长白山红松阔叶林林冠空隙特征的研究

将林冠空隙干扰作为红松阔叶林动态维持的重要因素，对长白山红松阔叶林林 冠空隙的形成方式、出现频度、分布格局、结构及林冠空隙内形成本的数量、年龄分布、种 群特征等进行了系统分析．结果表明．长白山阔叶红松林多数林冠空隙由双形成本形成， 每个林冠空隙拥有的形成木为２．４４株；林冠空隙形成的速率为０．９２个ｈｍ２·ａ－１，林冠空 隙干扰的间隔期（周转期）为７５１ａ；扩展林冠空隙面积大多在１００～６００ ｍ２之间，其中以 ４００～５００ ｍ２所占比例最大．冠空隙在５０～３５０ ｍ２之间，其中以２００～２５０ ｍ２所占比例最 大；每个形成本所形成的扩展林冠空隙平均面积为 １４１ ８２ ｍ２，形成的冠空隙面积平均为 ６７．６３ ｍ２．

Characteristics or gap in Korean pine broad-leaved forests in Changbai mountain

Selecting gap disturbance as an important factor in sustaining the dynamic balance of Korean pine broad-leaved forests. the gap-forming manner. its distribution pattern, frequency of gap disturbance, and percentage of gap area in Korean pine broad-leaved forest were Systematically analyzed. The results show that "lost of the gaps in Korean pine broad-leaved forest are produced by 2 fallen trees, the frequency of gap is 0. 92 hm2' yr- l, with a pened of 751 years, the size of expanded gap (EG) and that of canopy gap (CG) are 100~ 600 and 50~350 m2, statistically centralized at 400~500 and 200~250 m2, respectively, the area of expanded gaps and canopy openings average 141. 82 and 67. 63 m2. respectively.