Usufruct is the legal right to use property that belongs to another person or entity. In many legal usufruct systems of property individuals or groups may only acquire the usufruct of the property, not legal land ownership.
You need to review the language in the instrument that created the easement to determine if the affected land can be used for other purposes. If you are the person to whom the easement was granted your use of the land encumbered by the easement is generally restricted to the use defined in the easement. If you granted the easement to another party the easement agreement may prohibit certain uses of the land encumbered by the easement.