Interactions between leaf traits and environmental factors enhance the
understanding of leaf habits in a subtropical forest
Abstract
It is well known that evergreen and deciduous species have different
functional traits and utilize different strategies in growth and
adaptation to environments, however little work has been done to
elucidate whether leaf habit mediate the effect of trait-environment
interactions on plant performance. Here we wanted to illuminate whether
relative growth rate of deciduous and evergreen species depended on
multiple trait-environment interactions. We measured eight leaf traits
of 1230 individuals from 25 species and collected topographic factors,
edaphic variables and competition index in a subtropic evergreen and
deciduous mixed forest. Then we modeled plant relative growth rate with
high-order trait-environment interactions for evergreen and deciduous
species respectively using generalized linear mixed model and visualized
the difference between leaf habits. Results showed that leaf habits were
divided by trait PC1 (41.8%) which was related to leaf lifespan and
resource acquisition. We found that trait-environment interactions
improved growth predictions for both leaf habits but the optimal models
for them were different. Moreover, the explanatory power of deciduous
species models was always higher than that of evergreens. These results
indicated that leaf habits with different life history strategies were
reflected by trait-environment interactions. We emphasized the
importance of leaf habits in explaining forest productivity and
functions, and future research should focus on the effects of leaf
habits on other demographic metrics and spatial patterns to solve the
coexistence of the two leaf habits in mixed forests.