瓜实蝇成虫在苦瓜田间的时空动态

Spatio-temporal dynamics of adult Bactrocera cucurbitae( Diptera: Tephritidae) in bitter gourd field

【背景】瓜实蝇是重要的瓜果害虫,研究其在田间的时空分布可为进一步探讨成虫在栖息地的迁移规律奠定基础。【方法】试验于2013年9月17日-11月8日在广州市白云区广东省农业科学院试验基地进行。试验地面积约6900 m^2,其中,苦瓜地面积为34 m×19 m。以黄绿色粘板进行诱捕取样,点算粘板上瓜实蝇雌、雄成虫个体数,以地学统计学方法研究瓜实蝇成虫的时空分布动态。【结果】瓜实蝇成虫密度有2个峰;其半变异函数多为高斯模型,在调查范围内空间格局为聚集分布,变程范围为9.648-65.580 m,空间异质性是由空间自相关引起。【结论与意义】运用Kriging插值法,由软件Surfer10.0绘制的密度等值线图清楚地反映出瓜实蝇成虫主要分布于苦瓜地内,呈现出瓜实蝇成虫被苦瓜吸引,并迅速繁殖及之后向瓜地外扩散的变动特征。

[Background] Ba ctrocera cucurbitae is an important pest of many fruits and vegetables.The spatio-temporal distribution of adult B.cucurbitae was investigated to explore the pattern of adults migrating back and forth between habitats.[Method] The re-search was undertaken from 17 Sept.to 8 Nov.2013, in an agricultural field （6900 m^2） planted with bitter gourd （34 m×19 m） at the experimental farm of the Guangdong Academy of Agricultural Sciences, Baiyun District, Guangzhou.The activity of adult B.cu-curbitae was monitored using green sticky traps.Geostatistical methods were used to characterize the spatio-temporal distribution of a-dults.[Result] There were two peaks of adults.Semivariograms could be described by a Gaussian model.Spatial patterns were ag-gregate in the investigated site.The range of spatial correlation was from 9.648 m to 65.580 m, with a high degree of spatical auto-correlation.[Conclusion and signifinace] The isoline maps created by the geostastical software surfer 10.0 with Kriging interpolation clearly reflected that adult B.cucurbitae were primarily concntrated inside the bitter gourd field.Only after reaching high densities did adults spread beyond the bitter gourd field.