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Extention of project HUMOR : Humic substances modifiers for the response of aquatic ecosystems to acidification

Objective

To investigate in detail the fate of acid rain in catchments with a high content in Humic Substances (HS) in soil and in soil water.

The "EXTENDED HUMOR" project will expand the scope of the ongoing "HUMOR" project, implemented in the STEP Programme (contract STEP-CT90-0112), mainly by elucidating to which extent Humic Substances (HS) are modifying the chemical and biological processes which are taking place during the passage of acid precipitation water through the soil in a catchment towards a lake.

The investigations will include:

- chemical characterization (including lipid and fatty acid composition) of acidified and non-acidified humic substances;
- determination of the effect of pH and HS on lipid solubility, microbial respiration and macroinvertebrate physiology;
- detailed characterisation of the hydrology, chemistry and biology of the land-water interface ("hydraulic vents").

The project will combine field with laboratory investigations. The field work will focus on the 6.5 ha catchment area of Lake Skervatjern, a 2.4 ha dystrophic lake located in Western Norway. This field site is also subject to the Norwegian/international project "HUMEX" (Humic Lake Acidification Experiment).

The experiments will contribute to a better understanding how HS are modifying the acidification processes in the terrestrial and aquatic compartments of catchments subject to air pollution loads.

Coordinator

UNIVERSITY OF BIRMINGHAM
Address
Edgbaston Park Road
B15 2TT Birmingham
United Kingdom

Participants (4)

CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS
Spain
Address
18-26,Jordi Girona 18-26
08034 Barcelona
Kungliga Tekniska Hogskolan
Sweden
Address

100 44 Stockholm
LUND UNIVERSITY
Sweden
Address
Ecology Building
223 62 Lund
NORWEGIAN INSTITUTE FOR WATER RESEARCH
Norway
Address
19,Brekkeveien 19
0411 Oslo