绿僵菌药后草原蝗虫种群空间分布型研究  

Spatial distribution of groasshopper populations under control by Metarhizium oil liquid

作　　者：宋树人[1] 张泽华[1] 高松[1] 农向群[1] 王广君[1] 

机构地区：[1]中国农业科学院植物保护研究所,植物病虫害生物学国家重点实验室,北京100081

出　　处：《昆虫学报》2008年第8期883-888,共6页Acta Entomologica Sinica

基　　金：国家科技支撑计划(2006BAD16B04-1);科技部农业科技成果转化资金项目(2007GB23260405);国家外国专家局引推项目(Y20070326006)

摘　　要：综合多个聚集度指标对绿僵菌药后田间蝗虫和僵虫的空间分布型进行了研究。结果表明:施药后不同时间随蝗虫种群密度的减小,处理区残虫的分布型呈现聚集-随机交错变动,僵虫的空间分布型为聚集分布。采用Taylor幂法则和改进的Iwao模型分析表明,整个调查时段处理区残虫、僵虫的空间分布均为聚集分布。推测认为,药后蝗虫点片状死亡,部分地片相对密度较高,残虫分布型趋向聚集;自然消除作用使僵虫密度很低,低密度下取样产生大量空样本,僵虫的分布型产生聚集假象。The spatial distribution of residual grasshoppers and cadavers following control by Metarhizium flavoviride oil spray were surveyed and analyzed with some indexes comprehensively at different sample intervals,and the results were further verified with Taylor＇s power law and the improved Iwao＇s regression method.The results showed that the spatial pattern of residual grasshoppers had the characteristics of mixed patterns of regular aggregation and random distribution with the decrease of population density,while cadavers were in aggregated pattern of distribution at different sample intervals.The analysis of Taylor＇s law and improved Iwao＇s patchiness showed that the spatial pattern of residual grasshoppers and cadavers were all in aggregated distribution pattern during the whole investigation period.It is inferred that different reduced degrees of densities in some plots after Metarhizium flavoviride oil spray caused the aggregated distribution of residual grasshoppers while cadavers showed a false appearance of aggregated distribution due to lower density and less sampling numbers.

关 键 词：草原蝗虫 生物防治 绿僵菌 疾病流行 种群 空间分布 聚集分布 

分 类 号：Q968.1[生物学—昆虫学]