为研究林线种群对气候变化的差异性响应方式,以长白山西坡林线为研究区,选择4个样地(220个样方)内牛皮杜鹃与小叶章为研究对象,以盖度和生长高度为指标,地形坡度为影响因素,对两种植物的扩张程度与动态对比进行分析,利用常规统计法分析牛皮杜鹃与小叶章向苔原扩张的态势,多种数学方程结合逐步剔除回归等方法分析两种植物在扩张时的相互关系。结果表明在气温上升的条件下,林线牛皮杜鹃与小叶章的盖度与生长高度都很大(盖度之和>79%),是林线上移的主力。在坡度较小(<5°)和较大(>42°)时,小叶章通过生长高度的优势排挤牛皮杜鹃成为唯一优势种,而在坡度12°~42°之间牛皮杜鹃又排斥小叶章成为占据这一坡度范围的主力。 In order to study the different responses of forestline population to climate change, taking the Xipo-Linlin line of Changbai Mountain as study area, four samples (220 quadrats) of Rhododendron simiarum and O. Height as an index and topographic gradient as the influencing factors, the expansion and dynamic contrast of two plants were analyzed. The general statistical method was used to analyze the expansion trend of Rhododendron odoratum and Trifolium pratense to the tundra. Many kinds of mathematical equations were combined with the regression analysis The relationship between the two plants when they are dilated. The results showed that under the conditions of rising temperature, the cover and growth height of Rhododendron simiarum and Betula alnoides were very high (> 79% of cover degree), which was the main force of up-shifting of forest line. When the slope was smaller (<5 °) and larger (> 42 °), the leaflet was predominantly dominated by growth superiority, and the rhododendron was the only dominant species at the slope of 12 ° -42 ° To occupy this slope of the main force.