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Species richness of ectomycorrhizal (EM) fungi at root tips of Fagus sylvatica, Tilia spp., and Carpinus betulus. Cumulative data from EM fungal analysis in 240 soil cores collected on four different plots and four sampling dates. a Number of root tips and measured species richness in our study. Data were fitted by Boltzmann functions. b Number of root tips and species richness estimated with Chao 1 (settings = 50 runs, without replacement)
