Nitrogen (N) enrichment has been pinpointed as a main driver for biodiversity change. Most of our knowledge of effects of increased N availability on ecosystems comes from northern Europe and America. Most other ecosystem types have been neglected. Although Mediterranean ecosystems are N-limited biodiversity hotspots, very little is known about the effects of N enrichment in these systems. In contribution to filling this gap, our study examined the short-term effects of N enrichment in a N-manipulation (doses and forms) field study of a severely nutrient-limited Mediterranean ecosystem located in a Natura 2000 site in Portugal. N availability (dose and forms) was modified by the addition of 40 and 80 kg N ha-1year-1as NH4NO3or 40 kg N as NH4+ha-1year-1(control plots are not fertilized) since January 2007. The studied ecosystem was highly N responsive, i.e., visible changes were seen within one year of N additions: vascular plant and soil microbial diversity (soil bacteria and arbuscular mycorrhizal fungal spores) increased. Also the N concentration in leaves and litter increased, while the carbonto- nitrogen (C/N) ratio of leaves and litter decreased.
CITATION STYLE
Dias, T., Chaves, S., Tenreiro, R., Martins-Loução, M. A., Sheppard, L. J., & Cruz, C. (2014). Effects of increased nitrogen availability in mediterranean ecosystems: A case study in a natura 2000 site in Portugal. In Nitrogen Deposition, Critical Loads and Biodiversity: Proceedings of the International Nitrogen Initiative Workshop, Linking Experts of the Convention on Long-Range Transboundary Air Pollution and the Convention on Biological Diversity (pp. 251–258). Springer Netherlands. https://doi.org/10.1007/978-94-007-7939-6_27
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