【摘要】 褐飞虱Nilaparvata lugens （st（?）l）种群稳定增长初期（8月初）田间成、若虫拟合为负二项分布,卵为截尾负二项分布。由此导出理论抽样数模式。成、若虫为n=（1/D²）[（1/（?））+1/2.3854]或n=（t/D）²（1/（?）+1/2.3854）。卵为n=（9.1777/D²·（?））[1-P（1）]或n=（t/D）²·（9.1777/（?））[1-P（1）]。应用改进的（?）回归法,求得成、若虫的理论抽样数模式为n=（1/D²）[（7.4820/（?））+0.11（?）-1.322]或n=（t/D）²·[（7.4820/（?））+0.11（?）-1.322)。应用Taylor指数法得到理论抽样数模式为n=0.9932/D²)·（?）^-0.26854或n=（t/D）²·0.9932（?）^-0.26856更多还原

【Abstract】 The distribution of nymph-adult population of brown plant hopper （Nilaparvata lugens） in the initial stable-increasing stage fits negative binomial distribution, and egg population fits truncated negative binomial distribution （TNBD）. Theoretical sampling sizes models were obtained: For nymph-adult population,n=（1/D²） （1/（?）+1/2. 3584） or n=（t/D）² （1/（?） + 1/2. 3584）, n= theoretical sampling sizes, （?）=average of sample, D= allowable error, t=the value of t-distribution. For egg population, n=9.1777/（D²（x）） [1-P（1）] or n=（t/D）².（9.1777（x）） [1-P（1）], n=theoretical sampling sizes without zero, x=average of sampling without zero, P（I） frequency of one in the samples without zero. Theoretical sampling sizes models of nymph-adult population were obtained accordingtothe improving of IWAO’s （?）—M model and Taylor’s power law as following: n=1/D²（7.4820/（?）+0.11（?）-1.322）or n=（t/D）²（7.4820/（?）+0.11（?）-1.322）andn=0.9932/D² ·（?）^0.26854 or n=（t/D）². 0.9932（?）^0.26854.更多还原