Moisture in and of itself will not necessarily cause wood to rot. If this was the case, there would not be any submerged logs, the remains of any shipwrecks underwater or wooden houses left standing.
While moisture is a contributing factor, there are others as well. Think about a towel, you can use it multiple times if you hang it up properly and let it dry. Use it once and ball it up on the floor and see what happens. Sunlight, wind, eliminating ground contact and proper air circulation will go a long way towards preventing your wood from rotting.