水稻田福寿螺序贯抽样技术研究

在对宁波市水稻田福寿螺种群分布进行调查分析的基础上,研究了福寿螺在水稻田中的序贯抽样技术。结果表明:福寿螺的平均拥挤度M*与平均密度m的回归方程为M*=1.6194+1.2123 m;以Iwao的序贯抽样为基础,结合Kuno的序贯抽样的复序贯抽样技术为:防治指标上限T0(′n)=3n+1.96(9.7689n)~(1/2),下限T0′′(n)=3 n-1.96(9.7689n)~(1/2),截止线T(n)=2.6194/(D02-0.2123/n)(t=1.96,D0=0.15),最大抽样样本数为n=62。

Studies on Sequential Sampling Technique of Pomacea canaliculata (Lamarck) in Paddy Field

Based on the investigation of distribution and population dynamics of golden apple snail Pomacea canaliculata(Lamarck) in the paddy field of Ningbo city,the sequential sampling technique of P.canaliculata was studied.The results showed that the regressive equation between mean crowding(M) and mean density(m) of P.canaliculata was M =1.6194+1.2123m,on the basis of the Iwao's sequential sampling technique combined with the Kuno's sequential sampling technique,the complex sequential sampling technique was put forward.The upper limit,lower limit and close line were T0′(n) =3n + 1.96(9.7689n)~(1/2),T0′′(n) =3n-1.96(9.7689n)~(1/2),T(n)=2.6194/(D02-0.2123/n)(t=1.96,D0=0.15) for target pest,respectively.The largest number of sampling specimen was 62.