a negative trendp = 0.011
Post hoc analysis of the phylogenetic diversity‐productivity relationship indicated ecotype‐specific differences in slopes, with plots planted with the local MESIC‐ecotype exhibiting a strong positive productivity trend, whereas plots planted with the WET‐ecotype showed a negative trend (Δslope = 2.40 ± 0.73 SE, p = 0.011), indicating that local and non‐local seed sources differed in their phylogenetic community responses to productivity.