|DOI / URL||link|
|Creative Commons Licence|
|Title (Primary)||Nitrogen but not phosphorus addition affects symbiotic N2 fixation by legumes in natural and semi-natural grasslands located on four continents|
|Author||Vázquez, E.; Schleuss, P.-M.; Borer, E.T.; Bugalho, M.N.; Caldeira, M.C.; Eisenhauer, N.; Eskelinen, A.; Fay, P.A.; Haider, S.; Jentsch, A.; Kirkman, K.P.; McCulley, R.L.; Peri, P.L.; Price, J.; Richards, A.E.; Risch, A.C.; Roscher, C.; Schütz, M.; Seabloom, E.W.; Standish, R.J.; Stevens, C.J.; Tedder, M.J.; Virtanen, R.; Spohn, M.|
|Journal||Plant and Soil|
|Topic||T5 Future Landscapes|
|Keywords||Grasslands; Legumes; Nitrogen addition; Nutrient Network (NutNet); Phosphorus addition; 15N natural abundance method|
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.
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.
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.
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.
|Persistent UFZ Identifier||https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26266|
|Vázquez, E., Schleuss, P.-M., Borer, E.T., Bugalho, M.N., Caldeira, M.C., Eisenhauer, N., Eskelinen, A., Fay, P.A., Haider, S., Jentsch, A., Kirkman, K.P., McCulley, R.L., Peri, P.L., Price, J., Richards, A.E., Risch, A.C., Roscher, C., Schütz, M., Seabloom, E.W., Standish, R.J., Stevens, C.J., Tedder, M.J., Virtanen, R., Spohn, M. (2022):
Nitrogen but not phosphorus addition affects symbiotic N2 fixation by legumes in natural and semi-natural grasslands located on four continents
Plant Soil 478 (1-2), 689 - 707