Research on benefit evaluation index system of returning farmland to forest

Based on the evaluation index of the current forest engineering and combined with managerial demand of returning farmland to forest,the methods of Delphi,AHP,AHP-Delphi,assurance degree-gradient and maximum entropy-maximum variance were used.The benefit evaluation index system of returning farmland to forest could be evaluated quantitatively by selecting index system scientifically,determining weight,and utilizing expert knowledge base and measurement database.