Neighbourhood-mediated shifts in tree biomass allocation drive overyielding in tropical species mixtures.

摘要: Variations in crown forms promote canopy space-use and productivity mixed-species forests. However, we have a limited understanding on how this response is mediated by changes within-tree biomass allocation. Here, explored the role of tree allometry, allocation architecture shaping diversity-productivity relationships (DPRs) oldest tropical diversity experiment. We conducted whole-tree destructive measurements terrestrial laser scanning. Spatially explicit models were built at level to investigate effects size local neighbourhood conditions. Results then upscaled stand level, mixture using bootstrapping procedure. Biomass substantially changed mixtures, which resulted from both tree-size neighbourhood-mediated plasticity. Shifts among branch orders explained substantial shares observed overyielding. By contrast, root-to-shoot ratios, as well allometric between basal area aboveground biomass, little affected neighbourhood. Our results suggest that generic equations can be used estimate forest overyielding diameter inventory data. Overall, demonstrate shifts are DPRs