Browsing by Subject "sulfide"
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Item Iron and Sulfur Cycling in the Rhizosphere of Wild Rice (Zizania palustris)(2016-08) LaFond-Hudson, SophiaWild rice (Zizania palustris), an annual macrophyte with significant cultural, economic, and ecological value, grown in high sulfate develops black iron sulfide precipitates on root surfaces, and produces fewer and lighter seeds, leading to decreased populations long-term. To investigate the role of iron sulfide precipitates in impaired seed production, wild rice plants grown in buckets were exposed to 300 mg/L of sulfate, and harvested biweekly for extraction of root acid volatile sulfide (AVS) and weak acid extractable iron and analysis of plant and seed N. In sulfate-amended plants, root AVS accumulated rapidly just prior to seed production. Simultaneously, iron speciation of the root precipitate shifted from Fe(III) to Fe(II), consistent with a transition from iron (hydr)oxide to iron sulfide. Sulfate-amended plants produced fewer, lighter seeds with less nitrogen. It is suggested that sulfide inhibits N uptake, causing rapid AVS accumulation during the reproductive life stage to disproportionately harm seed production.Item Minnesota Pollution Control Agency Wild Rice Sulfate Standard Field Study: water, sediment, porewater, and observational data collected across Minnesota 2011-2013(2017-04-10) Myrbo, Amy; amyrbo@umn.edu; Myrbo, AmyThis study was undertaken by the Minnesota Pollution Control Agency (MPCA) and University of Minnesota to improve the understanding of why wild rice (Zizania palustris, manoomin, psin) is observed to thrive only in waters with low sulfate (SO4), and to contribute to evaluation of Minnesota Rules 7050.0224, promulgated in 1973, which seeks to limit the exposure of wild rice to sulfate concentrations exceeding 10 mg/L. The dataset is now released as manuscripts using it are being published.Item Minnesota Pollution Control Agency Wild Rice Sulfate Standard Mesocosm Study: Water, Sediment, and Porewater "Synoptic" Sampling 2013 and 2015(2017-05-30) Myrbo, Amy; amyrbo@umn.edu; Myrbo, AmyThis dataset represents opportunistic, "synoptic" sampling of 30 experimental mesocosms for chemical parameters. The mesocosm experiments were undertaken by Dr. John Pastor (UMN-Duluth) and the Minnesota Pollution Control Agency (MPCA) to improve the understanding of why wild rice (Zizania palustris, manoomin, psin) is observed to thrive only in waters with low sulfate (SO4), and to contribute to evaluation of Minnesota Rules 7050.0224, promulgated in 1973, which seeks to limit the exposure of wild rice to sulfate concentrations exceeding 10 mg/L.The dataset is now released as manuscripts using it are being published.