For the purposes of this chapter, a "conservation easement" is an interest in real property created by deed, restrictions, covenants, or conditions, the purpose of which is to:
(1) Preserve and protect land predominantly in its natural, scenic, forested, or open-space condition;
(2) Preserve and protect the structural integrity and physical appearance of cultural landscapes, resources, and sites which perpetuate indigenous native Hawaiian culture;
(3) Preserve and protect historic properties as defined in section 6E-2, and traditional and family cemeteries; or
(4) Preserve and protect land for agricultural use.