摘要
通过对大兴安岭北部火烧迹地上猖獗发生的落叶松八齿小蠹(Ips subelongatus Motsch.)的雄虫(侵入孔)空间分布型及其群居危害机理的分析,该虫雄虫的空间分布属聚集分布。扩散蔓延规律为聚集型,其程度同火烧程度一样。随有虫株率及虫口密度的变化而改变。当有虫株率达100％,虫口密度大于7个侵入孔/1000 cm^2。时趋于均匀分布。对此虫群居危害原因分析可知,造成聚集分布的根本原因是寄主落叶松衰弱木的聚集分布及先锋雄虫释放聚集信息素的综合作用。
Larch Bark Beetle outbreak in the Northern of Daxing'anling after one year of forest fire. The spatial distribution pattern of male larch bark beetle belongs to aggregation. The aggregated level vary with degree of fire, percentage of attacked-tree with beetle, or density When percentage of attacked-tree with beetle is near 100％, and density is greater than 7 attacks/1000cm^2, it tend to a uniform distribution. The basic mechanism of aggregated distribution is integrated effects of larch trees aggregated distribution and aggregation pheromone excreted male beetle.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1989年第6期51-57,共7页
Journal of Northeast Forestry University
关键词
落叶松
八齿小蠹
分布
群居危害
Ips subelongatus
Spatial distribution
Collonization attack
