Assessment of Population Dynamics Among Perennial Native Grasses Due to Interspecific Competition.

Abstract

Numerous North American native grass species are increasing in popularity stemming from a variety of uses across many different areas. Native warm-season grasses (NWSG), specifically: indiangrass (IG) [Sorghastrum nutans], big bluestem (BBS) [Andropogon gerardii], little bluestem (LBS) [Schizachyrium scoparium], and switchgrass (UPSG, LLSG) [Panicum virgatum] are increasing in popularity for improving summer forage production, wildlife habitat, and revegetation in the southeastern USA. There is interest in the potential for planting these in monoculture or polyculture systems based on the desired end goals. Scarcity of information about long-term population dynamics in these target species and the inherent effects on biodiversity and biomass yield limits more widespread acceptance. An experiment was conducted to assess population dynamics, yield, and long-term effects experienced by these target species when planted in mono and polyculture in varying percentages.