IGN 13-10 - The increasing importance of nitrogen deposition and exotic grass invasions as a driver of responses to precipitation pulses in arid shrublands

Wednesday, August 9, 2017
C123, Oregon Convention Center
Holly Andrews, Department of Biology, University of California, Riverside and G. Darrel Jenerette, Department of Botany and Plant Sciences, University of California, Riverside, CA
Arid shrublands in the Southern California are increasingly inundated with drivers of global change, particularly dry nitrogen (N) deposition and exotic grass invasions. The dependence of both grass phenology and soil N processing on water availability suggest that plant and biogeochemical activity will become even more strongly connected to seasonal precipitation cycles as perennial, N-poor shrublands convert to annual, N-rich grasslands. In the context of pulse dynamics, Southern California aridlands may converge on increasingly pulsed ecosystem processes strongly driven by infrequent precipitation.