Nitrogen enrichment modifies plant community structure via changes to plant-soil feedback

P. Manning, S. A. Morrison, M. Bonkowski, R. D. Bardgett

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We tested the hypothesis that N enrichment modifies plant-soil feedback relationships, resulting in changes to plant community composition. This was done in a two-phase glasshouse experiment. In the first phase, we grew eight annual plant species in monoculture at two levels of N addition. Plants were harvested at senescence and the effect of each species on a range of soil properties was measured. In the second phase, the eight plant species were grown in multi-species mixtures in the eight soils conditioned by the species in the first phase, at both levels of N addition. At senescence, species performance was measured as aboveground biomass. We found that in the first phase, plant species identity strongly influenced several soil properties, including microbial and protist biomass, soil moisture content and the availability of several soil nutrients. Species effects on the soil were mostly independent of N addition and several were strongly correlated with plant biomass. In the second phase, both the performance of individual species and overall community structure were influenced by the interacting effects of the species identity of the previous soil occupant and the rate of N addition. This indicates that N enrichment modified plant-soil feedback. The performance of two species correlated with differences in soil N availability that were generated by the species formerly occupying the soil. However, negative feedback (poorer performance on the soil of conspecifics relative to that of heterospecifics) was only observed for one species. In conclusion, we provide evidence that N enrichment modifies plant-soil feedback relationships and that these modifications may affect plant community composition. Field testing and further investigations into which mechanisms dominate feedback are required before we fully understand how and when feedback processes determine plant community responses to N enrichment. © 2008 Springer-Verlag.
    Original languageEnglish
    Pages (from-to)661-673
    Number of pages12
    JournalOecologia
    Volume157
    Issue number4
    DOIs
    Publication statusPublished - Oct 2008

    Keywords

    • Decomposition
    • Nitrogen deposition
    • Nutrient availability
    • Plant competition
    • Soil community

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