E. Steep

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Influence of drought stress and fertilisation on carbon isotopes as indicators of water use of grassland differing in diversity.

Grassland in a changing world. Proceedings of the 23rd General Meeting of the European Grassland Federation, Kiel, Germany, 29th August - 2nd September 2010. (2010)

N. Wrage Ludwig J. Gauckler E. Steep Frank Küchenmeister Kai Küchenmeister

Methods • Permanent grassland (> 14 years old), Relliehausen, Solling, Germany (Fig. 2) • Hierarchical design: diversity = main plot, fertilisation and drought stress on subplots, n = 4 • Different diversity: herbicide treatment against dicots in autumn 2006 (‚non diverse‘; untreated: ‚diverse‘) • Drought: rainout shelters established for five weeks from beginning of May 2009 • Fertilisation: 90 kg N/ha, calcium ammonium nitrate, in April 2009 • Sampling: diversity, soil water content at harvest, biomass, δ13C

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