摘要
1987年春天,于东北林业大学哈尔滨实验林场、海林林业局三部落经营所、海林县杨子荣烈士陵园及海林县海南林场,共选五块标准地,各抽样调查了30株标准树,每一标准树取4个样枝,以样枝上的叶丛为调查样方,实测样方上的虫数和频次。用分布型频次法和指数法检验结果表明,兴安落叶松鞘蛾第四龄幼虫和蛹属负二项分布和聚集分布。
In the spring of 1987, five sample plots were established in pure stands of larch in Harbin and Hailin Forestry Bureau. Thirty sample trees were sampled in each plot. Four branches in each sample tree were sampled and the larvae or pupae on the leaves of branches were calculated. Spatial distribution patterns of the fourth instar larvae and pupae of the casebearer(G. dahurica Flkv.)in China were measured by means of several indices. The results showed that their distribution patterns belong to aggregated distribution and negative binomial distribution.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1989年第5期33-39,共7页
Journal of Northeast Forestry University
关键词
落叶松
鞘蛾
第四龄幼虫
蛹
分布
Larch casebearer
Fourth instar larvae
Spatial distribution
