【摘要】 选择10块不同立地条件的林分设样地,测定文山松毛虫越冬代幼虫的空间分布型,分别建立最适抽样数关系式,并对越冬代幼虫进行序贯抽样分析.结果表明:越冬代幼虫空间分布为聚集分布.当mo=21条/株时,最大抽样数为282株;mo=17条/株时,最大抽样数为188株.更多还原

【Abstract】 By having selected 10 sample plots in forest stand with different site conditions, the spatial distribution of overwintering larvae of Dendrolimus punctatus wenshanensis was studied, equations to determine the optimal sampling numbers were set up, and the sequence number sampling analyses were made. The results showed that the spatial distribution of the overwintering larvae of Dendrolimus punctatus wenshanensis was in aggregated form. When the larva density is 21 per plant, the maximum sampling number is 282 plants, while the density is 17 per plant, the maximum sampling number should be 188 plants.更多还原