本研究对香梨园各世代山楂叶螨种群生命表的趋势动态指数Ⅰ、控制指数(EIPC)、关键虫期、关键因子、关键因子与种群密度关系进行分析,建立最优回归预测方程,以评价影响山楂叶螨种群发展的各因子的作用.结果表明,山楂叶螨种群11代的种群趋势指数分别为0.98、8.90、3.74、0.87、0.41、0.22、0.02、1.00、2.09、2.23、2.97.“捕食及其他”和“自然死亡”因子是影响山楂叶螨种群各世代数量动态的重要因子.幼螨期是山楂叶螨的关键虫期,在幼螨期的“捕食及其他”因子是关键因子,关键因子是山楂叶螨种群变化的迟滞密度制约因子.%To evaluate the factors that affect the natural population dynamics of Amphitetranychus viennensis (Zacher) on Korla pear, parameters, such as the index of population trend (/), exclusion index of population control (EIPC), key instar, key factor and the relationship between the key factor and population density of each A. Viennensis generation were analyzed to build the optimal prediction model. The results showed that the indexes of population trend for eleven generations of A. Viennensis were 0.98,8.90,3.74,0.87,0.41,0.22,0.02,1.00, 2.09,2.23 and 2.97, respectively. "Predation and others" and "natural death" were two key factors that affected the population dynamics of each generation. The nymphal stage was the key stage and the "predation and others" was the most important factor that affected the population quantity of nymphs. This key factor was a density-dependent factor.
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