Consequences of Elevated Sulfate Discharge to Fresh Surface Waters

press release: Sulfate is a relatively benign ion, but even low concentrations can lead to phytotoxic sulfide accumulation in sediment porewaters.  Sulfate reduction is often considered to be of minimal importance in freshwater systems, but can support "extra" mineralization of organic matter in anaerobic environments, with consequences for ecosystem health and stability.  Organic matter decomposition returns a number of compounds to the water column that would otherwise be sequestered in the sediments: nitrogen, phosphorous, and mercury; and generates dissolved organic carbon and alkalinity that can alter ecosystem structure.  This study is part of the State of Minnesota's investigation of the biogeochemistry behind the observed negative relationship between surface water sulfate and the distribution of wild rice, a culturally significant resource to many Native Americans, and Minnesota's state grain. 

The Yi-Fu Lecture Series features a wide variety of U.S. and international guest lecturers from all geographic disciplines. Lecturers at these Friday seminars also often speak at brown-bag lunches, one-on-one student sessions, and breakfast meetings with student interest groups as part of their visit. Doctoral students are invited to present their final research. The lecture series was initiated by Dr. Tuan and receives enthusiastic support as a department and campus tradition.

All lectures are presented on Friday at 3:30pm in Science Hall - Rm 180 unless otherwise noted. Alumni, friends and the public are always invited to attend.