【摘要】 本文通过聚集度指标测定,Iwao’s M*,x线性回归和Taylor’s幂的法则分析,结果表明:花生田内蜗牛(Bradybaena Similaris Ferussac)的空间格局里聚集型,其基本成分是个体群,且聚集度随种群密度增减而升降。经方差分析和u测验,表明双对角线五点式、平行跳跃式、棋盘式和“Z”字式等取样方法均适用于花生田内蜗牛的调查,且以棋盘式为最佳.用棋盘式取样法调查的样本数可以少至30穴。更多还原

【Abstract】 The results obtained by measurement of the indices of aggregation intensity(iaduding:CA.M* x,L/1+x)and analysis of the Iwao’s M*-x regression and the Taylor’s power rules showed that the spatial distribution pattern of Bradybaena similaris Ferassae(1821)in peanut fields was aggregation distribu-tion(CA>0,M*/x>1 and M*=0.14598+1.39095x,r=0.9955***,P<0.001)The basic composition of the distribution was individual group(α>0,β>1).And the aggregation degree increased(or decreased)with increase(or decrease)in the population density(S2=1.73401 x1.23158,r=0.9967***,P0.001;a>1,b>1).The results of analysis of variance and test of u showed that the all methods of sampling(Diagonal of five points.Paralled,Scattering and "Z" way)were suitable for the investigation o.f Bradybaena similaris Ferussac(1881)in peanut fields.Of them the scattering pattern was the best.The sample numbers by the scattering pattern might be less than 30.更多还原