Functional diversity of leaf nitrogen concentrations drives grassland carbon fluxes.

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.

journal_name

Ecol Lett

journal_title

Ecology letters

authors

Milcu A,Roscher C,Gessler A,Bachmann D,Gockele A,Guderle M,Landais D,Piel C,Escape C,Devidal S,Ravel O,Buchmann N,Gleixner G,Hildebrandt A,Roy J

doi

10.1111/ele.12243

subject

Has Abstract

pub_date

2014-04-01 00:00:00

pages

435-44

issue

4

eissn

1461-023X

issn

1461-0248

journal_volume

17

pub_type

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