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Community Ecology

, Volume 7, Issue 2, pp 235–244 | Cite as

The effect of Juniperus virginiana on plant species composition in an Oklahoma grassland

  • J. S. Linneman
  • M. W. PalmerEmail author
Article

Abstract

We established transects under twenty Juniperus virginiana trees that invaded an unburned central Oklahoma grassland within the last 20 years to determine their effects on plant species composition. Species richness and stem density increased as distance from the trunk increased. Stem density was also higher towards the south side of trees. Graminoid, forb and total cover were related to distance from the trunk and transect direction. Ordination revealed weak compositional gradients related to “openness” and compass direction. Woody species tended to be most abundant underneath J. virginiana canopies whereas grass and forb species were most abundant in the prairie. Woody and shadetolerant species preferentially occurred in north transects and quadrats underneath the tree. Conversely, forbs had highest abundance on edge quadrats whereas graminoids dominated south transects and prairie quadrats. Thus, invasion of grasslands by J. virginiana influences species composition in a spatially complex manner.

Keywords

Invasion Juniperus virginiana Oklahoma Tallgrass prairie 

Abbreviations

DBH

Diameter at Breast Height

pCCA

partial Canonical Correspondence Analysis

Nomenclature

USDA NRCS (2004) 

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Copyright information

© Akadémiai Kiadó, Budapest 2006

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  1. 1.Department of BotanyOklahoma State UniversityStillwaterUSA

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