Sand Dunes 5.0 / 5 based on 2 ratings ? GeographyCoastal environmentsASAQA Created by: Rachael_StevensCreated on: 28-02-16 16:01 What Are They? Accumulations of sand shaped into moulds by the winds. Sometimes found at the back of beaches on areas of low lying land Example: Southport Every Yellow Goose Dances Dangerously 1 of 8 Requirements A plentiful supply of sand Strong inland winds to transport sand particles through saltation An obstacle to trap the sand eg. seaweed, driftwood Plants - keeps the position of the sand 2 of 8 As You Moves Across The Sand Dunes... Organic matter/nutrient content gets higher Water retention gets higher Wind speeds decrease Soil acidity decreases 3 of 8 1. Embryo/Fore Dunes The pioneer plants are adapted to the conditions: Waxy leaves retain moisture Small leaves reduce transpiration Low lying to withstand wind Deep roots High salt tolerance Example: saltwort 4 of 8 2. Yellow Dunes Dominant species is marram grass: Salt tolerant Thrives on being buried in the sand Inrolled leaves reduce water lost Long tap roots Other example: ragwort 5 of 8 3. Grey Dunes Higher species diversity Mainly perennials Marram becomes more sparse Conditions improve Example: creeping willow 6 of 8 4. Dune Slacks Intercepts water table Marshy conditions Example: reeds 7 of 8 5. Dune Heath Woodland Climatic climax (natural) or plagioclimax (human interference) vegetations Diverse ecosystems Example: heather 8 of 8
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