46 may be withheld, reduced, cancelled, or forfeited by order of the President. Ten percent (10%) of the shares of the internal revenue taxes of the Regional Government and of the provinces, cities, municipalities, and barangay of the autonomous region and all allocations for the development of the autonomous region by the central government or national government shall be devoted to reforestation projects and other environmental activities to enhance the protection and development of the environment in the autonomous region. The Regional Government shall require corporations, companies, and other entities within the ancestral domain of the indigenous cultural communities whose operations adversely affect the ecological balance to take the necessary preventive measures and safeguards to restore, enhance, and maintain such a balance. SEC. 6. Unless authorized by the Regional Assembly, lands of the ancestral domain titled to or owned by an indigenous cultural community shall not be disposed of to non-members. SEC. 7. No portion of the ancestral domain shall be open to resettlement by non-members of the indigenous cultural communities. SEC. 8. Regional Land Reform. – Subject to the provisions of the Constitution, the Regional Assembly may enact an agrarian reform law suitable to the special circumstances prevailing in the autonomous region. ARTICLE XI Urban and Rural Planning and Development SECTION 1. Urban and Rural Development. – The Regional Government shall promote and formulate comprehensive and integrated regional urban and rural development policies, plans, programs, and projects responsive to the needs, aspirations, and values of the people in the autonomous region.