Yes, your shed does need a base. This is to give it a solid, level foundation. Open soil will not help with the longevity of the shed itself or the contents within. The best materials to use to make your shed base are concrete, natural stone or wood.
Axminster
Axminster is a market town as well as civil parish on the eastern boundary of the region of Devon in England, some 28 miles (45 km) from the county town of Exeter. The town is improved a hillside forgeting the River Axe which heads towards the English Channel at Axmouth, and also is in the East Devon city government district. At the 2001 census, it had a population of 5,626, increasing to 5,761 at the 2011 census. The town consists of 2 selecting wards (community as well as rural) the overall amount of both wards being a population of 7,110. The market is still held every Thursday. Axminster gave its name to a sort of rug. An Axminster-type power impend is capable of weaving top quality rugs with lots of differing colours and also patterns. While Axminster carpets are made in the town by Axminster Carpets Ltd, this sort of carpeting is currently produced around the globe.