为准确掌握内蒙古三北工程区退化林地分布情况,推进内蒙古三北工程建设,不断提升森林资源质量,持续改善内蒙古三北地区生态环境,2021年内蒙古自治区林业和草原局组织开展了三北工程区退化林摸底调查。成果显示,三北工程区退化林面积3 019 432.30hm²,退化乔、灌木林地各占16.86%和83.14%。退化原因主要有生理、立地、灾害和人为等原因,生理、灾害原因形成退化林面积分别占45.81%、38.13%。轻度、中度、重度退化面积分别占0.88%、64.86%、34.26%。退化林主要分布在内蒙古西部地区,需进一步采取更新、补造、抚育、封育、生境修复等措施进行修复,以保持区域生态建设成果。

In order to accurately grasp the distribution of degraded forest land in the Three-North Shelterbelt Project area of Inner Mongolia,promote the construction of the Three-North Shelterbelt Project,and continuously improve the quality of forest resources and the ecological environment in the Three-North Shelterbelt Project area of Inner Mongolia,Forestry and Grassland Bureau of Inner Mongolia Autonomous Region organized the survey of degraded forest land in the Three-North Shelterbelt Project area in 2021. The results showed that the area of degraded forest in the Three-North Project area was 3019432.30 hectares,of which 16.86% and 83.14% were degraded forest and degraded shrub land. The main reasons for forest degradation were physiology,site,disaster and human activities. The area of forest degradation caused by physiology and disaster accounted for 45.81% and 38.13% respectively. Mildly degraded,moderately degraded,and severely degraded areas accounted for 0.88%,64.86% and34.26 %,respectively. The degraded forests were mainly distributed in the western part of Inner Mongolia,and further measures such as renewal,restoration,tending,enclosure and habitat restoration should be taken to restore the degraded forests so as to maintain the achievements of regional ecological construction.