为了防风固沙、保持水土、保障农田稳产高产和生产供应木材与各种林产品,以适应国民经济的需要,造林事业正在全国范围内蓬蓬勃勃地发展。由于造林是一项比较长期性的生产建设,要几年、几十年才能见到成效。同时, In order to prevent wind and sand from sticking to the soil and water, to ensure stable and high-yield farmland and to supply and supply wood and various forest products to meet the needs of the national economy, the afforestation project is developing vigorous nationwide. As afforestation is a relatively long-term production and construction, it will take years and tens of years to see results. Simultaneously,