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通过１０ａ的定位观测，研究了长白山地区针阔混交林结构的动态变化。树种及其分布基本保持不变。林分密度从４０４株／ｈｍ２降至３８７株／ｈｍ２，而基础面积从４４．８３ｈｍ２降至４３．７９ｈｍ２。除色木槭之外，冠层林木的株数降低。优势树种的更新状况不佳。死亡与更新的关系表现在群落中植物组成的变化上。当红松开始衰退时，落叶树种的优势明显上升。几种阔叶树的胸径分配与个体的大小相关。不同的胸径等级上的最大增长率与树木本身大小呈负相关。增加的胸径及其向下一个等级发展的趋势，暗示了冠层压迫对高生长的影响。在成熟林的斑块内，树种不断地发生变化，而且斑块内具有一定的循环周期：林冠空隙→树木生长→树木成熟→林冠空隙。上层林冠的树种中除色木槭外，都趋向于减少种群数量。并且两种不同的更新方式和分布范围揭示了树种更新的间断性。在群落的衰退阶段，树种的交替受优势树种变化的影响。
The dynamic changes of the structure of coniferous and broad-leaved mixed forests in Changbai Mountain were studied through the orientation observation of 10a. Tree species and their distribution remain unchanged. Stand density decreased from 404 plants / hm2 to 387 plants / hm2, while the basal area decreased from 44.83 hm2 to 43.79 hm2. In addition to color maple, canopy trees reduced the number of trees. The status of the dominant species is not updated well. The relationship between death and renewal is reflected in changes in plant composition in the community. When the Korean pine began to decline, the deciduous tree species increased significantly. The DBH distribution of several broad-leaved trees is related to individual size. The maximum rate of growth at different DBH levels is inversely related to the size of the trees themselves. The increased DBH and its downward trend indicate the impact of canopy compression on high growth. Within mature plaques, tree species are constantly changing and have some cycles within the plaque: canopy gap → tree growth → tree maturity → canopy space. In addition to the color canopy maple tree species in the upper canopy, tend to reduce the population. And two different ways of updating and distribution revealed the discontinuity of species updating. In the declining stage of the community, the alternation of tree species is affected by the change of dominant tree species.