Summary
This global meta-analysis of 8,450 paired observations from 328 studies demonstrates that mixed-species forest plantations significantly enhance plant biomass accumulation and nutrient cycling relative to monocultures across diverse climatic zones and stand structures. The beneficial effects of species mixing were modulated by environmental context, with stronger outcomes in warmer, wetter climates and increasing with species richness, whilst showing unimodal relationships with elevation, stand age and density. These findings support mixed-species plantations as a silvicultural approach to improve ecosystem function and support forest restoration.
Regional applicability
Findings are geographically global in scope. Application to United Kingdom conditions would be most relevant for temperate maritime climates; the meta-analysis indicates moderate effects in cooler climates compared to warmer zones, so UK plantation managers should expect benefits of species mixing but potentially smaller magnitude than in tropical or subtropical contexts.
Key measures
Plant biomass (trees, shrubs, litterfall, above- and belowground compartments); soil organic carbon; total nitrogen; phosphorus availability; microbial biomass; leaf nutrient content; soil stoichiometric ratios
Outcomes reported
The study quantified the effects of species mixing on plant biomass accumulation, soil nutrient content (carbon, nitrogen, phosphorus), microbial biomass, and leaf nutrient composition compared to monoculture plantations. Effects were examined across multiple ecosystem compartments and examined how outcomes vary by climate, elevation, stand age, species richness and stand density.
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