Abstract: LTER - Long-Term Ecological Research Program/Cedar Creek Natural History Area (CDR) LTER/CDR025 [Summary adapted from the LTER Core Data Set Catalog]: The purpose of this experiment is to determine the effects of adding different levels of NH4NO3 at different times during the growing season. This experiment is being conducted inside the fenced areas of fields A and B. See CDR001 for description of fence construction. There are seven treatments: six combinations of three fertilization dates and two nitrogen levels, and one control. There are five replicates of each treatment for 35 plots in each field. The nitrogen levels are E, G, and I and are defined in NUTRADD.DOC in the "microplot" strategy. The times of fertilization are roughly May, June, or July. The plots are laid out in a 5 x 7 grid and are 1.5 m x 3.5 m in area. Aisles are 1 m wide in field A and 0.75 m wide in field B. Proprietary limits: Investigators have priority over data for five years, but are interested in collaboration for novel comparisons before then. The Cedar Creek Natural History Area (CCNHA) is a 2200 hectare experimental ecological reserve operated by the University of Minnesota in cooperation with the Minnesota Academy of Sciences. CCNHA is located in Anoka and Isanti Counties north of Minneapolis/St. Paul. The site was established in 1940, was designated a National Natural Landmark by the National Park Service in 1975. In 1977 it was included as an Experimental Ecology Reserve in a proposed network, and in 1982 it was one of 11 sites in the U.S. selected by the National Science Foundation for funding of LTER. Cedar Creek lies at the boundary of prairie and forest and is dominated by uplands of oak savanna, prairie, hardwood forest, pine forests, and abandoned agricultural fields and lowlands of ash and cedar swamps, acid bogs, marshes, and sedge meadows. Cedar Creek LTER combines long-term experimentation and observation to examine the controls of successional dynamics and spatial patterning in ecosystems at the prairie-forest boundary. The LTER has established more than 1100 permanent, long-term experimental plots as well as 2300 permanent observational plots distributed across 22 old fields. The work of the Cedar Creek LTER focuses on mechanisms of plant competition for nutrients and light; dynamics of carbon and nitrogen in soil; controls of the primary productivity, species competition and species diversity of grasslands; herbivory, including feedback effects of herbivores on soils and plants; disturbance; and modeling and ecological theory. Information about the Long-Term Ecological Research (LTER) Program can be obtained from: LTER Network Office College of Forest Resources AR-10 University of Washington Seattle, WA 98195 Phone: 206-543-4853 FAX: 206-685-0790 Email: Internet > office@lternet.edu or National Science Foundation Division of Environmental Biology Long-Term Projects in Environmental Biology Phone: 703-306-1479 ext. 6430 Email: scollins@nsf.gov Information about LTER is also available on-line on most gopher servers and is also available on the World Wide Web (WWW) at 'http://lternet.edu/' References: Inouye, R. S.; N. J. Huntly; D. Tilman. 1987. "Response of Microtus pennsylvanicus to vegetation fertilized with various nutrients, with particular emphasis on sodium and nitrogen concentrations in plant tissues". Holarctic Ecology, Vol. 10, pp. 110-113.
Purpose: The purpose of this experiment is to determine the effects of adding different levels of NH4NO3 at different times during the growing season.

Progress: in work
Update Frequency: as needed

Theme Keywords: GCMD parameter keywords, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >BIOGEOCHEMICAL CYCLES >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >BIOMASS >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >COMPETITION >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >HERBIVORY >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >NUTRIENT CYCLING >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >POPULATION DYNAMICS >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >PRIMARY PRODUCTION >, EARTH SCIENCE >BIOSPHERE >ECOLOGICAL DYNAMICS >SUCCESSION >, EARTH SCIENCE >BIOSPHERE >TERRESTRIAL HABITAT >FOREST HABITAT >, EARTH SCIENCE >BIOSPHERE >VEGETATION >FOREST COMPOSITION/STRUCTURE >, EARTH SCIENCE >BIOSPHERE >VEGETATION >HERBIVORY >, EARTH SCIENCE >BIOSPHERE >VEGETATION >NITROGEN >, EARTH SCIENCE >BIOSPHERE >VEGETATION >NUTRIENTS >, EARTH SCIENCE >BIOSPHERE >WETLANDS >MARSHES >, EARTH SCIENCE >LAND SURFACE >SOILS >ORGANIC MATTER >, none, CCNHA, CDR, CDR025, CEDAR CREEK, ECOSYSTEMS, FERTILIZATION, IDN_NODE GSFC/LTER_UMN, LTER, NH4NO3, NITROGEN, NSF, PHEN
Place Keywords: NORTH AMERICA

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