甘蔗条螟卵空间分布型及其抽样技术

摘要

Based on aggregation index method, Iwao's regressive model analysis method and Taylor's power law method, the spatial distribution pattern and sampling technique of egg masses of Chilo sacchariphagus Bojcr on autumn sugarcane plants were analyzed. The results showed that the distribution pattern of the egg masses of C. Sacchariphagus was negative binomial aggregative distribution. The basic component of the spatial distribution was individuals attracting each other in 5 m× 1.3 m unit. And the aggregation intensity was enhanced with the increase of population. Meanwhile, the aggregation reason was related to the egg mass density. Five-point sampling was the best method for field surveys. The theoretical sampling model of egg mass was N= t2/D2(l. 098/m+0.147).%应用聚集度指标法、Iwao回归模型法和Taylor幂法等,对甘蔗条螟(Chilo sacchariphagus Bojer)卵块在秋植蔗田的空间分布和抽样技术进行研究.结果表明,甘蔗条螟卵块在田间呈现负二项分布的聚集型分布;在单位样方(5 m行长,1.3m行距)内,个体间相互吸引,分布的基本成分为个体群,其聚集强度随密度升高而增加；条螟卵块聚集原因同卵块密度相关；在田间抽样方式上,以五点取样效果最佳；卵块理论抽样模型为N=t2/D2(1.098/m+0.147).