北美CHIHUAHUAN荒漠啮齿动物群落动态III．变量的频次分布和预测

本文用х²方和柯尔莫哥洛夫检验分析了北美Chihuahuan荒漠啮齿动物群落6个生态学变量的频次分布，并用移动平均和指数平滑方法拟合了这些变量的动态变化。结果显示：1)结合种群密度、生物量、物种均匀性和生物量均匀性服从正态分布；2)物种数和物种多样性的频次为向右偏斜的分布，无法用常见的理论分布来近似表示；3)单移动平均和双移动平均分别较好地描述了物种多样性和物种均匀性；4)其余4个变量可用单指数平滑来较好的描述．

DYNAMICS 0F THE RODENT COMMUNITY IN THE CHIHUAHUAN DESERT 0F N0RTH AMERICA

The frequency distributions of the 6 ecological variables of the rodent community in the Chihuahuan Desert of southwestern North America were verified using the chi-square test and Kormorgorov test．And moving averages and exponential smoothing methods were employed to predict dynamics of the 6 community variables．The results reveal that: 1)joint population density，biomass.species evenness and biomassevenness had a normal distribution;2) frequency distribution of number and diversity of species was skewed to the right(skewness<0)，no common theoretical probability distribution could describe these two variables;3)single moving averages was a better model for predicting fluctuations of species diversity and double moving averages for that of species evenness;4)Single exponential smoothing fitted dynamics of the other variables wel1．