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Linear mixed-effects model of the effects of number of treatment years, site richness, log live biomass, log dead biomass, PAR, total species cover, and the number of added resources on diversity (ESNpie), with plot nested in block nested in site as random effects, using data from the maximum treatment year for each site, and the subset of 32 sites for which there was dead biomass and PAR data. Δ AIC between model with number of added resources and model without was 15, log-likelihood ratio 15.6, P < 0.0001.