University of Toledo’s Mike Weintraub returned to Imnavait Creek near Toolik Field Station last week for the first full season of tundra plot studies supported by his recent NSF grant. The project is one of a group of new research to be fielded at/near Toolik this year to study changing seasonality in the Arctic (CSAS). Specifically, Weintraub’s team is looking at how altered timing of seasonal events—earlier spring thaw and later fall freeze, for example—may affect nitrogen cycling in the soil, and how that in turn impacts tundra plant and microbe growth.
Polar Field Services staff returned to Toolik in late April for spring science support and station facilities projects. Among the larger science efforts, Jason Neely’s team placed about 3000 linear feet of boardwalk out on Imnavait Creek tundra manipulation plots for Weintraub’s CSAS soil nutrient experiment. The boardwalk protects the fragile, slow-growing tundra from the many footsteps of researchers visiting the plots to collect plants, data and/or to manipulate the conditions. The Weintraub team will continue working on the CSAS project for the length of the summer season at Toolik Field Station, departing in late August.
Weintraub heads an interdisciplinary collaboration composed of four other PIs: Paddy Sullivan (U Alaska), Josh Schimel (U California), Edward Rastetter (Marine Biological Laboratory), and Heidi Steltzer (Colorado State U).
Researchers will manipulate the timing of seasonally driven processes in tussock tundra ecosystems by advancing the timing of snowmelt with radiation-absorbing fabric placed over the snowpack in the late spring and by using open-top warming chambers in concert with advanced snowmelt. They will follow how seasonally driven plant and soil dynamics are affected by changes in the timing of snowmelt and warming.