Terrestrial Ecosystem Model Group
|Figure: An overview of our model studies
of CO2 exchange between the atmosphere and
This group is working on modeling of carbon dioxide (CO2) exchange
between terrestrial ecosystems (e.g., forest and grassland) and the
atmosphere, to simulate the responses to global environmental change.
This issue is important, because terrestrial CO2 exchange should affect
the global warming in the future, as the Kyoto Protocol takes net
CO2 uptake by forests into account. The carbon cycle model we are
developing is a simple box-flow model, in which photosynthetic CO2
uptake and respiratory CO2 release are simulated in a mechanistic
manner. The model estimation of CO2 exchange has been validated by
comparing with observational data at several sites, which were obtained
by micrometeorological methods. To apply the model to various sites,
we are actively participating in several projects and collaborating
with external research groups. On the other hand, the model is used
to estimate vegetation productivity and ecosystem.
|Figure: A virtual forest model, which
explicitly represent three-dimensional forest architecture. This model
will clarify relationships between physiological processes and vegetation
dynamics at forest stand level.
The purpose of this subgroup (Ecosystem Architecture Model) is to
forecast long-term changes in forest ecosystems, which form the largest
terrestrial organic carbon pool, in response to climate and environment
change, through modeling ecological processes at various scales paying
attention to three-dimensional ecosystem architecture. To predict
long-term dynamics of forest systems, this subgroup intends to fill
the gap between physiological processes and tree population processes
applying individual-tree-based model, and extending stand-based simulators
to geographic scale to predict forest-zone response to climatic change.