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要旨:
Light partitioning is often invoked as 2 a mechanism for positive plant diversity effects on ecosystem functioning. Yet evidence for an improved distribution of foliage in space or time in
4 diverse plant communities remains scarce and restricted mostly to temperate grasslands. Here we
identify the mechanisms through which tree species diversity affects community-level light capture
6 in a biodiversity experiment with tropical trees that displays overyielding, i.e. enhanced biomass
production in mixtures. Using a combination of empirical data, mechanistic models and
8 statistical tools, we develop innovative methods to test for the isolated and combined effects of
architectural and temporal niche differences among species as well as plastic changes in crown
10 shape within species. We show that all three mechanisms enhanced light capture in mixtures and
that temporal niche differences were the most important driver of this result in our seasonal
12 tropical system. Our study mechanistically demonstrates that niche differences and phenotypic
plasticity can generate significant biodiversity effects on ecosystem functioning in tropical forests.
14 Keywords: Biodiversity; Ecosystem functioning; Phenology; Niche differences; Tree; Plantation; Light competition; Crown; Sardinilla project; Phenotypic plasticity; Intraspecific diversity; 16 Overyielding.
