东北春大豆田间黄蓟马空间分布型及抽样技术

Spatial distribution pattern and sampling technique of Thrips flavus Schrank in spring soybean field in northeast China

为明确大豆田黄蓟马的空间分布型及理论抽样数,指导田间取样,采用6种聚集度指标、Iwao回归分析法和Taylor幂法则分析了黄蓟马成虫、若虫和整个种群(成虫和若虫)在大豆田间的空间分布型,并且进行空间分布型适合度卡方检验,确定所属空间分布型,对聚集因素作出分析,根据Iwao的理论抽样数模型确定最适理论抽样数。结果表明,黄蓟马成虫、若虫和整个种群在大豆不同生育期的空间分布型均为聚集分布,Iwao回归分析法显示黄蓟马个体间相互吸引,分布的基本成分是个体群。Taylor幂法则分析表明,黄蓟马成虫、若虫和整个种群聚集度依赖密度,且随着平均密度的升高聚集程度越强。卡方检验的结果也为聚集分布。黄蓟马的种群集数λ均大于2,说明黄蓟马种群的聚集原因可能由其生活习性或其本身的聚集行为及环境因素共同作用所致。黄蓟马成虫的理论抽样方程N=(2.219 9/+0.117 6)/D^2,若虫的理论抽样方程N=(1.554 9/+0.072 8)/D^2,黄蓟马整个种群的理论抽样方程N=(1.928 4/+0.003 5)/D^2。本文结果为黄蓟马田间取样提供理论依据。

Thrips flavus is a kind of important pest on soybean plants in some areas in China in recent years. In this paper,the spatial distribution patterns of sugarcane worsening seedlings were analyzed by using six kinds of aggregation index method,Iwao regression analysis and Taylor power law to analyze the spatial distribution patterns of adults,nymphs and complex population（ adults and nymphs） in the field of soybean. The spatial distribution type fidelity chi-square test was used to determine the spatial distribution type,and the aggregation factors were analyzed. According to Iwao＇s theoretical sampling number model,the optimal number of sampling samples of the adults and nymphs of soybean T. flavus were determined. The results showed that the spatial distribution patterns of adults and nymphs and complex population in soybean were aggregated in different growth stages of soybean,and Iwao＇s regression analysis showed that T. flavus were attracted to each other,and the basic components of the distribution were individual aggregation distribution. The Taylor law reflected the density of adults,nymphs and complex population dependent aggregation degree,and the degree of aggregation increased with the increase of average density. The results of chi-square test were also aggregated. The population number of the adults and nymphs of T.flavus were greater than 2,indicating that the aggregation of T. flavus population might be due to the synergistic effect of the population habitat or its own agglomeration behavior and environmental factors. The theoretical sampling equation of T. adults was N =（ 2. 219 9/＋ 0. 117 6）/D^2. And the theoretical sampling equation of the T. flavus nymphs was N =（ 1. 554 9/＋ 0. 072 8）/D^2. The theoretical sampling equation for the whole population of T. flavus was N =（ 1. 928 4/＋ 0. 003 5）/D^2. This paper provided a theoretical basis for field sampling of T.flavus on soybean.