东北西部内蒙东部是我国农田防护林营造历史最久、范围最广、规模最大的地区之一。到目前为止,造林保存面积达405万亩(据林业部1978年统计资料),其中接近一半已经郁闭成林,庇护农田面积达4500多万亩,几乎占全区总耕地面积的二分之一。经过多年的建设和科研活动,在理论和实践上积累了丰富的经验,对今后三北地区的防护林规划和建设都是 The eastern part of northeastern Inner Mongolia is one of the areas with the longest history, the widest range and the largest scale in China’s farmland shelterbelts. So far, the area for afforestation has reached 4.05 million mu (according to the statistics of the Ministry of Forestry in 1978), nearly half of which have been closed to forest. The area of ​​sheltered farmland has reached more than 45 million mu, accounting for almost half of the total cultivated land in the region one. After many years of construction and scientific research activities, we have accumulated rich experience in theory and practice, and both of the planning and construction of shelterbelts in the Three North Areas in the future are