A1.1 Forest growth dynamics and climate history - Dendroecological reconstruction and climate modelling
[funded by BR1895/13-1]
PI(s) for this project:
Prof. Dr. Achim Bräuning
Dendroecological reconstruction and modelling of climate and forest growth variability
in the surrounding of Loja in southern Ecuador during historic times.
Seasonal tree-growth dynamics and wood formation shall be studied with the help of
high-resolution dendrometer measurements and quantitative analysis of wood
microcores collected in monthly intervals. In contrast to investigations carried out
during the previous project, the proposed study shall be conducted along a climatic
gradient in southern Ecuador including humid mountain rainforests and dry deciduous
forests. Based on the derived climate-growth relationships, local climate
reconstructions using long increment cores from different tree species shall be
developed from ring width measurements and analyses of stable carbon and oxygen
isotopes in the wood cellulose. These tree-ring data will be calibrated with spatial fields
of certain climate parameters derived from NCEP/NCAR data by using the MM5 model.
From these calibrations a climate-growth model named CLIVATREC shall be
developed that relates variations in tree-ring data to regional variations of climate
parameters. This model is used to reconstruct areal changes of climate variability
during the past ca. 300 years and potential tree growth reactions on future climate
developments. A close comparison to vegetation history derived from pollen analysis
will be carried out. On the plot level, forest dynamics and tree reaction to management
measures shall be deepened by analysing the growth reactions to controlled tree
fellings that were conducted in the forest of the RBSF.