不同混交林青杨天牛种群动态研究

2006—2008年,对山西省同朔地区金沙滩林场4种不同林分内青杨天牛自然种群进行了调查,分析结果表明,青杨天牛种群死亡率的最大变化都发生在一期幼虫期,说明该虫期是关键时期或关键虫期;另外,成虫期的发生数量决定下一代的产卵数量。杨树纯林,杨树—油松混交林,影响青杨天牛种群数量变动的关键因子是菌寄生;而杨树—油松—沙棘混交林和杨树—油松—沙棘—柠条混交林,影响青杨天牛种群数量变动的关键因子是啄木鸟啄食。

Studies on Population Dynamic of Saperda papulnea L in Mixed Forests

The life tables were made from the investigation on natural population of saperda papulnea L in four different stand types of Jinshatan forestry centres seated in Tongshuo of Shanxi Province,and then the lethal and key factors were analyzed.The conclusions were as follows: life table conclusion: the variety on mortality rate of saperda papulnea L first instar larvae was the highest.So,it suggested that this stage was key stage or key larve stage.And we also found the laying of offspring was determined by th...