Discussion on the key factors affecting the occurrence and growth of populus root sucker in Bashang area of Zhangjiakou
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 1.0～1.5cm or more would be more applied to the regeneration of root turion seedlings.
populusroot suckerditching to promote sproutingstand densityBashang area of Zhangjiakou
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