NEW FOREST HEATHLAND SURVEY.
AIMS
This survey was concerned with looking at the changes in soil and vegetation on a transect located at Dead Mans Hill (See map A). The aim was to record the type and quantity of vegetation and to analyse the quality of soil on the transect. Using this information it would be possible to examine the relationship between the vegetation and soil, this would also give an indication to the condition of the heathland.
INTRODUCTION
Dead Mans Hill is located 30 miles south of Salisbury in the New Forest. The landscape is open with raised land in the distance covered by Oak, Scotch pine and Birch trees. The main vegetation immediately visible was heather, gorse and bracken, all characteristic of heathland. The Bracken was beginning to die off, the Gorse still had a few yellow flowers and the Heather showed no signs of grazing. The location of the transect was on a gentle slope. At the bottom of the slope the land was wet and boggy; here the vegetation was mainly grass, rushes and sedges. Surface water was visible which had a brown /orange colour. The only wildlife visible was New Forest ponies, which roam freely over the forest. Signs of a rabbit population were also visible.
Heathland is only found in temperate climates in Western Europe below an altitude of 300m and is an important habitat for animals such as the Nightjar, Stone-curlew, Dartford Warblour and Smooth Snake. Heathland is not a natural landscape; there is evidence of it being present as far back as the Bronze Age. Earthworks such as barrows and other structures were sited on the heath so as to be seen from a distance; the soils beneath these earthworks contain podzols, which only form where ling is present on heathland. Two such podzols in the Breckland were dated to 900BC.
To conserve heathland it has to be managed, if it isn’t managed it will eventually revert back to woodland; this process is known as succession. Over the past 200 years 9/10ths of European heathland has been lost, as a result the New Forest heathland is now the largest in Europe.
The vegetation that grows on the heath used to be harvested at regular periods, Ling was used as fuel and thatch, Bracken was also used as fuel and to produce potash used in glassmaking. Grazing of animals used to be more common on heathland, all these factors helped manage the heath. The land use has now changed, grazing of animals isn’t common and the population of rabbits was reduced by Myxomatosis, as a result Bracken, Heather and Grasses have taken over the heath replacing the short and varied vegetation that used to be present 11. Heathland has also been fragmented by roads and building, this produces lots of boundaries from which the woodland begins to encroach, once this happens it is very difficult to reverse, for example Hampstead Heath in London. Heathlands are usually located on sandy soil, this soil has very good drainage and as a result nutrients are washed away leaving a nutrient poor soil. This soil is also usually acidic having a pH 3.5-6.5, where water gathers the pH tends to be higher making the soil even less fertile. As a result Heathlands tend to be exposed areas, with nutrient poor soil which can only sustain small plants.