The ecological multi-layer structure model of economic forest and its application in hilly areas

The basic principle of the ecological multi-layer structure model of economic forest in hilly areas was reviewed in the paper. Multi layer structure cultivation models such as forest,fruit with grain crops,with economic crops,with vegetables,with medicinal plants,with forage crops and with edible mushroom which are suitable to be grown in the hilly areas in North China were summarized. The benefits of application of the models in hilly areas were also estimated.