张家口坝上地区是京津冀防护林建设的重点区域,防护林建设初见成效。近年来,现有防护林中的杨树防护林出现了林分树龄老化、防护功能退化等问题。本文从该地区杨树退化防护林的退化现状、退化原因、改造方式和政策建议等4个方面进行了阐述,旨在为该地区防护林后期建设提供参考。
Preliminary results of protection forest construction were achieved in Bashang district of Zhangjiakou city and this area is regarded as key section of Beijing-Tianjing-Hebei shelter forest planning.In recent years,some problems have appeared in poplar protection forest,for example,old-aged forest and degenerated functions.In the paper,four aspects including degenerated poplar protection forest situation,degeneration reason,transformation measure and countermeasure are discussed in order to provide reference for follow-up protection forest construction.
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