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Table 4 Results of mixed-effects models for effects of target tree initial basal area (BAinit), neighbourhood tree species richness (NSR), exponential Shannon index (eHS) and crown complementarity index (CCI) on basal area increment and wood volume increment with the neighbour selection approach “crown overlap” (n = 47)..: p < 0.1; *: p < 0.05; **: p < 0.01

From: Effects of local neighbourhood diversity on crown structure and productivity of individual trees in mature mixed-species forests

Fixed effects Basal area increment (log) Volume formula increment (log)
Estimate p R2C Estimate p R2C
NSR × BAinit.log 0.161 . 0.79 0.186 * 0.82
eHS × BAinit.log 0.177 * 0.80 0.205 ** 0.83
CCI × BAinit.log 0.116 . 0.76 0.110 . 0.78