Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Root Systems, Spatial Patterns, and Competition for Soil Moisture between Two Desert Subshrubs

Sara J. Manning and Michael G. Barbour
American Journal of Botany
Vol. 75, No. 6 (Jun., 1988), pp. 885-893
Stable URL: http://www.jstor.org/stable/2444008
Page Count: 9
  • Read Online (Free)
  • Download ($12.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Root Systems, Spatial Patterns, and Competition for Soil Moisture between Two Desert Subshrubs
Preview not available

Abstract

Haplopappus cooperi and Chrysothamnus teretifolius are important elements on alluvial fans in the Owens Valley of California. Selective removal field experiments, followed for 7 months, revealed that Haplopappus predawn water potentials were significantly less negative after removal of neighboring plants of either species, whereas Chrysothamnus predawn water potentials were unchanged, compared to controls. Haplopappus also showed a more dramatic response in water potential following supplemental watering at the end of the dry season. Excavations showed that the root systems of the two species were different: the majority of Haplopappus root biomass was within the upper 20 cm of soil, but for Chrysothamnus it was below 40 cm depth. Spatial pattern was not always a reliable predictor of biotic interaction in this desert community: Chrysothamnus individuals were aggregated, Haplopappus individuals were distributed at random, and plants of the two species were randomly associated.

Page Thumbnails

  • Thumbnail: Page 
885
    885
  • Thumbnail: Page 
886
    886
  • Thumbnail: Page 
887
    887
  • Thumbnail: Page 
888
    888
  • Thumbnail: Page 
889
    889
  • Thumbnail: Page 
890
    890
  • Thumbnail: Page 
891
    891
  • Thumbnail: Page 
892
    892
  • Thumbnail: Page 
893
    893