摘要
本文对麦地种蝇(Deliacoarctata(Falln))幼虫的空间分布型及抽样技术进行了研究。结果表明:1.麦地种蝇幼虫在冬小麦大田中的空间分布属奈曼A型分布与负二项分布兼有的聚集分布类型,并以个体群的形式存在,聚集的原因是环境因子及该虫生活习性所致;2.随着样方面积的减小,该虫随机分布出现的概率有增加的趋势,田间调查以0.056m ̄2样方面积较为适宜;3.当t=1,D=0.1、0.15、0.2时,虫口密度所需最适理论抽样数分0.8933,4.序贯抽样上下限,当m_0=1.5时。
The main results obtained are as follows:(1)The spatial distribution pattern for the larvaeof Delia coarctata is in the form of Neyman A and in the form of aggregation with negative bino-mial distribution concurrently. The population occurs in colonies due to surroundings and lifehabits.(2)The probability of random distribution of pest trends to increase with the decrease ofsampling areage. It is appropriate to carry out field investigations in 0.056m ̄2 sampling areage.(3)The optimum theoretical sampling numbers are respectively when t=1,D=0.1,0.15 and 0.2.(4)The sequential sampling model is when m_0=1.5.
出处
《甘肃科学学报》
1995年第4期42-46,共5页
Journal of Gansu Sciences
基金
甘肃省科委中青年自然科学基金