Factors associated with plant species richness in a coastal tall-grass prairie
Article first published online: 24 FEB 2009
2000 IAVS - the International Association of Vegetation Science
Journal of Vegetation Science
Volume 11, Issue 3, pages 443–452, June 2000
How to Cite
Grace, J. B., Allain, L. and Allen, C. (2000), Factors associated with plant species richness in a coastal tall-grass prairie. Journal of Vegetation Science, 11: 443–452. doi: 10.2307/3236637
- Issue published online: 24 FEB 2009
- Article first published online: 24 FEB 2009
- Received 15 May 1999; Revision received 8 November 1999; Accepted 1 December 1999. Coordinating Editor: S. Díaz.
- Environmental effect;
- Species pool
- NRCS 1999
Abstract. In this study we examine the factors associated with variations in species richness within a remnant tall-grass prairie in order to gain insight into the relative importance of controlling variables. The study area was a small, isolated prairie surrounded by wetlands and located within the coastal prairie region, which occurs along the northwestern Gulf of Mexico coastal plain. Samples were taken along three transects that spanned the prairie. Parameters measured included micro-elevation, soil characteristics, indications of recent disturbance, above-ground biomass (including litter), light penetration through the plant canopy, and species richness. Species richness was found to correlate with micro-elevation, certain soil parameters, and light penetration through the canopy, but not with above-ground biomass. Structural equation analysis was used to assess the direct and indirect effects of micro-elevation, soil properties, disturbance, and indicators of plant abundance on species richness. The results of this analysis showed that observed variations in species richness were primarily associated with variations in environmental effects (from soil and microtopography) and were largely unrelated to variations in measures of plant abundance (biomass and light penetration). These findings suggest that observed variations in species richness in this system primarily resulted from environmental effects on the species pool. These results fit with a growing body of information that suggests that environmental effects on species richness are of widespread importance.