Oecologia

, Volume 177, Issue 2, pp 345–355 | Cite as

Seasonal stomatal behavior of a common desert shrub and the influence of plant neighbors

Physiological ecology - Original research

Abstract

Stomata simultaneously regulate plant carbon gain and water loss, and patterns of stomatal conductance (gs) provide insight into water use strategies. In arid systems, gs varies seasonally based on factors such as water availability and temperature. Moreover, the presence and species identity of neighboring plants likely affects gs of the focal plant by altering available soil water and microclimate conditions. We investigated stomatal behavior in Larrea tridentata, a drought-tolerant, evergreen shrub occurring throughout the arid southwestern United States. We measured gs in Larrea over multiple seasons in the presence of neighbors representing different woody species. The data were analyzed in the context of a commonly used phenomenological model that relates gs to vapor pressure deficit (D) to understand spatial and temporal differences in stomatal behavior. We found that gs in Larrea was affected by neighborhood association, and these effects varied seasonally. The greatest effect of neighborhood association on gs occurred during the winter period, where Larrea growing alone (without neighbors) had higher gs compared to Larrea growing with neighbors. Larrea’s stomatal sensitivity to D and reference conductance (i.e., gs at D = 1 kPa) also differed significantly among different neighbor associations. Random effects indicated reference gs varied over short time scales (daily), while stomatal sensitivity showed little daily or seasonal variation, but was notably affected by neighbor associations such that neighboring species, especially trees, reduced Larrea’s sensitivity to D. Overall, seasonal dynamics and neighborhood conditions appear critical to understanding temporal and spatial variation in Larrea’s physiological behavior.

Keywords

Bayesian modeling Deserts Larrea tridentata Plant water use Neighborhood interactions 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.School of Life SciencesArizona State UniversityTempeUSA

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