Lichen responses to nitrogen and phosphorus additions can be explained by the different symbiont responses
Article first published online: 28 APR 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 191, Issue 3, pages 795–805, August 2011
How to Cite
Johansson, O., Olofsson, J., Giesler, R. and Palmqvist, K. (2011), Lichen responses to nitrogen and phosphorus additions can be explained by the different symbiont responses. New Phytologist, 191: 795–805. doi: 10.1111/j.1469-8137.2011.03739.x
- Issue published online: 20 JUL 2011
- Article first published online: 28 APR 2011
- Received: 7 February 2011, Accepted: 20 March 2011
- chlorophyll a;
- epiphytic lichens;
- fertilization experiment;
- growth rate;
- nitrogen deposition;
- nutrient limitation;
- •Responses to simulated nitrogen (N) deposition with or without added phosphorus (P) were investigated for three contrasting lichen species – the N-sensitive Alectoria sarmentosa, the more N-tolerant Platismatia glauca and the N2-fixing Lobaria pulmonaria– in a field experiment.
- •To examine whether nutrient limitation differed between the photobiont and the mycobiont within the lichen, the biomass responses of the respective bionts were estimated.
- •The lichenized algal cells were generally N-limited, because N-stimulated algal growth in all three species. The mycobiont was P-limited in one species (A. sarmentosa), but the growth response of the mycobionts was complex, as fungal growth is also dependent on a reliable carbon export from the photobiont, which may have been the reason for the decrease of the mycobiont with N addition in P. glauca.
- •Our findings showed that P availability was an important factor when studying effects of N deposition, as P supply can both mitigate and intensify the negative effects of N on epiphytic lichens.