【摘要】 对吉林省西部榆树疏林进行生长与更新调查和人工植苗更新试验,结果表明:大部分榆树疏林受到不同程度的人为干扰,依干扰程度分为重度干扰型、轻度干扰型和中度干扰型3种类型;中度干扰型又可分为两个亚型,即低密度单层榆树疏林亚型和低密度灌丛榆树疏林亚型。根据不同立地条件和干扰程度,确定3种榆树疏林恢复模式:平缓沙地榆树疏林、瘠薄沙丘单层榆树疏林和厚土层沙丘复层榆树疏林;并制订了4项相应的恢复技术,即:人工造林恢复技术,人工播种和人工辅助天然下种恢复技术,抚育恢复技术和管护恢复技术。更多还原

【Abstract】 Investigation on growth,natural regeneration and artificial regeneration were performed in west of Jilin province for elm sparse woods in 2009.The result showed that elm sparse woods were disturbed at various degrees by human activities.Elm sparse woods can be classified into 4 types according to the disturbance degree which were named as heavily disturbed,light disturbed,moderate disturbed(including 2 subtypes of monolayer elm sparse woods,and shrub elm sparse woods).Three restoration models were constructed,which were elm sparse woods on mild sand land,monolayer elm sparse woods on barren dune,stratified elm sparse woods on dune with thick soil.Based on the disturbance types and the models,4 restoration techniques were established,including plantation,seeding and natural seeding with human assists,management and protect technique.更多还原