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Climate change experiment

Objective

To experimentally enrich with CO2 and raise the temperature at
two entire forested, headwater ecosystems, in order to quantify
the ecosystem impacts of future climate changes (increased
temperature and CO2) and to provide essential data for the
construction calibration and validation of process-oriented
models, which will be used to predict the response of forests and
freshwater in Europe to future changes in atmospheric CO2 and
climate.


CO2 and temperature will be experimentally increased at two
entire forested head-water catchment-ecosystems
utilising the
two enclosures (1200 m{2}) located at Risdalsheia, southernmost
Norway.
The existing facility for providing acidic and deacidified
rainwater will be augmented by increased levels of atmospheric
CO2 (to 560 ppm) and increased ambient air temperature (by
5º C)
by means of CO2 dosing and heating equipment conventionally
used in agricultural greenhouses. Catchment--scale unmanipulated
reference catchments will be established to provide detailed
information on natural variability between catchments. Further
controls will be established within the roofed areas to enable
assessment of the relative impacts of raised CO2 and
temperature
within the two acid deposition environments. The manipulation
will be implemented as a step change in CO2 and temperature at
the beginning of the growing season.

Quantification of ecosystem response will rely on monitoring and
measurements of key processes and compartments of the catchments.
Research will be focused on carbon dioxide utilisation by plants,
plant growth and nutrient status, soil/soil solution chemistry
and soil organic matter dynamics, measurements of productivity
and plant biomass turnover and quantification of the impact of
increased temperature and CO2 on the role of soil fauna in the
decomposition of litter.

Changes in fluxes of water and chemical species will be, finally,
evaluated over long time periods (years), seasons and storm
periods (days) at the manipulated and control catchments.
Process measurements of soil water status will be utilised to
identify the mechanisms controlling possible changes in
input-output budgets of water and ions, particulary nutrients.
New information from all sub-projects within CLIMEX will be
brought together to develop process - oriented models of whole
ecosystem behaviour.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

NATURAL ENVIRONMENT RESEARCH COUNCIL
Address
Maclean Building, Crowmarsh Gifford
OX10 8BB Wallingford
United Kingdom

Participants (6)

Dienst Landbouwkundig Onderzoek
Netherlands
Address

6700 AA Wageningen
Dienst Landbouwkundig Onderzoek
Netherlands
Address
92,Oosterweg
9750 RA Haren
Landbouwuniversiteit Wageningen
Netherlands
Address
10,Duivendaal
6701 AR Wageningen
NORWEGIAN INSTITUTE FOR WATER RESEARCH
Norway
Address
19,Brekkeveien 19
0411 Oslo
UNIVERSITAET BAYREUTH
Germany
Address
Universitätsstrasse 30
95440 Bayreuth
UNIVERSITY OF SHEFFIELD
United Kingdom
Address
Western Bank
S10 2TN Sheffield