张家口坝上地区影响杨树根蘖苗发生和生长的关键因素探讨  

Discussion on the key factors affecting the occurrence and growth of populus root sucker in Bashang area of Zhangjiakou

作　　者：黄河 李雪峰 王学勇 徐振华 李向军 刘春鹏 HUANG He;LI Xuefeng;WANG Xueyong;XU Zhenhua;LI Xiangjun;LIU Chunpeng(State-owned Forest Region Management Center of Zhangbei county,Zhangjiakou,Hebei 076400,China;Zhuolu Country Forestry and Grassland Bureau,Zhuolu,Hebei 075600,China;Hebei Academy of Forestry and Grassland Science/Hebei Technical Innovation Center for Forest Improved Variety,Shijiazhuang,Hebei 050061,China;Fengning National Long-term Observation and Research Station for Sandy Land Ecosystem of Hebei,Fengning,Hebei 068357,China)

机构地区：[1]张北县国有林区管理中心,河北张家口076400 [2]涿鹿县林业和草原局,河北涿鹿075600 [3]河北省林业和草原科学研究院/河北省林木良种技术创新中心,河北石家庄050061 [4]河北丰宁沙地生态系统国家定位观测研究站,河北丰宁068357

出　　处：《河北林业科技》2024年第2期16-20,共5页Journal of Hebei Forestry Science and Technology

基　　金：中央财政林业和草原科技推广示范项目“坝上生态公益林树种更新及修复关键技术示范与推广”(冀TG[2023]008)。

摘　　要：以河北省张家口坝上地区退化杨树林为研究对象,采用林地开沟促萌的方法,探讨了距母树行距离、林分密度以及萌蘖根粗度对根蘖苗发生和生长的影响。结果显示:(1)距母树行距离显著影响根蘖苗的发生和生长。当距母树行距离超过6 m时,将不会有根蘖苗的发生。而当距母树行距离在6 m以下时,随着距母树行距离的增大,根蘖苗的发生以及高径生长呈现出下降的趋势。在距母树行距离2~3 m处开沟促萌对于杨树根蘖苗更新是较为适宜的;(2)随着林分密度的降低,根蘖苗的发生数量显著降低,但根蘖苗的高、径生长却显著增大。低密度林分内发生的根蘖苗的数量和生长情况,完全能满足退化杨树林分的更新所需;(3)随着萌蘖根粗度的增大,发生在其上的根蘖苗的数量和生长状况均显著增加。综合分析认为:对于张家口坝上地区退化杨树林而言,发生于粗度1.0~1.5 cm以上的根蘖苗更适宜用于萌蘖更新。In order to provide a theoretical reference for the regeneration of rootsucker in degraded populus forest,the degraded populus forest was taken as the research object in Bashang area of Zhangjiakou,Hebei province,the method of ditching to promote sprouting in forest land was adopted,the effects of distance from mother tree row,stand density and sprout root diameter on the occurrence and growth of root seedlings were discussed.The results showed:(1)The distance from the mother tree row significantly affected the occurrence and growth of root seedlings.When the distance from the mother tree line was more than 6 m,there would be no root seedlings.When the distance from the mother tree was less than 6 m,with the increase of the distance from the mother tree,the occurrence and height and diameter growth of root seedlings showed a downward trend.Ditching at a distance of 2~3 m from the mother tree row was more suitable for the regeneration of populus root sucker.(2)With the decrease of stand density,the occurrence number of root seedlings decreased significantly,but the height and diameter growth of rootseedlings increased significantly.The occurrence number and growth of root seedlings in low-density stands could fully meet the needs of regeneration of degraded populus stands.(3)With the increase of root diameter,the number and growth of root seedlings increased significantly.For the degraded populus forest in the Bashang area of Zhangjiakou,the root seedlings with a root diameter of 1.0~1.5 cm or more would be more applied to the regeneration of root turion seedlings.

关 键 词：杨树 根蘖苗 开沟促萌 林分密度 张家口坝上地区 

分 类 号：S792.11[农业科学—林木遗传育种]