扫网法取样下稻田节肢动物群落组成分析

为明确扫网法取样下有机稻田和化防稻田节肢动物群落组成,采用扫网法,通过连续2年调查取样,研究了有机稻田和化防稻田节肢动物群落组成。结果表明,在2种类型稻田内,连续2年共查得节肢动物15 590头,分属于98科。在2010年水稻生长期,在有机稻田内,主要害虫分属于蓟马科Thripidae、飞虱科Delphacidae,其相对丰盛度分别为0.2510、0.2062,主要天敌分属于肖蛸科Tetragnathidae,其相对丰盛度为0.1389。在化防稻田内,主要害虫分属于飞虱科Delphacidae和叶蝉科Cicadellidae,其相对丰盛度分别为0.2750、0.1305。主要天敌分属于肖蛸科Tetragnathidae,其相对丰盛度为0.2070。在2011年水稻生长期,在有机稻田和化防稻田内,主要害虫均分属于飞虱科Delphacidae,其相对丰盛度分别为0.4879、0.4049。主要天敌均分属于肖蛸科Tetragnathidae,其相对丰盛度分别为0.1831、0.1649。综上所述,扫网法适合采集生活于水稻中上部的节肢动物。

Analysis of the arthropod community composition in paddy fields by sweep net sampling

The sweep net sampling method was used to determine the arthropod community composition in organic and chemical control paddy fields in 2010 and 2011. The results showed that a total of 15 590 arthropods, belonging to 98 families, were collected in two years. In the organic paddy field in 2010, the main pests belonged to Thripidae and Delphacidae and the relative abundance was 0.2510 and 0.2062, respectively. The main natural enemies belonged to Tetragnathidae and the relative abundance was 0.1389. In the chemical control paddy field in 2010, the main pests belonged to Delphacidae and Cicadellidae and their relative abundance were 0.2750 and 0.1305, respectively. The main natural enemies belonged to Tetragnathidae and the relative abundance was 0.2070. In 2011, in both organic and chemical control paddy fields, the main pests belonged to Delphacidae and the relative abundance of which were 0.4879 and 0.4049, respectively. The main natural enemies belonged to Tetragnathidae and its relative abundance were 0.1831 and 0.1649, correspondingly. In conclusion, sweep net sampling method is suitable for collecting arthropods living in the upper part of rice.