1. OPEN SPACE FUNCTIONS (from IUCN)
Regulation functions
Maintenance of biogeochemical cycling (e.g, air quality. CO2)
Climate regulation (e.g., buffering extremes)
Water regulation (flood protection)
Water supply (filtering and storage)
Soil retention (erosion control)
Soil formation & maintenance of fertility
Bio-energy function
Nutrient cycling (availability of nutrients)
Waste treatment(e.g., water purification)
Biological control (e.g., pest control and pollination)

2. OPEN SPACE FUNCTIONS (from IUCN)
Habitat functions: Providing refugia to wild plants & animals & indigenous populations to maintain genetic diversity
Refugium function( for resident & migratory species)
Nursery function (reproduction habitat for harvestable species)

3. OPEN SPACE FUNCTIONS (from IUCN)
Production Functions
Food (e.g., edible plants & animals)
Raw materials (e.g. thatch, fabrics)
Fuel and energy (renewable energy resources)
Fodder and fertilizer (e.g., krill, litter, etc.)
Medicinal resources (e.g., drugs, models, test organisms)
Genetic resources (e.g., for crop resistance)
Ornamental resources (e.g., aquarium fish, souvenirs)

4. OPEN SPACE FUNCTIONS (from IUCN)
Information Functions; Providing opportunities for reflection, spiritual enrichment & cognitive development
Aesthetic information (e.g, valued scenery)
Recreation and nature tourism
Cultural and artistic inspiration(i.e., nature as a motive & source of inspiration for human culture and art)
Spiritual and historic information (based on ethical considerations & heritage values)
Scientific educational information (i.e., nature as a natural field laboratory and reference area)

5. OPEN SPACE FUNCTIONS (from Fabos)
Biodiversity = habitat
Water quality & quantity
Recreation & tourism = economic activity
Structuring development
Historic & heritage values
Aesthetic & psychological well being