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Plant and Soil

, Volume 412, Issue 1–2, pp 177–188 | Cite as

Competition from Bromus tectorum removes differences between perennial grasses in N capture and conservation strategies

  • Jeffrey T. Walker
  • Jeremy J. James
  • Rebecca E. DrenovskyEmail author
Regular Article

Abstract

Background and aims

Competition from the annual grass Bromus tectorum threatens aridland perennial bunchgrass communities. Unlike annuals, perennials must allocate part of their first year nitrogen (N) budget to storage rather than growth, potentially placing them at a competitive disadvantage.

Methods

We evaluated N acquisition and conservation for two perennial bunchgrasses, Agropyron desertorum and Pseudoroegneria spicata, at the seedling stage to investigate potential trade-offs between storage and growth when grown with and without B. tectorum under two levels of soil N.

Results

Agropyron desertorum had higher growth rates, N uptake, and N productivity than P. spicata when grown without B. tectorum, but trait values were similarly low for both species under competition. Without competition, N resorption was poor under high soil N, but it was equally proficient among species under competition.

Conclusions

A. desertorum had higher growth rates and N productivity than P. spicata without competition, suggesting these traits may in part promote its greater success in restoration programs. However, B. tectorum neighbors reduced its trait advantage. As plant traits become more integral to restoration ecology, understanding how N capture and conservation traits vary across candidate species and under competition may improve our ability to select species with the highest likelihood of establishing in arid, nutrient-limited systems.

Keywords

Drylands Low nutrient adapted species Nitrogen productivity Resorption 

Notes

Acknowledgments

We thank L. Ziegenhagen, EOARC interns, and Drenovsky lab members for help with plant maintenance and sample processing; J. Johansen, C. Muller, and C. Sheil for manuscript review; and the United States Department of Agriculture—Agricultural Research Service and the John Carroll University College of Arts and Sciences for funding.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Jeffrey T. Walker
    • 1
  • Jeremy J. James
    • 2
    • 3
  • Rebecca E. Drenovsky
    • 1
    Email author
  1. 1.Biology DepartmentJohn Carroll UniversityUniversity HeightsUSA
  2. 2.USDA-Agricultural Research ServiceEastern Oregon Agricultural Research CenterBurnsUSA
  3. 3.Sierra Foothill Research and Extension CenterBrowns ValleyUSA

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