Lichen litter decomposition in Nothofagus forest of northern Patagonia: biomass and chemical changes over time
Författare
Summary, in English
In northern Patagonia, macrolichens form species-rich and abundant epiphytic communities in southern beech forests. Five of the most abundant lichen species in the litter were selected in order to study mass loss rate and changes in mineral composition over time. The litter bag method was applied to the foliose lichens Pseudocyphellaria faveolata, Pseudocyphellaria flavicans, Nephroma antarcticum, Platismatia glauca and the fruticose Protousnea magellanica. Decomposition was measured over 550- and 600-day periods, starting in early and late summer, respectively. Mass loss after these periods varied from 30 to 82%. The decomposition rate between species differed from a half-life of 2.9 years in Pseudocyphellaria faveolata to 0.8 years in Protousnea magellanica and Plastismatia glauca. Samples deposited in early summer had a higher initial mass loss compared to samples deposited in late summer. After this initial loss, all species showed a similar temporal pattern with higher decomposition rates in winter and spring than in summer and fall. Pseudocyphellaria faveolata, Pseudocyphellaria flavicans and Nephroma antarcticum contain nitrogen-fixing cyanobacteria and had a considerably higher N concentration and lower C/N ratio than Platismatia glauca and Protousnea magellanica. However, the latter species had a faster mass loss. Changes in macronutrient concentrations were small apart from a rapid loss of P and K in Pseudocyphellaria spp. and increasing Ca and Mg concentrations in Platismatia glauca and Protousnea magellanica. We conclude that seasonal climatic variations partly control the decomposition pattern but that the time of litterfall strongly influences the initial decay rate.
Avdelning/ar
Publiceringsår
2007
Språk
Engelska
Sidor
266-273
Publikation/Tidskrift/Serie
Bryologist
Volym
110
Issue
2
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
AMER BRYOLOGICAL LICHENOLOGICAL SOCIETY INC
Ämne
- Ecology
Nyckelord
- Protousnea magellanica
- Pseudocyphellaria faveolata
- flavicans
- Pseudocyphellaria
- epiphytic macrolichens
- Argentina
- decomposition
- Nephroma antarcticum
- Platismatia glauca
- litter bag experiment
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1938-4378