长白山次生杨桦林树木短期死亡动态  

Short-term death dynamics of trees in natural secondary poplar-birch forest in Changbai Mountains of Northeast China

作　　者：张昭臣[1,2] 郝占庆[1] 叶吉[1] 蔺菲[1,2] 原作强[1] 邢丁亮[1,2] 师帅[1,2] 王绪高[1] 

机构地区：[1]中国科学院沈阳应用生态研究所森林与土壤生态国家重点试验室,沈阳110164 [2]中国科学院大学,北京100049

出　　处：《应用生态学报》2013年第2期303-310,共8页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重要方向性项目(KZCX2-YW-QN402);国家自然科学基金项目(40971286;41101188;31100447)资助

摘　　要：以长白山次生杨桦林5hm2样地为对象,以2005和2010年两次调查数据为基础资料,分析了2005—2010年间样地主要树种的组成、数量,死亡个体的径级分布,以及不同生境类型下主要树种的更新特征.结果表明:研究期间,样地内树木胸径(DBH)≥1cm的独立个体的树种数由46种增至47种,新增3个树种,2个树种因仅有的一个个体死亡而消失;独立个体数由16509株减少为15027株,其中,死亡个体数2150株,占2005年个体总数的13%,新增个体数668株,净减少1482个个体;样地树木的胸高断面积由28.79m2·m-2增至30.55m2·m-2,有41个树种的胸高断面积增加,6个树种减少,其中,山杨和白桦的减少量占总减少量的72.3%;小径级个体的死亡量较大,DBH<5cm个体的死亡量占总死亡量的65%,山杨和白桦是大径级个体死亡的主要树种.不同生境类型下个体死亡率差别不大,但各径级间的树木死亡率则有较大差异.Taking the 5 hm2 sampling plot in the natural secondary poplar-birch forest in Changbai Mountains as test object,and based on the two census data in 2005 and 2010,an analysis was made on the main tree species composition and quantity,size class distribution of dead individuals,and regeneration characteristics of the main tree species in different habitat types of the plot in 2005-2010.In the five years,the species number of the individuals with DBH≥1 cm increased from 46 to 47,among which,3 species were newly appeared,and 2 species were disappeared.The number of the individuals changed from 16509 to 15027,among which,2150 individuals died,accounting for 13% of the whole individuals in 2005,and 668 individuals were newly increased.The basal area of the trees increased from 28.79 m2·m-2 to 30.55 m2·m-2,with that of 41 species increased while that of 6 species decreased.The decrease of the basal area of Betula platyphylla and Populus davidiana accounted for 72.3% of the total decrease.Small individuals had higher mortality,as compared with large ones,and the mortality of the individuals with DBH5 cm occupied 65% of the total.B.platyphylla and P.davidiana contributed most in the dead individuals with large DBH.No difference was observed in the tree mortality among different habitat types,but the mortality of the individuals with different size classes showed greater variation.

关 键 词：长白山 森林动态样地 次生杨桦林 树木生长 树木死亡 径级 

分 类 号：S718.5[农业科学—林学]