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当前位置: 首页 > 文章 > 二化螟幼虫的田间分布 昆虫学报 1991,34 (3) 303-310
Position: Home > Articles > THE SPATIAL DISTRIBUTION OF CHILO SUPPRESSALIS WALKER LARVAE IN PADDY FIELD Acta Entomologica Sinica 1991,34 (3) 303-310

二化螟幼虫的田间分布

作  者：
孙建中;杜正文
单  位：
江苏省农科院植保所
关键词：
二化螟;空间分布;行为
摘  要：
本文通过采用平均拥挤度的概念,运用动态分析方法,对二化螟(Chilo suppressalis WALKER)幼虫在稻田的空间格局进行了系统的研究。就聚集强度、格局纹理及动态的扩散过程进行了描述,综合地分析了各龄期幼虫空间格局的形成与演变,并揭示了幼虫种群在稻田的分布特征及分布形成的内在过程,明确了二化螟幼虫空间分布研究在生态学及害虫管理上的意义。
译  名：
THE SPATIAL DISTRIBUTION OF CHILO SUPPRESSALIS WALKER LARVAE IN PADDY FIELD
作  者：
SUN JIAN-ZHONG DU ZHENG-WEN (Inssisute of Plant Protection,Jiangsu Academy of Agricultural Sciences,Nanjing 210014)
关键词：
Chilo suppressalis Walker----spatial distribution----behaviour
摘  要：
The spatial distribution patterns of the larvae of the striped stem borer Chilo suppresalis Walker in paddy field are systematically studied and analyzed with the concept of mean crowding (m).The larval aggregational intensity,aggregational grain and process of dispersal are described in detail and the formations of spatial distribution of larvae in different ins-tars are discussed.The conclusions are as follows:1.Analysis of the distribution patterns of larval population within the paddy field by m-m regression method indicates that the basic component (α) of larval distribution varies with larval instars,from an individual clump in early instars to a single individual in late instars.The distribution of the basic component (β) for different larval instars shows that all distributions are aggregational(β>1,β is a measure of the spatial disposition of clumps).The patch ness size at late (fifth-sixth) instar stages is about one hill of rice.2.The dispersal of larvae in the paddy field is a non-random immvement aceording in c<2 (Freeman,1977),and the average dispersal radius is 28.5 cm in the japonica rice yuan-fengzao and 41.2cm in the hybrid rice Shanyou 3.The maximal dispersal radius is less than 100 cm in different rice varieties.3.The larval dispersal rate varies with different developmental stages.Dispersal rates in the hybrid rice fields at early,middle and late stages (10 days per stage) are 2.2340,2.0535 and 2.0517cm/2 days respectively.When the rale of dispersal is decreased the number of dead-hearts would increase rapidly.4.A synthetic analytical method of 'mean aggregation(λ)' (Southwood,1978) in association with 't' index (Iwao & Kuno,1971) is applied for revealing the aggregation and dispersal causes of the striped stem Borer.The results indicate that the 't' values vary with instars from 0.46 (first and second instars) to 0.97 (fifth and sixth instars).The mortality and dispersal process of the larvae are restricted by the larval density when t<1.The density-dependent effect on larval population would gradually decrease as the larval instar increases.According to the 'mean aggregation (λ)' calculated for the fifth and sixth instars,e.g.*λ<2,the aggregation of mature larvae is probably affected by some environmental factors and not by active process.The value of 't' for mature larvae is about a unity.It can be concluded that the processes of mortality and dispersal of mature larvae are restricted by random factors.

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