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在回顾三北防护林体系第一阶段建设的基础上,针对三北工程区脆弱的生态状况、多样的气候和土壤条件以及林业工程建设的限制因子,运用可持续发展、区域地理学、保护生物学等理论,系统地提出了四期规划的指导思想、建设内容、功能分区、管理等一系列工程建设的新思路。
On the basis of reviewing the construction of the first phase of the Three-North Shelterbelt Program, in light of the fragile ecological conditions, the diverse climatic and soil conditions and the limiting factors in the construction of the forestry project in the Three-North Project Area, the sustainable development, regional geography and conservation biology And other theories, put forward a series of new ideas of engineering construction such as the guiding ideology, construction content, functional zoning and management of the fourth phase of planning systematically.