<p>Study design In the Reijerscamp Natuurmonumenten established a large
field experiment in 2006. There were four experimental areas (Area A-D).
In each area large top-soil excavations were made down to the minaral
soil (top-soil removal (rem) & untreated controls (cont)). In each
of the excavated areas treatments were performed where 1) sods were
added (sod), 2) where mixed soil was spead out (soil), and there was a
control where nothing further had been done (cont) all additions
were collected from well-developped seminatural sites (sods: Doorwerthse
Heide, Wolfheze, Soil: Dennenkamp, Planken Wambuis) Outside the
excavations the soil & control treatments were also performed just
as inside the top-soil excavations. The sod addition treatment was not
performed outside the top soil excavations . Hence in total there were 4
experimental areas, with 5 treatments each, creating 20 sampling
locations. Within each sampling location a transect of 5 plots was laid
out, with the centre plot in the middle of the sampling location. The
orientation of the transect was decided randomly as far a the size of
the treatment in each sampling location permitted (see tab 'transect
orientation' in the primary data files). Each plot was 1x1m and the
spacing between plot edges was 5 m (hence each transect from the far
edges of plot 1 & 5 spans 25 m). All data in the primary data files
were sampled in this way. </p>