为了改善生态环境,我国实施了退耕还林政策。退耕还林的关键在于造林树种的选择。为发展山区经济、改善生态环境获得双重效益,应遵循适地适树、乡土树种优先、经济效益与生态效益相统一、乔灌草相结合、为大自然中的动物提供生活栖息的场所的原则。 In order to improve the ecological environment, China has implemented the policy of returning farmland to forests. The key to returning farmland to forests lies in the choice of afforestation species. For the development of mountain economy, to improve the ecological environment to obtain double benefits, should follow the appropriate tree, native tree species priority, economic and ecological benefits of unification, the combination of arbors, shrubs and grasslands for the animals in nature to provide living habitat principle .