摘要
分析了长白山红松阔叶混交林林冠空隙(Gap)内更新树种的数量特征.结果表明,在34个林冠空隙中,更新乔木树种出现频度为7.27%,更新灌木树种出现频度为21.02%,Gap形成后,阳性先锋树种首先侵入,出现频度较高,占据较宽的生态位,随着Gap年龄的增加,树种间的竞争逐渐增大,阳性树种的生长逐渐受到限制,阴性树种逐渐增多;Gap年龄与Gap郁闭度和Gap面积呈负相关,Gap面积与树种出现频度呈负相关;Gap年龄主要分布在5~15a和46~55a两段期间,树种出现频度与Gap年龄存在着密切关系,当Gap年龄小于25a时,二者呈正相关;当Gap年龄在25~40a时,二者呈负相关;当Gap年龄大于40a时,树种出现频度趋于稳定;34个Gap内4种主要乔木更新树种和4种主要灌木更新树种的胸径均基本上呈正态分布,乔木更新树种的最高点胸径为4~6cm径级,灌木更新树种的最高点胸径为1.2cm径级.
Analysis on the quantitative characteristics of regenerated tree species in 34 gaps of Korean pine broad leaved mixed forest in Changbai Mountains shows that the frequency of regenerated arbor species was 7.27%, and that of shrub species was 21.02%. After gap formation, the light demanding pioneer tree species invaded first in gaps, with high frequency and wide niche. With the aging of the gaps, the competition among tree species became strong, the growth of light demanding tree species was limited and meanwhile, the shade tolerant tree species became dominant. There was a negative relationship between gap age and its canopy density and area, and between gap area and emergence frequency of tree species. The distribution of gap age was mainly in two periods, from 5 to 15 years and from 46 to 55 years. There was a close relationship between species frequency and gap age. The relationship was positive when gap age was less than 25 years, negative when gap age was from 25 to 40 years, and the emergence frequency of tree species tended towards stable when gap age was more than 40 years. Among the 34 gaps, the diameter at breast height(DBH) of 4 major regenerated arbor species and 4 major regenerated shrub species was a normal distribution. The DBH of the highest regenerated arbor species was 4~6cm, and that of the highest regenerated shrub species was 1.2cm.
出处
《应用生态学报》
CAS
CSCD
1998年第5期449-452,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
中国科学院长白山森林生态系统开放研究站资助
关键词
林冠空隙
红松阔叶混交林
树种更新
动态规律
Gap, Regeneration, Korean pine broad leaved mixed forest, Changbai Mountains.