In conclusion to my investigation, I can answer my title Howthe Sand dune environment of Studland changes progressively away from the seawith 4 supported and proved points, these are as follows.
Firstly, at Studland, the water content increasesprogressively away from the sea, as nearer the sea the ground has little humuscontent meaning the ground is mostly sand. This lack of humus means that theground is unable to retain much water meaning that there is little moisturewithin the ground, however, as you retreat further away from the sea the humuscontent increases within the ground meaning it is made mostly of nutrient richsoil that can retain water and therefore moisture within the ground. As thehumus gradually increases away from the sea then I predict that the moisturewill also gradually increase away from the sea.
Secondly, in the sand dune environment presented atStudland, the pH level of the soil progressively decreases away from the sea becauseof salt content. Near the sea the ground has a very high salt content due tothe saline waters. Salt is blown up the beach by the wind and integrated withinthe ground. The water increases the grounds alkalinity because the pH of thesea is around an average of 8.1, making it slightly alkaline, this is thenabsorbed into the ground, increasing pH of the ground. As you travel away fromthe sea the salinity decreases, due to the lack of sea water nearby andtherefore so does alkalinity. Thirdly, at the sand dune environment of Studland, the percentageof vegetation cover increases progressively away from the sea because of theamount of plant species that can survive in difficult environments, forexample, there are few species that can survive near the sea edge where thereis little or no humus content, that supplies vital minerals and nutrientsneeded for many plants to grow and thrive.
Species such as marram grass cansurvive in such environments because of their long roots that allow them to findwater deep in the ground and help them to anchor to the weak sand ground.However, further away from the sea humus content increases and so doesnutrients needed for most plants therefore meaning more species, such asheather and gorse, can grow in the sand dune environment, this means that asyou move up the beach away from the sea and into the dunes vegetation coverwill increase.Lastly, at Studland, the height of the dunes progressivelyincreases away from the sea because of the formation of different dune types.These include embryo dunes, yellow dunes, grey dunes and mature dunes. Embryodunes are the smallest type, this is because this is where the dunes begin toform, they are small because there is no soil to hold them in place, there is only species such as marram grass whichacts as a trap for sand and supports it slightly, whereas yellow dunes areslightly taller and larger, this is because of increases soil stability, thereis more shelter and less salt carried by the wind meaning that soil quality isbetter, increasing plants to anchor the dune and less wind to blow the sandaway that could destroy the dune. Grey dunes are the very last dunes. They havea very high proportion of organic material and darker, richer soils account forthe name grey dunes.
Here shrubs start to grow. This means the dune is verysheltered and well supported. The many plants and shrubs help the dune to growhigher as they help to collect and support soil.All my points that help me to come to this conclusion about the sanddune environment of Studland and how it changes have been proved during theanalysis of my results. This assures me that I have answered this statement asaccurately as possible using the data I collected.