【摘要】 根据黄土高原和新疆干旱荒漠区退耕还林工程区的自然、经济和社会条件 ,在以县级单位为单元进行系统区划 ,建立了 4个大区 - 12个区 - 39个亚区 - 116个小区 4级区划体系的基础上 ,按照退耕还林生态经济社会效益紧密结合、可持续发展的基本原则 ,根据大量试验地观测结果和长期生产实践的科学分析 ,并参考大量前人研究成果 ,分别研究了各区的退耕还林模式 ,经过系统集成、创新提炼 ,形成了较为完整的退耕还林区域模式体系。共计 6个亚区 17个小区模式更多还原

【Abstract】 In this paper,based on setting up 4 grade divisions:4 major regions-12 regions-39 subregions-116 minor regions in the project area of return of farmland to afforestation in Loess plateau and Xinjiang desert area according to the principle of close combination of ecological,economical and social benefits and sustainable development,and on the basis of measurement results from test plots and productive practice,through system syntheses and refering the former study achievements,was formed a complete regional model system fit for the project of return of farmland to afforestation:6 subregions,17 minor regions in total.更多还原