The provisions of this title shall be severable, and if any clause, sentence, paragraph, subdivision or part of this title shall be adjudged by any court of competent jurisdiction to be invalid, such judgment shall not affect, impair or invalidate the remainder thereof, but shall be confined in its operation to the clause, sentence, paragraph, subdivision or part thereof directly involved in the controversy in which such judgment shall have been rendered; provided that if a conservation easement created pursuant to this title is determined by any court of competent jurisdiction to be land or water or an interest in land or water subject to the provisions of article fourteen of the constitution then the authority of the state to hold or acquire such easement and the conveyance to the state of such easement shall be void ab initio.