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Functional diversity of leaf nitrogen concentrations drives grassland carbon fluxes

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Guderle,  Marcus
IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Gleixner,  Gerd
Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Hildebrandt,  Antje
FSU Jena Research Group Ecohydrology, Dr. A. Hildebrandt, Max Planck Institute for Biogeochemistry , Max Planck Society;

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Citation

Milcu, A., Roscher, C., Bachmann, D., Gockele, A., Guderle, M., Landais, D., et al. (2014). Functional diversity of leaf nitrogen concentrations drives grassland carbon fluxes. Ecology Letters, 17(4), 435-444. doi:10.1111/ele.12243.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-0C66-F
Abstract
Little is known about the role of plant functional diversity for ecosystem-level carbon (C) fluxes.
To fill this knowledge gap, we translocated monoliths hosting communities with four and 16 sown
species from a long-term grassland biodiversity experiment (‘The Jena Experiment’) into a controlled
environment facility for ecosystem research (Ecotron). This allowed quantifying the effects
of plant diversity on ecosystem C fluxes as well as three parameters of C uptake efficiency (water
and nitrogen use efficiencies and apparent quantum yield). By combining data on ecosystem C
fluxes with vegetation structure and functional trait-based predictors, we found that increasing
plant species and functional diversity led to higher gross and net ecosystem C uptake rates. Path
analyses and light response curves unravelled the diversity of leaf nitrogen concentration in the
canopy as a key functional predictor of C fluxes, either directly or indirectly via LAI and aboveground biomass.