Table 1.

Correlation of the species richness on each plot with time, mean richness and range of species richness using only richness values from the years 2001 to 2022. Note that none of the four correlation coefficients was significant and that fertilisation leads to a reduction of mean species richness despite considerable overlap in the ranges of species richness (see also Fig. 1b).

	r	P	Mean richness	Range richness
Farmland/fertilised	-0.17	0.32	25	18 - 35
Farmland/non-fertilised	0.07	0.67	41	27 - 57
Grassland/fertilised	0.25	0.34	23	17 - 29
Grassland/non-fertilised	0.31	0.31	38	29 - 49