Functional diversity and identity of plant genotypes regulate rhizodeposition and soil microbial activity

Our understanding of the linkages between plant diversity and soil carbon nutrient cycling is primarily derived from studies at species level, while importance mechanisms effects genotype level are poorly understood. Here we examine how genotypic identity, associated variation in functional traits, within a common grass species, Anthoxanthum odoratum, modified rhizodeposition, microbial activity litter decomposition. Root quality was not significantly affected by diversity, but decomposition enhanced soils with legacy higher diversity. Plant identity rhizodeposition via two independent pathways. functioning positive on specific leaf area total rhizodeposition. Genotype both rhizodeposit quantity quality, these were mediated differences mean area, shoot mass height. Rhizodeposition more strongly predicted aboveground than belowground suggesting strong photosynthesis root exudation. study demonstrates that genotypes modulates supply representing an important overlooked pathway which biodiversity affects ecosystem functioning.