Zou Yunding, Zhou Xiazhi, Bi Shoudong, Li Lei, Gao Caiqiu, Ding Chengcheng
Anhui Agricultural University, Hefei 230036, China.
Ying Yong Sheng Tai Xue Bao. 2003 Sep;14(9):1485-8.
Investigations on the Erythroneura sudra and Erigonidum graminicola populations in three layers (upper, middle and lower) and four directions (east, south, west and north) of peach tree crown showed that both of them had aggregated spatial distributions in these 7 part, because 5 parameters used to analyze the distribution reached required standard. Each insect was attracted by the others, as the parameter (alpha) in Iwao formulation m* = alpha + beta x - (1971) was positive. The average density of aggregation was the biggest in its middle layer and east direction, and the smallest in its lower layer and south direction. The biggest average density of aggregation appeared in mid-September.
对桃树树冠三层（上、中、下）和四个方向（东、南、西、北）的桃一点斑叶蝉和麦圆蜘蛛种群进行调查，结果表明，由于用于分析分布的5个参数达到要求标准，它们在这7个部位均呈聚集分布。根据岩尾公式m* = α + βx -（1971）中的参数（α）为正值可知，每种昆虫都受到其他昆虫的吸引。聚集平均密度在树冠中层和东方位最大，在树冠下层和南方位最小。聚集平均密度最大值出现在9月中旬。
