Eco-environment contribution of agroforestry to agriculture development in the plain area of China—Huai''''an Prefecture, Jiangsu Province as the case study area
1. Research Center for Eco-Environmental Sciences,Chinese Academy of Science,Beijing 100085,China. 2. Academy of Forest Inventory and Planning,State Forestry Administration,Beijing 100714,China; 3. China National Forestry Economics and Development Research Center,Beijing 100714,China