Competition for phosphorus: Differential uptake from dual-isotope-labeled soil interspaces between shrub and grass

Martyn M. Caldwell, David M. Eissenstat, James H. Richards, Michael F. Allen

Research output: Contribution to journalArticle

103 Scopus citations

Abstract

Two species of Agropyron grass differed strikingly in their capacity to compete for phosphate in soil interspaces shared with a common competitor, the sagebrush Artemisia tridentata. Of the total phosphorus-32 and -33 absorbed by Artemisia, 86 percent was from the interspace shared with Agropyron spicatum and only 14 percent from that shared with Agropyron desertorum. Actively absorbing mycorrhizal roots of Agropyron and Artemisia were present itn both interspaces, where competition for the labeled phosphate occurred. The results have important implications about the way in which plants compete for resources below ground in both natural plant communities and agricultural intercropping systems.

Original languageEnglish (US)
Pages (from-to)384-386
Number of pages3
JournalScience
Volume229
Issue number4711
DOIs
StatePublished - Jan 1 1985

All Science Journal Classification (ASJC) codes

  • General

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