Terrestrial Ecosystems (Case Study: South Downs) (AQA A-Level Geography): Flashcards
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Ecosystem definition
Ecosystem definition
Living organisms + physical environment interacting as one unit
Three nutrient stores in an ecosystem
Three nutrient stores in an ecosystem
Soil, Litter, Biomass
Biomass (nutrient store)
Biomass (nutrient store)
Total mass of all living plant & animal material in ecosystem
Leaching
Leaching
Water carrying dissolved nutrients down through soil layers
South Downs length & location
South Downs length & location
~100 km chalk ridge from Winchester to Beachy Head
South Downs annual rainfall
South Downs annual rainfall
Approx. 950 mm per year
Rendizina soil
Rendizina soil
Thin, well-drained, Ca-rich but nutrient-poor soil over chalk
Max plant species per m² in chalk grassland
Max plant species per m² in chalk grassland
Up to 56 different plant species
SSSI (Sites of Special Scientific Interest)
SSSI (Sites of Special Scientific Interest)
UK areas legally protected for important wildlife/geological features
Habitat fragmentation effects
Habitat fragmentation effects
Increased extinction risk, edge effects, restricted species movement