三星黄萤叶甲成虫在绞股蓝田的空间分布型及抽样技术研究

Study on spacial distribution pattern and sampling technique of Paridea angulicollis adult in Gyanostemma pentaphllum

【目的】明确三星黄萤叶甲成虫的空间分布型和抽样技术,为了解该害虫的发生、扩散行为,以及预测预报与治理决策提供科学依据。【方法】先在田间调查100个样点,每个样点1m2,记录三星黄萤叶甲成虫数量,绘制田间分布实况图;再用五点式、平行线式、对角线式、Z字形式和棋盘式5种抽样方法模拟抽样,比较这5种抽样方法与全查方式的调查结果;用最适抽样方式定点取样,记录三星黄萤叶甲成虫数量,分析其空间分布型。【结果】适合性检验以五点式的效果最好,平行线式和棋盘式次之;平行线式的抽样代表性最好,五点式和棋盘式次之;平行线式的变动幅度较低,增加1.455 9%。三星黄萤叶甲种群的空间分布型属于聚集分布,个体间相互吸引,且具有密度依赖性。三星黄萤叶甲的聚集原因由昆虫本身的习性和环境共同引起。田间调查时,可根据理论抽样数学模型及允许误差和虫口密度确定最适理论抽样数。【结论】田间调查三星黄萤叶甲时,可采用五点式、平行线式和棋盘式3种抽样方法,且以平行线式最为理想;三星黄萤叶甲成虫在绞股蓝田的空间分布型为聚集分布,且具有密度依赖性。

【Objective】 The study was done to make sure Paridea angulicollis Motschulsky adult in Gyanostemma pentaphllum Thunb feild＇s spatial distribution pattern and sampling method to provid a scientific basis for the occurrence and diffusion behavior and forecast and management decision-making.【Method】 A field distribution map was drawn by recording the number of adult in field which was investigated 100 point and each point was 1 m2,then five different methods（five point,parallel type,diagonal type,Z-size type,chessboard type） were compared with the whole feild investigation in order to find out the best sampling method.Spatial distribution pattern was analyzed by recording the number of P.angulicollis Motschulsky adult using the best sampling method.【Result】 Among the five sampling methods,the five piont sampling method was the best,then the parallel type and chessboard chessboard type.The parallel sampling method made the lowest error rate 0.45,and the lowest coefficient of variation 1.455 9%.The spatial distribution pattern of P.angulicollis Motschulsky adult was aggregated and was density-dependent.The aggregation was affected by some environmental factors and active process.The sampling mathematic model theory provided reference for the best sampling number in feild investigation.【Conclusion】 We could use five point,parallel,chessboard sampling methods for field investigation,and parallel sampling method was the best.The spatial distribution pattern of P.angulicollis Motschulsky adult in G.pentaphllum Thunb feild was aggregated and was density-dependent.