新疆棉田牧草盲蝽的空间分布规律

Spatial distribution pattern of common meadow bug Lygus pratensis(Linnaeus)in Xinjiang cotton fields

为明确新疆棉田牧草盲蝽Lygus pratensis(Linnaeus)的空间分布型,于2012-2014年对新疆喀什地区棉田牧草盲蝽种群数量进行了系统调查,应用5种聚集度指数、Iwao m*-m回归方程和Taylor幂法则分析判定牧草盲蝽成虫、若虫及整个种群(成虫和若虫)在棉田的空间分布型,并利用种群聚集均数分析聚集原因。结果表明,牧草盲蝽成虫、若虫及整个种群的久野指数C_A>0、负二项分布参数k>0、丛生指数I>0、聚块指数m*/^->1,表明三者在新疆棉田均呈聚集分布。且牧草盲蝽成虫和若虫的Blackith聚集均数λ<2,说明二者在棉田的聚集是由环境因素引起的。Iwao m*-m回归分析结果表明,牧草盲蝽成虫、若虫和整个种群个体间相互吸引,分布的基本成分为个体群(α>0、β>1);Taylor幂法则分析结果表明,牧草盲蝽成虫、若虫和整个种群在棉田更趋向于聚集分布,聚集度依赖于密度。

To clarify the spatial distribution pattern of common meadow bug Lygus pratensis（Linnaeus）in cotton fields in Xinjiang Uygur Autonomous Region,the population abundance of L.pratensis adults,nymphs and complex population（adults and nymphs） in cotton fields were investigated in Kashgar of Xinjiang during 2012-2014.The spatial distribution pattern of L.pratensis was determined by five aggregation indexes,Iwao＇ s regression equation and Taylor＇s power law.In addition,the assembling reasons were analyzed by using aggregation averages（λ）.The results showed that the spatial distribution pattern of L.pratensis adults,nymphs and complex population were aggregated distribution in cotton fields,with Kuno index C_A0,negative binomial distribution parameter k0,clumping index /0,and patchiness index m＊ /（） 1,Furthermore,the reason of the aggregation of L.pratensis adults and nymphs might be due to some environmental factors（λ〈2）.L.pratensis adult,nymph and complex populations were mutually attracted among individuals based on Iwao＇ s power law,and the individual groups were the basic components（α〉 0,β〉1）.L.pratensis adult,nymph and complex populations tended to exhibit aggregated distribution in cotton fields based on Taylor＇ s power law,and aggregation was depended on the density.