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Oecologia

, Volume 192, Issue 1, pp 55–66 | Cite as

Identification of suites of traits that explains drought resistance and phenological patterns of plants in a semi-arid grassland community

  • T. W. OcheltreeEmail author
  • K. M. Mueller
  • K. Chesus
  • D. R. LeCain
  • J. A. Kray
  • D. M. Blumenthal
Physiological ecology – original research

Abstract

Grassland ecosystems are comprised of plants that occupy a wide array of phenological niches and vary considerably in their ability to resist the stress of seasonal soil–water deficits. Yet, the link between plant drought resistance and phenology remains unclear in perennial grassland ecosystems. To evaluate the role of soil water availability and plant drought tolerance in driving phenology, we measured leaf hydraulic conductance (Ksat), resistance to hydraulic failure (P50), leaf gas exchange, plant and soil water stable isotope ratios (δ18O), and several phenology metrics on ten perennial herbaceous species in mixed-grass prairie. The interaction between P50 and δ18O of xylem water explained 67% of differences in phenology, with lower P50 values associated with later season activity, but only among shallow-rooted species. In addition, stomatal control and high water-use efficiency also contributed to the late flowering and late senescence strategies of plants that had low P50 values and relied upon shallow soil water. Alternatively, plants with deeper roots did not possess drought-tolerant leaves, but had high hydraulic efficiency, contributing to their ability to efficiently move water longer distances while maintaining leaf water potential at relatively high values. The suites of traits that characterize these contrasting strategies provide a mechanistic link between phenology and plant–water relations; thus, these traits could help predict grassland community responses to changes in water availability, both temporally and vertically within the soil profile.

Keywords

Drought tolerance Leaf hydraulic conductance Phenology P50 Rooting depth Semi-arid grassland Water isotopes Water-use strategies 

Notes

Acknowledgements

We would like to acknowledge the ARS Rangeland Resources and Systems Research unit for access to facilities at the High Plains Grassland Research Station in Cheyenne, WY. We also want to thank Julie Bushey and Mary Carlson for their energetic assistance and good humor during field work, and the thoughtful comments from the anonymous reviewers of our manuscript.

Author contribution statement

TO developed the idea and hypotheses of the project; TO, KM, and DB designed the experiment; TO, KM, DB, DL, JK, and KC collected and analyzed the data. TO led the writing of the manuscript with editing and intellectual contributions from KM, DB, JK, and KC.

Supplementary material

442_2019_4567_MOESM1_ESM.pdf (581 kb)
Supplementary material 1 (PDF 581 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Department of Forest and Rangeland StewardshipColorado State UniversityFort CollinsUSA
  2. 2.Biological, Geological, and Environmental Sciences, Cleveland State UniversityClevelandUSA
  3. 3.Rangeland Resources and Systems Research UnitUSDA-ARSFort CollinsUSA

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