HERBACEOUS COVER AND BIOMASS OF CAREX PLANOSTACHYS IN JUNIPERUS ASHEI WOODLANDS OF CENTRAL TEXAS

In the understory of many Juniperus woodlands, herbaceous cover and biomass are reduced or eliminated compared to interstitial grasslands. However, there are some exceptions. Carex planostachys (cedar sedge) is a widespread herbaceous species associated with J. ashei and occurs in the understory of these woodlands in central Texas. The purpose of this paper was to compare cover and biomass of herbaceous vegetation along a gradient from below the canopy off ashei into an associated intercanopy patch or grassland. Levels of light are reduced below the canopy, whereas litter and moisture in the soil are higher. Cover and biomass of C. planostachys were higher below the J. ashei canopy and canopy edge. Total cover and biomass of grasses were higher in the intercanopy at elevated levels of light, reduced litter, and lower soil moisture. Spatial distribution of C. planostachys below the canopy suggests that this species is tolerant of shade and may require a woodland canopy for growth and development.