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.
Alva
Alva is a town in Clackmannanshire, embeded in the Central Lowlands of Scotland. It is one of a variety of towns located immediately to the south of the Ochil Hills, jointly described as the Hillfoots Villages or merely The Hillfoots. It is located between Tillicoultry and Menstrie. Alva had a resident population of 5,181 at the 2001 census yet this has because been modified to 4,960 in 2006. It flaunts many attributes such as a park with an occasion hall and a recently opened outside health club, and also is the house of Alva Academy. Alva was traditionally in an exclave of Stirlingshire, yet it was moved to Clackmannanshire in 1891.