Ecosystem Support Systems

Caitlyn Grayston
Note by Caitlyn Grayston, updated more than 1 year ago
Caitlyn Grayston
Created by Caitlyn Grayston about 4 years ago
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A-Level Geography (A Level Biodiversity Under Threat) Note on Ecosystem Support Systems, created by Caitlyn Grayston on 06/01/2017.

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Ecosystems are identified by their dominant vegetation cover. They provide different life support systems.Green Lungs: Forests remove CO2 from the atmosphere. This reduces global warming Forests give out oxygen - purifying the atmosphere More than 20% of the worlds oxygen is produced in the Amazon rainforests Deforestation is responsible for 18-25% of global CO2 emissions Nutrient Cycling: Forests provide leaf litter which forms humus. This makes the soil more fertile for growing crops Roots hold soil in place to stop nutrients being washed away Hydrological Cycle: Forests protect watersheds from soil erosion and intercept precipitation preventing flash flooding By trapping silt forests keep water pure Reefs and mangroves provide protection from coastal storms

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