引用本文:[点击复制]
[点击复制]
【打印本页】 【在线阅读全文】【下载PDF全文】 查看/发表评论下载PDF阅读器关闭

←前一篇|后一篇→

过刊浏览    高级检索

本文已被:浏览 486次   下载 88  
稻纵卷叶螟幼虫田间分布型及取样方法研究初报
0
()
摘要:
调查结果表明:稻纵卷叶螟的虫苞及幼虫田间分布型属聚集分布。其分布与水稻尽势等环境因素有关。当允许误差D=0.2时,不同幼虫虫口密度(?)下的抽样数量为n=3.7+26.9/(?)。在几种取样方法中以平行线法较好。
关键词:  稻纵卷叶螟,田间分布型,取样方法
DOI:
基金项目:
STUDY ON SPATIAL DISTRIBUTION PATTERN AND SAMPLING METHODS OF THE RICB CASE WORM, CHAPHALOCROCIS MEDINALIS
()
Abstract:
According to the obsevation on the distribution of worm-buds and larvae of the rice case worm, it is determined that their spatial distribution pattern is an aggregated one. Their aggregation is due to some environmental factors such as rice grouth features. When acceptable error D=0.2, the sampling numbers for larvae densities(?) with different means are n=3.7+(26.9)/(?). Several sampling methods are compared, and the results show that the parallel line sampling method is the best.
Key words:  Rice leaffolder,Spatial distribution pattern,Sampling method.

用微信扫一扫

用微信扫一扫