摘要
对桃树树冠上、中、下3层及东、西、南、北4个方位桃一点叶蝉及其天敌草间小黑蛛的系统调查分析表明,桃一点叶蝉及其天敌草间小黑蛛种群在7个部位的聚集强度其5个判断指数都大于聚集格局的判断标准,证明桃一点叶蝉及其天敌草间小黑蛛种群7个部位均为聚集格局,Iwao公式m=α+β中的α值均大于0,表明个体间互相吸引,其中树冠中层和东面树冠平均拥挤度最高,而树冠下层和南面树冠最低,在时间上平均拥挤度为9月中旬最高。
Investigations on the Erythroneur 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 (a) in Iwao formulation m* = a +Bx-(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.
出处
《应用生态学报》
CAS
CSCD
2003年第9期1485-1488,共4页
Chinese Journal of Applied Ecology
基金
安徽省重点科技资助项目(02023015)
关键词
桃—点叶蝉
草间小黑蛛
三维空间格局
时序动态
Erythroneura sudra, Erigonidum graminicola, Three-dimentional distribution pattern, Time series dynamics.
