CERZOS   05458
CENTRO DE RECURSOS NATURALES RENOVABLES DE LA ZONA SEMIARIDA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Biological, mechanical and chemical litter effects on establishment of plant communities
Autor/es:
ALEJANDRO LOYDI
Lugar:
Hamburgo
Reunión:
Encuentro; Network Meeting of the Alexander von Humboldt Foundation; 2011
Institución organizadora:
Alexander von Humboldt Stiftung
Resumen:
Litter plays
an important role in community organization and their effects depend on litter
type, litter amount and environmental conditions. Generally, the effects of
litter in forest ecosystems are negative, while in grasslands ranges from
strongly negative to slightly positive, depending on the presence of
competition and litter origin. In recent years many papers have been published
that deal with this subject, but still there is little available information
about the role of competition in seedling establishment in grassland
ecosystems, and its interaction with litter amounts and litter types. Also, the
mechanisms behind this ecologically relevant differential litter effects are
not yet fully understood. This research project proposes two experiments and
one meta-analysis. The first experiment will test the effects of litter types
and amounts, and its interaction with competition, on the emergence of seedling
from grasslands and woodlands. The second is a greenhouse experiment that will
test mechanical and chemicals effects of litter on vegetation from woodland and
grasslands. Finally, a meta-analysis will be made, to combine information of
litter effects from grassland ecosystems worldwide; expecting to synthesize the
information generated in recent years to seek for general patterns in the
response of vegetation to litter in grasslands. In Argentina the Pampas Grasslands
are one of the most endangered ecosystems. These areas are threatened by the
development of agriculture and animal husbandry, and also by the advance of
introduced plant species (e.g Pinus
spp., Spartium spp., Genista spp.). Several restoration projects
are developing in the area, where introduced species are removed and native
species seeds are transferred. Dead plant biomass (i.e. litter and timber) is
not always removed due to topographic impediments, affecting restoration goals.
Thereby information about the effects of litter is increasingly important to
succeed in restoration efforts. Research collaboration with the Institute of
Landscape Ecology and Resource Management at Justus-Liebig University in Giessen
will allow me to get contact with similar restoration projects that are taking
place in the Upper Rhine and the possibility to transfer their knowledge and
experience to Argentina.