关键词: 达乌尔黄鼠, 空间分布型, 种群密度, 样方频率

Abstract: This paper is based on the investigation of lower mountain-hilly areas and plain areas in the northeast parts of Inner Mongolia in 1987．The comperative method of frequency distribution was used to study on the pattern of spatial distribution of Citellus dauricus．
The results show that the patterns of spatial distribution of mating stage and young seperating stage of Citellus dauricus belong poisson distribution in four investigating areas when the size of quadrat was 1 hectare(100m ×100m)．The effects of factors restricted by the enviroment and density on pattern of spatial distribution is not obvious． Regression analysis show that the curve relation between population density(m )and the quadrat frequency which the rodents were not captured(P_o,) or the quadrat frequency which the rodents were captured(P_x) were m =4.5451-0.9672lnP and m=4.5451-0.0672 in(1-P_x) respectively．The rasults of x ²-test show that the curves tally with the theoretical curve of poission distribution (x^2_《x^2_.0.05，df p>0.05)．These results will provide a theoretical basis for estimating the population density．

Key words: Citellus dauricus, Pattern of spatial distribution, Population density, Quadratfrequency