大兴安岭南段阔叶次生林空间格局及种间关系

摘要

In Saihanwula Forest Ecosystem Research Station of southern Daxing ’ an Mountains we used the CTFS ( Center for tropical forest science ) sample area construction standards to build 6 hm2 fixed sample plot of broadleaved secondary forest . By using point pattern analysis , we studied the community within the main population spatial distribution pattern and inter-specificrelationship.Incommunity,thereweresevenspecies,atotalof13906trees,thepopulationdensityof2317hm2. The dominant population of broadleaved secondary forest in southern Daxing ’ an Mountains are aggregation distribution , and the intensity of population aggregation change is more obvious .Intensity aggregation value L( t) is Quercusmongolica>Betuladahurica>Betulaplaty phylla>Populus davidiana Dode.The interspecific relationship of broadleaved secondary forest in southern Daxing ’ an Mountains is positive correlation with less competition and replacement of tree species within the community , and the community composition and structure are in a stable state .The main cause of the high proportion of dry wood in community is not the competition between species .%在大兴安岭南段的赛罕乌拉森林生态系统定位研究站，采用CTFS样地建设标准，设置面积为6 hm2的阔叶次生林固定样地。采用点格局分析方法，对群落内主要种群的空间格局及种间关系进行了研究。结果表明：群落内乔木层共出现7个种群，树木共计13906株，群落密度2317株/hm2；大兴安岭南段阔叶次生林优势种群均呈现聚集分布，种群的聚集强度随尺度变化较明显；聚集强度L（ t）值：蒙古栎＞黑桦＞白桦＞山杨；大兴安岭南段阔叶次生林群落种间关系以正相关为主，群落内树种之间的竞争以及物种更替现象并不激烈，群落组成和结构正处于稳定状态，群落内较高比例枯立木的产生并非是种群竞争所致。