摘要
1989～1990年在河北省平原及丘陵地区对毛白杨林地进行了桑天牛(Apriona germari Hope)虫害发生的调查,采用空间格局、抽样方法的分析研究。其结果表明:幼虫空间格局趋于聚集分布,最佳抽样方法为双对角线式;幼虫分布高度随胸径增大而升高,虫量随胸径增大而增多;胸径<12cm时,虫道分布高度在6.3cm以下。因此,确定胸径12cm的粗度是防治关键粗度。根据聚集分布和关键粗度,确定预防、防治措施。
Surveys were given to the occurrence of apriona germari in the poplar stands in the areas of plain and hilly land of Hebei provincc in the years of 1989 and 1990. Based on the statistical analysis, spacial distribution pattern of the larva was determined as crowding one, and the best sampling method was double diagonal line sampling. Meanwhile,the bigger the DBH, the higher the distribution height of the larva on the trees, the more amount of the larva on the trees. The larva gallery of the tree which the DBH is less than 12 cm is decreased. According to crowding distribution and degree of thickness, control measure and period is decided, and control efficiency can be increased.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1993年第2期36-40,共5页
Journal of Northeast Forestry University
关键词
桑天牛
水平分布
垂直分布
Apriona germari
Horizonal distributions
Vertical distribution
