Competition for Phosphorus: Differential Uptake from Dual-isotope-labeled Interspaces Between Shrub and Grass

Document Type

Article

Journal/Book Title/Conference

Science

Publication Date

7-26-1985

Volume

229

Issue

4711

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 in 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.

First Page

384

Last Page

386

Link to Full Text

Share

COinS