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Water conservation in Artemisia tridentata through redistribution of precipitation

  • Pulse Events and Arid Ecosystems
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Abstract

Water conservation is important for plants that maintain physiologically active foliage during prolonged periods of drought. A variety of mechanisms for water conservation exist including stomatal regulation, foliage loss, above- and below-ground allocation patterns, size of xylem vessels and leaf pubescence. Using the results of a field and simulation study with Artemisia tridentata in the Great Basin, USA, we propose an additional mechanism of water conservation that can be used by plants in arid and semi-arid environments following pulses of water availability. Precipitation redistributed more uniformly in the soil column by roots (hydraulic redistribution of water downward) slows the rate at which this water can subsequently be taken up by plants, thus prolonging water availability during periods of drought. By spreading out water more uniformly in the soil column at lower water potentials following precipitation events, water use is reduced due to lower soil conductivity. The greater remaining soil water and more uniform distribution result in higher plant predawn water potentials and transpiration rates later in the drought period. Simulation results indicate that plants can benefit during drought periods from water storage following both summer rain events (small summer pulses) and overwinter recharge (large spring pulse). This mechanism of water conservation may aid in sustaining active foliage, maintaining root-soil hydraulic connectivity, and increasing survival probability of plants which remain physiologically active during periods of drought.

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Acknowledgements

This work was funded by the National Science Foundation (DEB-9807097) and the Utah Agricultural Experiment Station. We thank Ann Mull for her excellent field assistance, Charles Ashurst for his electronics expertise, and Darrell Johnson for allowing us to establish our study site on his property in Rush Valley, Utah.

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Correspondence to R. J. Ryel.

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Ryel, R.J., Leffler, A.J., Peek, M.S. et al. Water conservation in Artemisia tridentata through redistribution of precipitation. Oecologia 141, 335–345 (2004). https://doi.org/10.1007/s00442-003-1421-2

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  • DOI: https://doi.org/10.1007/s00442-003-1421-2

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