稻水象甲种群空间分布格局初步研究

PRELIMINARY STUDY ON SPATIAL DISTRIBUTION AND APPLICATION OF LISSORHOPTRUS ORYZO PHILUS KUSCHEL

研究表明 ,稻水象甲越冬成虫在山上主要分布在表层上 3厘米以内。在稻周围中的水平分布 ,幼虫近稻根处多 ,远离稻根少 ;土茧分布在 12厘米范围内差异比明显。其垂直分布幼虫主要集中在离土表 6厘米内 ,土茧 95 %以上分布在离土表 3厘米内 ,幼虫结茧有向上爬习性。用 Iwao的平均密度的平均拥挤度回归分析法分析了不同世代稻水象甲的空间分布型 ,其结果表明成虫是具密度依赖的聚集分布。通过 Taylor的指数回归式参数初步确定了在一定精确度水平下的理论抽样数和序贯抽样模型。

Our research indicates the imagoes of Lissorhoptrus oryzophilus Kuschel are mainly distributed within 3 cm of the surface soil on the hill. The horizontal distribution around the rice plant showed there are more larvae near the rice root, less far from it and the cocoons are distributed with an obvious difference within a radius of 12 cm from the root. The vertical distribution shows larvae are mainly distributed within 6 cm below the soil surface, and 95 percent of the cocoons crowd within 3 cm below the surface. It also shows the larvae have the habit of climbing up when they form their cocoons. Iwao's distribution function is used to analyze the spatial distribution pattern of Lissorhoptrus oryzophilus Kuschel of different generations. The results indicate the aggregative distribution of imagoes depends on the density. The theoretical sampling number and the sequential sampling model with a certain precision are initially established according to Taylor's power law.