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苹果全爪螨是影响我国苹果生产的重要害虫之一.为明确其在苹果树冠上的时空格局,在2007年5—11月整个生长季节,采用不同方位、不同层面随机取样的方法调查害螨数量.应用聚集度指标法和Iwao回归测度法分析苹果全爪螨在苹果树上的分布型及其变化动态.结果表明:苹果全爪螨在苹果树冠整体范围内前期和中期符合负二项分布,呈聚集型,基本成分为个体群,且个体间相互吸引.聚集强度随种群密度的消长而波动,表现出高密度、低聚块及低密度、高聚块的规律,并且在树冠的不同方位和不同层面上存在一定差异:个体群的聚块性南部最高,西部最低;树冠中、下层高于上层,内层高于外层.
Apple mite is one of the important pests that affect the apple production in China.In order to clarify its space-time pattern on the apple tree top, apple mites were surveyed by random sampling at different azimuthal and azimuth levels during the whole growing season from May to November in 2007 The results showed that there was a negative binomial distribution in the early and middle stages of the apple crown in the whole apple canopy, and the distribution pattern of the apple mite in apple tree was analyzed by the degree of aggregation index method and the Iwao regression analysis method , Aggregated, the basic components of individual groups, and the mutual attraction between individuals. Aggregation intensity fluctuates with population growth and decline, showing high density, low agglomeration and low density, high agglomeration of the law, and in different crown There are some differences in azimuth and different levels: the agglomeration of individual groups is highest in the southern part and the lowest in the western part; the middle and lower parts of the crown are higher than the upper part and the inner part is higher than the outer part.