章古台固沙林更新造林中天然更新的结合与利用

辽宁省章古台固沙林经过经营疏伐与块状采伐以后，通风透光条件改善，促进了天然下种更新。天然更新强度，在采伐迹地为690株·hm^-2，人工更新造林地为575株·hm^-2，油松和赤松林下松树为181株·hm^-2，其他树种295株·hm^-2。通过采取保护1年生樟子松幼树越冬，抚育油松、赤松幼树等措施，促进针叶树天然更新。在更新造林中，沙丘下部与丘间低地营造杨树，利用行间天然更新树木形成阔叶树混交林，沙丘中上部营造针叶树，利用行间天然更新灌木，形成乔灌混交林。

Combination & Utilization of Natural Regeneration of Regeneration Planting on Fixing Sand Forest in Zhanggutai Region

Natural seeding and regenernation were accelerated by thinning and massive cutting on fixing sand forest in Zhanggutai region in Liaoning province.Natural regeneration intensity on cut-over area is 690 trees·hm-2,and artificial regeneration planting ground 575 trees·hm-2,pine under Pinus tabulaeformis and Pinus densiflora 181 trees·hm-2,other species 295 trees·hm-2.Natural regeneration of coniferous trees was accelerated by taking measures,such as protection of overwintering of 1-year-old Pinus sylvestris var.mongolica sapling,tending of Pinus tabulaeformis and Pinus densiflora.Planting poplar below dune and on lowland,mixed forest of broadleaved trees were formed by natural regeneration in row middle.Planting coniferous tree species on middle-upper part of dune,mixed forest with trees and shrubs were formed by natural regeneration shrubs in row middle.