Larger phylogenetic distances in litter mixtures: lower microbial biomass and higher C/N ratios but equal mass loss

Xu Pan, M.P. Berg, O. Butenschoen, P.J. Murray, I.V. Bartisch, J.H.C. Cornelissen, Ming Dong, A. Prinzing

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Phylogenetic distances of coexisting species differ greatly within plant communities, but their consequences for decomposers and decomposition remain unknown. We hypothesized that large phylogenetic distance of leaf litter mixtures increases differences of their litter traits, which may, in turn, result in increased resource complementarity or decreased resource concentration for decomposers and hence increased or decreased chemical transformation and reduction of litter. We conducted a litter mixture experiment including 12 common temperate tree species (evolutionarily separated by up to 106 Myr), and sampled after seven months, at which average mass loss was more than 50%. We found no effect of increased phylogenetic distance on litter mass loss or on abundance and diversity of invertebrate decomposers. However, phylogenetic distance decreased microbial biomass and increased carbon/nitrogen (C/N) ratios of litter mixtures. Consistently, four litter traits showed (marginally) significant phylogenetic signal and in three of these traits increasing trait difference decreased microbial biomass and increased C/N. We suggest that phylogenetic proximity of litter favours microbial decomposers and chemical transformation of litter owing to a resource concentration effect. This leads to a new hypothesis: closely related plant species occurring in the same niche should promote and profit from increased nutrient availability.
Original languageEnglish
Article number20150103
Number of pages9
JournalProceedings of the Royal Society of London. Series B, Biological Sciences
Volume282
Issue number1806
Early online date15 Apr 2015
DOIs
Publication statusPublished - 2015

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