Long-Term Ecological Research (LTER)/CDR015: Effect of NH4NO3 and Light Shading on Vegetation (UNFLN) at Cedar Creek Natural History Area

LTER - Long-Term Ecological Research Program/Cedar Creek Natural
History Area (CDR)

LTER/CDR015 [Summary adapted from the LTER Core Data Set Catalog]:

The purpose of this experiment is to measure the effect of NH4NO3
addition and light shading on vegetation under herbivore pressure.
This experiment is located in field B. The plots of this experiment
are those in CDR007 (UNFMC). Two factors are tested in this
experiment. A nitrogen addition factor with two levels and a light
penetration factor with two levels. Nitrogen addition levels are I
and G (see NUTRADD.DOC). The light penetration levels are 1 (100%
light penetration) and 2 (20% light penetration). The light
penetration levels are achieved by using a black shade, reducing light
penetration by 80%. The support for the shades is made of steel
T-posts and 2 x 4 lumber. There are 12 replicates of the four
treatments. Each plot is 2 m x 2 m. The treatments were laid out in a
randomized block arranged in a split plot design where nitrogen was
assigned to the main plot and light penetration assigned to subplots.

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.

Information about LTER is also available at
'http://lternet.edu/'