Fieldwork Flashcards
What was the sample size for our physical enquiry?
- 40 data points
- Over 200m
- Every 5m
What was the sampling method for our physical enquiry?
- Systematic sampling to collect gradient data
- Random systematic sampling to collect vegetation data
What equipment did we use for our physical enquiry?
- 50m tape measure
- Ranging poles
- Clinometer
- Quadrat
- Species identification sheet
What were risks of our physical enquiry?
- Ticks and snake bites (lyme disease and poison)
- Injury from slips, trips and falls
What did we do to mitigate ticks and snake bites during our physical enquiry?
- Tick checks done and removal devices carried
- Warned about dangers of adders, told to make noise
- Nearby hospital location known
What did we do to mitigate injury from slips, trips and falls during our physical enquiry?
- Site doesn’t have steep/unsafe inclines
- Wearing suitable footwear
- Students in groups with teacher supervision
What is the title of our physical enquiry?
To investigate changes to dune characteristics at Knoll Beach
What was the hypothesis of our physical enquiry?
There is a significant change to the shape and vegetation on the sand dunes
What is the analysis supporting the changing shape of sand dunes in our physical enquiry?
- There were dips between ridges but no wet slacks
- Decline in height at 84m
- Tourism led to footpaths, could be ‘slacks’ we identified
- Long dry summer, cause water table to have lowered
What is the conclusion that dune shape changed in our physical enquiry?
Can conclude confidently, data shows dune shape changes, there are multiple dune ridges, separated by lower areas of dry slack with a height range of 8m
What is the analysis supporting the increasing vegetation of sand dunes in our physical enquiry?
Vegetation increased rapidly:
- Increased from 0% to 100% within 40m, stayed high
- Sand dune succession theory, soil acidity, water retention, wind shelter and nutrient levels all increased along transect
- More likely vegetation can grow and survive
- 100% coverage interrupted by human impact
- Footpaths
What is the analysis supporting the vegetation species changing in the sand dunes in our physical enquiry?
Vegetation species changed but didn’t become more diverse:
- Marram grass dominant between 14-40m
- Heather until 150m
- Gorse until 200m
- Marram adapted, has deep roots and curled waxy leaves
- Heather needs better shelter/soil
- Cyril Driver Project shows National Trust overprotected heather
- pH samples of soil shows increased acidity by factor 2
- Influencing vegetation
What is the conclusion that dune vegetation changed in our physical enquiry?
Vegetation coverage increases, dominant species changes
What is the justification for choosing Knoll Beach for our physical enquiry?
- Large, 2km, deep and mature dunes, 1km deep, 200m transect
- Owned by National Trust, can access for free
- Conservation by National Trust, dunes in good condition
- Previous research done provides background to understand vegetation changes
- Popular tourist and local destination, can investigate impact of humans
- Only 15 minute drive from fieldwork base in Swanage
What is the dune succession theory?
How sand dunes form, sand blown inland, trapped and colonised by plants
- Small embryo and fore dunes, pioneer species, sandwort and marram grass
- Decomposition increases nutrient value and water retention
- Soil more acidic
- Yellow and grey dunes, heather and gorse
- Helps us interpret sand dune transects
What is the Cyril Driver Project?
Cyril Driver, local nature enthusiast, studied and mapped dunes over a century ago, documented species
- 2013, National Trust recreated study, dunes changed significantly
- New dune ridge, open areas of sand reduced from 30% to 2%
- Heather and gorse dominant
- Encourage visitors to trample and wander over dunes to regenerate them
- Helps us understand limited variety of species, heather dominating, high coverage of vegetation
What are plant adaptations in sand dunes and what can this tell us?
Plants in sand dunes have to adapt to difficult growing conditions, high wind speeds, extremes of temperature, alkaline pH, lack of water in soil
- We can understand why some plants grow at the front and others at the back
- Mobile dune fronts, marram grass, extensive root systems, curled and waxy leaves
- Fixed dunes, heather and gorse, more shelter from wind, nutrient rich and acidic soil
What do we need to consider when evaluating our physical enquiry?
- Reliability of method
- Impact on result accuracy
- Impact on conclusion validity
- How could we improve?
What made our usage of clinometers reliable?
- Used gradient data to calculate sand dune profile
- Double checked readings for accuracy
What made our usage of clinometers unreliable?
- Gravity led, takes time to settle
- Some rusted or sticky
- Open to human error
- Dune heights unlikely to fully match real value by 1-2 degrees when drawn