aff004
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224804

Souhrn

The infiltration of stormwater runoff for use by urban trees is a major co-benefit of green infrastructure for desert cities with limited water resources. However, the effects of this passive irrigation versus regular, controlled moisture inputs, or active irrigation, is largely unquantified. We monitored the ecohydrology of urban mesquite trees (Prosopis spp.) under these contrasting irrigation regimes in semiarid Tucson, AZ. Measurements included soil moisture, sap velocity, canopy greenness, and leaf-area index. We expected both irrigation types to provide additional deep (>20 cm) soil moisture compared to natural conditions, and that trees would depend on this deep moisture for transpiration and phenological activity. Results show that active irrigation supported higher soil moisture throughout the study than passive irrigation. Passive irrigation only provided additional deep moisture when green infrastructure features received impervious runoff from a city street. Sap velocity and greenness were similar under both irrigation types, outside of isolated periods of time. These differences occurred during the extremely wet summer 2017 when passively irrigated trees exhibited a greenness peak, and the dry conditions of spring when actively irrigated trees had higher sap flow and relative greenness. Finally, it was not determined that deep soil moisture had a stronger relationship with mesquite productivity than shallow moisture, but both relationships were stronger in the spring, before summer rains. This study aims to contribute empirical observations of green infrastructure performance for urban watershed management.

Klíčová slova:

Agricultural irrigation – Deserts – Rain – Seasons – Spring – Summer – Trees – Urban ecology


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Článek vyšel v časopise

PLOS One


2019 Číslo 11