Visual values
Urban woods. Tree mass generally more important than individuals Savanna and street trees. Tree mass and individual size and form important. Trees in paving. Individual trees most important. Tree numbers and size usually less than desired.
|
Urban tree effects on microclimate
Urban woods. Forest stand microclimate, depending on area and density. Moderated temperatures, reduced winds, and higher relative humidity (mostly +) Savanna and street trees. Shading (±), reduced windspeed (±), some increased relative humidity (±). Trees in paving. Shading surfaces (mostly+), reduced windspeed, possible turbulence (±).
|
Tree effects on urban mesoclimate
Urban woods. Can be significant depending of area coverage. Savanna and street trees. Can be significant in total. Trees in paving. Probably minor effect in most cases.
|
Air quality values
Urban woods. Can be significant pollutant trap and sink. Savanna and street trees. Pollutant trap role depends on canopy mass (±). Sink function depends of greenspace area and conditions. Trees in paving. Pollutant trapping very limited (±). Sink is largely storm runoff and streetcleaning rather than greenspace.
|
Watershed values
Urban woods. High interception and evapo-transpiration depending on canopy cover. High infiltration depending on soils and surface. Savanna and street trees. Interception and evapotranspiration depends on canopy cover, Infiltration and storage usually reduced. Trees in paving. Interception, evapo-transpiration, infiltration and storage all usually very limited.
|