阿拉善舌喙象成虫在长柄扁桃上的空间分布型及抽样技术

Spatial distribution pattern and sampling technique of Diglossotrox alashanicus adults on endangered plant Amygdalus pcdunculata

【目的】明确阿拉善舌喙象成虫在陕北沙区长柄扁桃上的空间分布型和抽样技术,为枣飞象的监测和科学控制提供理论依据。【方法】于2018年4月,在陕西省榆林沙区,采用平行线取样法抽取受害长柄扁桃植株,使用全株调查法统计阿拉善舌喙象成虫数量。运用7种聚集度指标、Iwao m~*-m回归分析法和Taylor幂法则对阿拉善舌喙象成虫的空间分布型和抽样技术进行探讨。【结果】阿拉善舌喙象成虫在长柄扁桃上的空间分布型呈现聚集分布,分布的基本成分为个体间相互吸引个体群,其密度越大,个体群的聚集度越高;聚集因素分析表明,该虫聚集分布是由某些环境成分和自身的聚集习性两者共同作用所引起。依据Iwao m~*-m回归分析确定阿拉善舌喙象成虫最佳理论抽样公式和序贯抽样模型,利用序贯抽样模型公式对该虫进行抽样,当阿拉善舌喙象的防治阈值为6头/株,调查10株长柄扁桃树上的累计虫口数量大于85头时,则需进行及时防治;若10株长柄扁桃树上的累计虫口数量小于35头时,则不需进行防治;若10株长柄扁桃树上的累计虫口数量为35~84头,则需要继续进行抽样调查,并根据具体情况确定是否需要采取防治措施。【结论】建立的空间分布型和最佳理论抽样公式,可用于陕北沙区阿拉善舌喙象的监测和综合控制。

【Objective】To provide basic information for ecological regulation of Diglossotrox alashanicus Suvrov,the distribution pattern and sampling technique of D.alashanicus adult in Amygdalus pcdunculata was studied.【Method】The parallel sampling line method was used to extract attacked A.pcdunculata trees in Yulin sandy area in April 2018,and the number of weevil adults were investigated by comprehensive survey.The spatial distribution pattern and sampling technique of D.alashanicus adults were studied using the 7 aggregation indexes,Iwao m*-m regression analysis method and Taylor’s power law.【Result】The spatial distribution pattern of D.alashanicus adult in A.pcdunculata trees was aggregation distribution.The basic component was a group of individuals,and the individuals attracted each other.Greater density led to higher degree of aggregation.Aggregation factors showed that the distribution of weevils was caused by the combination of some environmental components and their own aggregation habits.According to the m*-m regression analysis of Iwao,the best theoretical sampling formula and sequential sampling model of D.alashanicus were determined.When the control threshold of adult was 6 heads per plant,measures for controlling D.alashanicus should be taken if the number of weevil adults in A.pcdunculata was over 85 heads/10 plants.When the number of weevil adults in A.pcdunculata was less than 35 heads/10 plants,no control measures were needed.When the number of weevil adults in A.pcdunculata was 35-84 heads/10 plants,it was necessary to continue sampling survey and determine whether prevention and control measures were needed specifically.【Conclusion】This study established spatial distribution pattern and theoretical sampling formula on D.alashanicus for the monitoring and integrated management of D.alashanicus.