In order to further the purposes of article 57 of this chapter, the commissioner shall provide, within amounts appropriated from the environmental protection fund, state assistance payments for the preparation of the comprehensive central pine barrens land use plan pursuant to section 57-0121 of this chapter. State assistance payments may be made to the central pine barrens joint planning and policy commission established in article 57 of this chapter for all eligible costs incurred after April first, nineteen hundred ninety-three. No monies shall be expended for Long Island central pine barrens area planning except pursuant to an appropriation therefor.