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THE IMPACT OF FORESTS AND SILVICULTURAL PRACTICES UPON THE EXTREME FLOWS OF RIVERS

Objective



Background :
It is recognised that forests tend to evaporate more water than shorter vegetation. In wet climates this may be explained by the increased losses of rainfall intercepted on the vegetative surfaces of trees. In dry climates forests, because they generally have deeper roots and are more able to access soil water during drought periods, also tend to evaporate more water than shorter vegetation. It would be expected, therefore, that forests have a negative influence on the sustainability of dry season flows from catchments, and combined with the higher infiltration of forest soils have a positive influence on reducing flood flows. However, reality indicates that more complex factors influence the water debit from forest regions.

The objective is : to quantify the effects of forestry (broadleaf and conifer) on flow
extremes - both dry weather flows and peak flood flows.

Short description of the project :

The project will determine the effects of forestry on extreme flows in relation to different tree species (Sitka spruce, Ash, Lodgepole pine, Eucalyptus, Maritime pine, spruce, beech and may be oak), stand age and silvicultural practices. The programme of work includes:
- analysis of existing long-term catchment records,
- detection of effects on streamflow of felling, coppicing or planting
- measurement of plot parameters such as transpiration, interception losses, soil
water, soil moisture, meteorological variables,
- production of a general model.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

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

Participants (7)

BAVARIAN STATE INSTITUTE FOR FORESTRY
Germany
Address
Hohenbachernstraße, 20
85354 Freising
FORESTRY COMMISSION RESEARCH AGENCY
United Kingdom
Address
Alice Holt Lodge, Wrecclesham
Farnham
HESSISCHE LANDESANSTALT FÜR FORSTEINRICHTUNG
Germany
Address
Prof. Olkers Straße, 6
34346 Hann. Muenden
THE IRISH FORESTRY BOARD - COILLTE TEORANTA
Ireland
Address
Sidmonton Place, 1 - 3
Bray Co Wicklow
UNIVERSIDADE TECNICA DE LISBOA
Portugal
Address
Tapada Da Ajuda
1399 Lisboa
UNIVERSITE D'AVIGNON ET DES PAYS DE VAUCLUSE
France
Address
Rue Louis Pasteur, 33
84000 Avignon
UNIVERSITY COLLEGE CORK
Ireland
Address
Western Road
Galway