Consequences of the reduction of plant diversity for litter decomposition:effects through litter quality and microenvironment

Decomposition of plant litter is a key process for the flow of energy and n utrients in ecosystems that may be sensitive to the loss of biodiversity. T wo hypothetical mechanisms by which changes in plant diversity could affect litter decomposition are (1) through changes in litter species composition , and (2) by altering the decomposition microenvironment. We tested these i deas in relation to the short-term decomposition of herbaceous plant litter in experimental plant assemblages that differed in the numbers and types o f plant species and functional groups that they contained to simulate loss of plant diversity. We used different litterbag experiments to separate the two potential pathways through which diversity could have an effect on dec omposition. Our two litterbag trials showed that altering plant diversity affected litt er breakdown differently through changes in decomposition microenvironment than through changes in litter composition. In the decomposition microenvir onment experiment there was a significant but weak decline in decomposition rate in relation to decreasing plant diversity but no significant effect o f plant composition. The litter composition experiment showed no effect of richness but significant effects of composition, including large difference s between plant species and functional groups in litter chemistry and decom position rate. However, for a nested subset of our litter mixtures decompos ition was not accurately predicted from single-species bags; there were pos itive, non-additive effects of litter mixing which enhanced decomposition. We critically assess the strengths and limitations of our short-term litter bag trials in predicting the longer-term effects of changes in plant divers ity on litter decomposition rates.