Long-term dynamics of aboveground fungal communities in a subalpine Norway spruce forest under elevated nitrogen input |
| |
Authors: | François Gillet Martina Peter François Ayer Rita Bütler Simon Egli |
| |
Institution: | 1. CNRS, UMR 6249 Chrono-environnement, Université de Franche-Comté, 16 route de Gray, 25030, Besan?on Cedex, France 2. Ecological Systems Laboratory, Ecole Polytechnique Fédérale de Lausanne, Station 2, 1015, Lausanne, Switzerland 3. Swiss Federal Research Institute WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland
|
| |
Abstract: | As anthropogenic N deposition has been suspected to be the main reason for the decline of macromycetous sporocarp production
in forest ecosystems, various N-fertilization experiments were started in the mid 1990s. The dynamics of ectomycorrhizal (root-inhabiting)
and terricolous saprobic (litter-inhabiting) fungal communities were studied by exhaustive sporocarp inventories in a substitution
Norway spruce (Picea abies) forest in two 256-m2 plots sampled for periods of 1 week at 1-m2 resolution between 1994 and 2007. N was added to the soil twice per year in one plot from the fourth year onwards. The effects
of N input and time on aboveground fungal communities were assessed using redundancy analysis, principal response curves and
non-parametric multivariate ANOVA. Results of this long-term experiment revealed that both ectomycorrhizal and saprobic fungal
communities responded to an increase in soil N input. The ectomycorrhizal community reacted by a fast decrease in sporocarp
production and in species richness, whereas the saprobic community was less affected. The response was highly species specific,
especially for the saprobic community. The difference in species composition between control and fertilized plots was significant
after 1 year of N addition for ectomycorrhizal fungi and only after 3 years for saprobic fungi. An aging effect affected sporocarp
production in the whole area. For both communities, this unidirectional drift in species composition was as important as the
treatment effect. This result highlights the importance of considering the respective role of treatment and year effects in
long-term field experiments on fungal communities. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|