【摘要】 通过对安徽冬至县金寺山林场 2 7年中马尾松毛虫DendrolimuspunctatusWalker发生面积的时间序列和 2、 3代分化率及干旱记录进行相关分析 ,进一步探讨 2、 3代分化和干旱对马尾松毛虫种群时间序列动态的影响。马尾松毛虫 2、 3代分化率有一定的周期性 ,而且波动的幅度很大 ,大致可以分成低、中、高三个等级 ,三个等级的分化率范围分别为 1%～ 10 % ,11%～ 4 0 %和 4 1%～ 10 0 %。大致每隔 5～ 6年出现一次高分化率 ,高分化率的前后往往是低分化率 ,高分化率之间一般是中等的分化率和低分化率交替出现。通过分析马尾松毛虫 2、 3代分化对种群时间序列动态的影响 ,说明 2、 3代分化主要影响当代的数量 ,与以后各代数量无明显相关。 2、 3代分化前的种群数量与 2、 3代分化也无明显的相关。中等以上的分化率常引起松毛虫的发生。影响 2、 3代分化的主要气候因子是 7月份的气温 ,7月份的气温越高 ,卵孵化的高峰期越早 ,更多幼虫于分化的临界光周期以前孵化 ,分化率就高。干旱与 2、 3代分化有微弱的相关 ,对松毛虫时间动态的影响具有延迟作用 ,影响最明显的是第二年的第 1代 ,这说明干旱不仅影响当代松毛虫的动态 ,更重要的是通过影响寄主 ,从而影响到以后世代的松毛虫动态。更多还原

【Abstract】 The effect of the 3rd generation differentiation ratio and drought on the temporal dynamics of the mason pine caterpillar, Dendrolimus punctatus , is revealed by correlation analysis of 27 years’ data on the abundance of this species. The 3rd generation differentiation ratios of mason pine caterpillars fluctuate periodically and usually can be divided into three levels: 1%-10%,11%-40% and 41%-100%. The peaks occur about every 5 to 6 years with low differentiation ratios before and after the peaks. Moderate and low differentiation ratios alternate between peaks. Correlation analysis indicates that the 3rd generation differentiation ratio has a distinct relationship only with the occurrence rate of the present generation and not following generations. There is no correlation between 3rd generation differentiation ratios and the occurance rates of previous generations. The key climatic factor affecting differentiation ratios is the temperature in July. Under higher temperatures more larvae hatch before the critical photoperiod that causes high differentiation ratios. Though drought affects the differentiation ratio slightly, it has a delayed, but distinct, affection on occurrence rate. The most affected generation is the first generation of the following year. The results reveal that drought not only affects the dynamics of current generations of mason pine caterpillars but also, more importantly, affects the pines, which in turn affects the next generation of mason pine caterpillars.更多还原