Location: Rangeland Resources Research
2012 Annual Report
1)leaf carbon metabolism;.
2)ecosystem scale CO2 and H2O exchange; and.
3)plant community restoration. Light- and dark-acclimated leaf respiration for the dominant perennial grass, western wheatgrass (Pascopyrum smithii), was determined. These measurements provide important mechanistic information about how climate change influences carbon exchange in semiarid rangelands. The measurements complement ongoing studies at PHACE examining ecosystem scale respiration and photosynthesis. In addition, efforts continue to monitor CO2 exchange at the plot level to examine how climate change impacts net carbon uptake. A new subexperiment was implemented within PHACE plots to examine success of restoration under different climate conditions. The work follows emergence and establishment of grass and forb species of different biogeographic origins across the northern and southern mixed-grass prairies in North America. Three graduate students are contributing to this research. The PHACE experimental treatments will be terminated in September 2013. Above and below ground biomass and soils will be harvested for analysis and disturbed plots will be restored. To ensure accountability of funds utilized, the ADODR and his staff hold meetings every 6 months with collaborators to discuss research and site issues; staff of both groups communicates regularly on experimental protocols, site management, and presentation of results. The group continues to coordinate on modeling and data base management efforts so the results of this work can be extrapolated by modeling projects involving project scientists and potential future collaborators.