Boswellia sacra (frankincense) (olibanum-tree), Sultanate of Oman

boswellia sacra frankincense olibanum tree harvesting resin oman arabian peninsula traditional practice cultural heritage nature landscape dry soil aromatic medicinal use native flora rural scene agriculture essential oil artisan skill cultivation care biodiversity sustainability ancient methods life environment organic ethnobotany forestry natural resources herbal remedies management ground cover ecosystem conservation