长白山温带针阔混交林结构与动态的研究(英文)

STRUCTURE AND DYNAMICS OF A TEMPERATE DECIDU OUS CONIFER MIXED FOREST IN CHANGBAI MOUNTAIN *

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 changes in structure of a deciduous conifer mixed forest in Changbai Mountain,northeast China,were investigated in a permanent plot with a 10 year interval.Species and size distribution remanined almost no changes.Stand density was reduced from 404 to 387 stem/hm 2,and basal area from 44 83 to 43 79 hm 2.All species in high canopy layer except Acer mono decreased in number of stems.The regeneration of the dominant species was poorly represented.The death recruitment relationship showed that the community was changing in composition.The dominance of deciduous components tended increasing while Pinus koraiensis was declining.The stand is considered a patch in its matured phase,and species change was in proceeding.