Brett Werner

a b s t r a c t Farms in the glaciated tallgrass prairie region of North America are topographically heterogeneous with wide-ranging soil quality. This environmental heterogeneity may affect choice and placement of species planted for biomass production. We designed replicated experiments and monitored farm-scale production to evaluate the effects of landscape position, vegetation type, and year on yields of monocultures and mixtures. Research was conducted on a 262-ha South Dakota working farm where cropland had been replanted with a variety of native grassland types having biofuel feedstock potential. Vegetation type (diverse mixture or switchgrass [Panicum virgatum L.] monoculture) and year interacted to influence yield in replicated experiments (p < 0.10). Mean annual switchgrass yield above a stubble height of 10 cm was 9.3 Mg ha −1 in two replicated experiments, and was greater than yield of mixtures (7.3 Mg ha −1 ) in 6 of 7 year × vegetation type combinations. Landscape p...

Support from the Henry Luce Foundation allowed a team of Centre College faculty to develop multiple integrated programs connecting the study of Asia to the environment: the Centre Summer Language Institute (CSLI), the Asia & the Environment Lab (A&E Lab), January term courses abroad, student summer research and internships abroad, and student dissemination of research. Each of these high-impact practices (HIPs) alone has been empirically demonstrated to enrich student experiences, but when linked in succession through a scaffolded framework, student learning was synergistically magnified. The personal growth, academic interests, and career trajectory of students who completed all stages of the scaffolded program were profoundly transformed. These experiences took place over a nearly 2-year period, culminating in the dissemination of student experiences to a national academic audience. We describe the guiding principles, programmatic structure, local and international partnerships, a...

The response of ecosystems to climate warming is likely to include threshold events when small changes in key environmental drivers produce large changes in an ecosystem. Wetlands of the Prairie Pothole Region (PPR) are especially sensitive to climate variability, yet the possibility that functional changes may occur more rapidly with warming than expected has not been examined or modeled. The productivity and biodiversity of these wetlands are strongly controlled by the speed and completeness of a vegetation cover cycle driven by the wet and dry extremes of climate. Two thresholds involving duration and depth of standing water must be exceeded every few decades or so to complete the cycle and to produce highly functional wetlands. Model experiments at 19 weather stations employing incremental warming scenarios determined that wetland function across most of the PPR would be diminished beyond a climate warming of about 1.5–2.0 °C, a critical temperature threshold range identified in other climate change studies.

... Page 3. © Brett Alan Werner 2006 Page 4. ... And I won't forget to mention Kalli, Annie, Abby, Sarah, Shelly, and the rest of the soccer girls that wanted to be mentioned in my acknowledgements— my soccer friends have kept me sane for a number of years, though I'm not sure how. ...

... Second, pragmatic ecocriticism foregrounds complexity, uncertainty, and ambiguity at the expense of simplistic dichotomies and dualisms. Third, these ecocritical approaches offer ... Ecocritics such as Daniel Philippon already recognize the effects of environmental ...