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.
Isle Of Scalpay
Scalpay is an island in the Outer Hebrides of Scotland. Scalpay is around 4 kilometres (2.5 miles) long and also rises to an elevation of 104 metres (341 feet) at Beinn Scorabhaig. The area of Scalpay is 653 hectares (2.52 sq mi). The major settlement on the island goes to the north, near the bridge, gathered around An Acairseid a Tuath (North Harbour). The island is peppered with little lochans. The biggest of these is Loch an Duin (Loch of the Ft) which has a small island in it, with the remains of the ft still visible. Eilean Glas, a little peninsula on Scalpay's eastern shore, is residence to the first lighthouse to be integrated in the Outer Hebrides. Scalpay's nearby neighbor, Harris, is simply 300 metres (980 feet) away across the narrows of Caolas Scalpaigh. In 1997, a bridge from Harris to Scalpay was constructed, changing a ferry solution. In 2001, the island had 322 people, whose major employment was fish farming as well as prawn fishing. By 2011 the population had actually declined by 9% to 291 whilst during the exact same period Scottish island populations in its entirety expanded by 4% to 103,702.