Figure legends
Figure 1 | Conceptual diagram of how functional trait
dispersion and identity influences the tree mixture effect on
productivity, both across and within species richness levels. (A)
Mixtures (representing by circles) consisting of different species are
distributed along the gradient of species richness in mixtures (SR),
functional dispersion (FD), and functional identity (from conservative
to acquisitive). The blue area (a) demonstrates species mixtures with
increasing FDis or acquisitive strategies across the SR levels.
Alternatively, the green area (b) demonstrates species mixtures with low
variation of FDis or acquisitive strategies across the SR levels. The
red area demonstrates species mixtures with increasing FDis or
acquisitive strategies at a constant SR level. (B) The different lines
are our predictions according to the different situations in panel A.
The blue line (a) assumes a positive relationship between lnRR and SR
with increasing FDis or acquisitive strategies. The green dashed line
(b) assumes a nonsignificant relationship between lnRR and SR, with a
low variation of FDis or acquisitive strategies. The red line (c)
assumes a positive relationship between lnRR with increasing FDis or
acquisitive strategies at a constant SR level.
Figure 2 | Global distribution of the 59 studies
included in the meta-analysis.
Figure 3 | Relationship between species richness with
plant functional dispersion (a) and with the tree mixture effects on
productivity (b). Dashed and solid blue lines are non-significant and
significant mixed-effects models fit across all studies, respectively.
Light blue bands represent 95% confidence intervals. The sizes of the
circles represent the relative weights of corresponding observations.
Curves with their 95% confidence interval (shaded) were estimated by
partial regressions, with corresponding levels of significance
(P ). All numerical variables were natural log-transformed.
Figure 4 | Relationship between the tree mixtures on
productivity (lnRR) with multidimensional functional dispersion (a), and
with single trait dispersion (b-d). Blue lines are mixed-effects models
fit across species richness levels. Light blue bands represent 95%
confidence intervals. Red, green, and yellow lines are mixed-effects
models fit within two-, three-, and four-species mixtures, respectively.
The sizes of the circles represent the relative weights of corresponding
observations. Curves with their 95% confidence interval (shaded) were
estimated by partial regressions with corresponding levels of
significance (P ). All numerical variables were natural
log-transformed.
Figure 5 | Relationship between the effects of tree
mixtures on productivity with the CWM of species mixtures. (a) Leaf
nitrogen content (LNC). (b) Specific leaf area (SLA). (c) Wood density
(WD). Blue lines represent mixed-effects models fit across species
richness levels. Light blue bands represent 95% confidence intervals.
Red, green, and yellow lines are mixed-effects models fit within two- ,
three-, and four-species mixtures, respectively. The sizes of the
circles represent the relative weights of corresponding observations.
Curves with their 95% confidence interval (shaded) were estimated by
partial regressions with corresponding levels of significance
(P ). All numerical variables were natural log-transformed.
Figure 1