The lands acquired by the state under Laws 1939, chapter 343, shall be subject to like trusts as the state lands involved in the actions for damages mentioned therein. The commissioner shall determine to what trusts the several tracts of land so acquired shall be subject according to their location, character, and value, making due allowance for the relative proportions of the different trusts to which the damaged lands were subject, and make and file a certificate thereof in the office having custody of the records of such lands in the department. The determination of the commissioner so certified shall be deemed conclusive as to the trust status of the lands affected unless thereafter changed by act of the legislature.