Lectures - Coastal dunes
22 important questions on Lectures - Coastal dunes
What key factors controll the dune vegetation?
● Elevation
● Beach width
Sedimentation dynamics
● Beach width
● Topographic shelter
Negative plant-soil feedback
What type of process is dune building?
- Rate of sedimentation exceeds rate of erosion
- Vegetation increases sedimentation and decreases erosion
What habitat types are present in dunes?
2. Embryonic shifting dunes
3. Shifting dunes (white dunes)
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Why is the beach "plant-hell"?
- Below mean high tide line
- 2x per 24hrs submerged by sea water
- Extreme fluctuations in environment
- Temperature, moisture, salinity
- Low in plant nutrients (N, P)
- Sand movement = mechanical stress
What species survive?
By what is the lowest position of embryo dunes determined?
Why does Ammophili need fresh sand for optimal growth?
◼ Escape microorganisms feeding on roots
What species are typical for the beach?
What species are typical for embryonic shifting dunes?
What species is typical for shifting dunes (whites dunes)?
What is different for the beach and shifting coastal dunes in comparison to fixed coastal dunes?
- The origin of the sand
- Exposition
- Rabbits
What is the origin of the sand from the Holland coast?
• High calcium content
• Rich in shells
What is the origin of the sand at the Zeeland coast?
• Intermediate calcium
What habitats are found in fixed dunes?
a. Pioneer calcareous
b. Calcareous
c. Acidic
2. Hippophae dune scrub
3. Wooded dunes
4. Humid dune slacks
What identifies calcareous, pioneer dune grasslands?
What identifies acidic grasslands?
What identifies calcareous dune slacks?
What identifies acidic dune slacks?
What species are typical for Hippophae scrubs?
What species is typical for wooded dunes?
What species is typical for calcareous humid dune slacks?
What species is typical for acidic humid dune slacks?
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