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“三北”是指东北、华北、西北三个地区。1977年农林部林业局工作组到西北各省区和山西省调查研究后,提出了营造三北防护林体系的规划意见。1978年5月在西安召开
“Three Norths” refers to the three northeast, north and northwest regions. After the work team of the Forestry Bureau of the Ministry of Agriculture and Forestry in 1977 went to investigate and study the provinces and autonomous regions in the northwest of China and Shanxi Province, they put forward the planning opinions on how to build the Sanbei shelterbelt system. May 1978 held in Xi’an