The dataframe Ossenkampen contains the data from
a long-term fertilizer experiment (1958-2007) in grassland with 98 response variables
(abundances of the plant species that grew in the Ossenkampen plots, measured as counts in 100 subsamples),
as analysed in ter Braak (2023).
The experiment started in 1958 with 12 plots arranged in two randomized complete blocks with six treatments: four types of fertilizer (K, P, PK or NPK), liming and no fertilizer. Eight years later (in 1966) each block was extended with two plots, one with N and another with NPK fertilization. The two limed plots behaved rather differently from the rest and are omitted here. In this data, the K and P plots are combined with the no fertilizer plots so that the control treatment (Cntrl) consisted of 6 plots, with the aim to make the variability among replicates more interesting. Three plots of the control and one PK plot were not sampled in 1967 and two NPK samples were not sampled in 1984; these missing samples were not imputed in this data set.
The data analyzed in Berendse et al. (2021) also contained the limed plots and contained, for the multivariate analyses, imputations of the few missing samples after 1966.
Sample numeric identifier for a sample
Plot identifier for a sample (the identifier details the fertilizer treatment and Block)
Block numeric identifier of the block (1 or 2)
A year of sampling
B fertilizer treatment, condensed to four treatments ("Cntrl" is the referencelevel)
AgrCap count out of 100 subsamples of species AgrCap, and so on for the remaining 97 species
Berendse, F., Geerts, R.H.E.M., Elberse, W.T., Bezemer, T.M., Goedhart, P.W., Xue, W., Noordijk, E., ter Braak, C.J.F. & Korevaar, H. (2021) A matter of time: Recovery of plant species diversity in wild plant communities at declining nitrogen deposition. Diversity and Distributions, 27, 1180-1193. https://doi.org/10.1111/ddi.13266
Geerts, R.H.E.M., Bufe, C., Schils, P.C., Korevaar, H., Berendse, F. & Struik, P.C. (2021) The Ossekampen Grassland Experiment: Data underlying the publication: A matter of time: recovery of plant species diversity in wild plant communities at declining nitrogen deposition. https://doi.org/10.4121/13200398
ter Braak, C.J.F. (2023) Redundancy analysis includes analysis of variance-simultaneous component analysis (ASCA) and outperforms its extensions. Chemometrics and Intelligent Laboratory Systems, 104898. https://doi.org/10.1016/j.chemolab.2023.104898