Theory, R functions & Examples
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Example data, coming with the book of Šmilauer & Lepš (2014), originally published in Špačková et al. (1998)
Experimental data studying the effect of dominant species, plant litter and moss on species composition of wet meadow plant community, with special focus on seedling recruitment. The experiment was established in four randomised complete blocks, the treatment had four levels, and the community composition was measured once. The experiment was established in March 1994, shortly after snowmelt. Each of the four randomized blocks contained four plots, each with a different treatment: (1) control plot, where the vegetation remained undisturbed, (2) a plot with the removal of litter, (3) a plot with the removal of dominant species Nardus stricta, and (4) a plot with the removal of litter and mosses (to remove only mosses without litter was not technically possible).
Experiment was conducted in experimental wet meadow Ohrazení, located around 10 km SE of Ceske Budejovice, Czech Republic. The vegetation can be classified into alliances Molinion and Violion caninae.
|Name of variable||Description|
|MOWING||Mowing (each year in June or July)|
|FERTIL||Fertilized (65g NPK/m2)|
|REMOV||Dominant removal (Molinia caerulea) using screw-driver (conducted the first year and repeated every year if necessary)|
|YEAR||Year of observation (0 = 1994, i.e. before the experiment started, 1-3 = 1995-1997)|
|Yr0-Yr3||Year of observation (dummy variable)|
|P1-P24||Plot code (can be used as covariable)|
ohrazeni.spe <- read.delim ('http://www.davidzeleny.net/anadat-r/data-download/ohrazeni-spe.txt', row.names = 1) ohrazeni.env <- read.delim ('http://www.davidzeleny.net/anadat-r/data-download/ohrazeni-env.txt', row.names = 1)