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Journal article
Nitrogen but not phosphorus addition affects symbiotic N2 fixation by legumes in natural and semi-natural grasslands located on four continents
Plant and Soil, Vol.478, pp.689-707
2022
Abstract
Background and aims
The amount of nitrogen (N) derived from symbiotic N2 fixation by legumes in grasslands might be affected by anthropogenic N and phosphorus (P) inputs, but the underlying mechanisms are not known.
Methods
We evaluated symbiotic N2 fixation in 17 natural and semi-natural grasslands on four continents that are subjected to the same full-factorial N and P addition experiment, using the 15N natural abundance method.
Results
N as well as combined N and P (NP) addition reduced aboveground legume biomass by 65% and 45%, respectively, compared to the control, whereas P addition had no significant impact. Addition of N and/or P had no significant effect on the symbiotic N2 fixation per unit legume biomass. In consequence, the amount of N fixed annually per grassland area was less than half in the N addition treatments compared to control and P addition, irrespective of whether the dominant legumes were annuals or perennials.
Conclusion
Our results reveal that N addition mainly impacts symbiotic N2 fixation via reduced biomass of legumes rather than changes in N2 fixation per unit legume biomass. The results show that soil N enrichment by anthropogenic activities significantly reduces N2 fixation in grasslands, and these effects cannot be reversed by additional P amendment.
Details
- Title
- Nitrogen but not phosphorus addition affects symbiotic N2 fixation by legumes in natural and semi-natural grasslands located on four continents
- Authors/Creators
- E. Vazquez (Author/Creator) - University of BayreuthP-M Schleuss (Author/Creator)E.T. Borer (Author/Creator)M.N. Bugalho (Author/Creator)M.C. Caldeira (Author/Creator)N. Eisenhauer (Author/Creator)A. Eskelinen (Author/Creator)P.A. Fay (Author/Creator)S. Haider (Author/Creator)A. Jentsch (Author/Creator)K.P. Kirkman (Author/Creator)R.L. McCulley (Author/Creator)P.L. Peri (Author/Creator)J. Price (Author/Creator)A.E. Richards (Author/Creator)A.C. Risch (Author/Creator)C. Roscher (Author/Creator)M. Schutz (Author/Creator)E.W. Seabloom (Author/Creator)R.J. Standish (Author/Creator)C.J. Stevens (Author/Creator)M.J. Tedder (Author/Creator)R. Virtanen (Author/Creator)M. Spohn (Author/Creator)
- Publication Details
- Plant and Soil, Vol.478, pp.689-707
- Publisher
- Springer Nature
- Identifiers
- 991005544518507891
- Copyright
- © 2022 The Authors.
- Murdoch Affiliation
- College of Science, Health, Engineering and Education
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.97 Plant Pathology
- 3.97.892 Rhizobium-Legume Symbiosis
- Web Of Science research areas
- Agronomy
- Plant Sciences
- Soil Science
- ESI research areas
- Agricultural Sciences