中央领导同志号召西北地区种草种树的指示,是今后开发大西北农业自然资源的重要战略方针,是关系到该地区发展农、林、牧业和经济作物的关键性措施。尤其是在干旱和半干旱地区种树,不仅能开辟用材和薪柴的来源,更重要的是能起到防风固 The guidance of the central leading comrades in calling for the planting of trees and trees in the northwest region is an important strategic guideline for developing agricultural natural resources in the northwest in the future and is a key measure that affects the development of agriculture, forestry, animal husbandry and cash crops in the area. Species, especially in arid and semi-arid areas, not only open up sources of timber and firewood, but more importantly windbreak