数理统计法初步分析江汉平原裸藻门植物的分布

A PRELIMINARY STATISTICAL ANALYSIS ON DISTRIBUTION OF EUGLENOPHYTA IN THE JIANGHAN PLAIN HUBEI. CHINA

裸藻门植物在江汉平原分布的特点是:分布广泛,出现机率高,达96.4％;用方差分析法,检测各采集点浮游生物标本中裸藻门植物种类丰度在平原各地随机分布的差异程度,其结果是无显著的区域性差异;水体中裸藻门植物种类丰度的频数分布近似于一正态曲线,这反映了大多数水体中裸藻类的种类丰度较大;相同频数的种类数与其出现频数的相关性呈明显的幂函数关系,显示了只有少数非常普生的裸藻门种类在区内广泛分布。

The distribution charecteristics of Euglenophyta in the Jianghan Plain are summarized as follows: 1. The euglenoid distribution is extensive and the probability of euglenoid appearance is as high as 96.4％. 2. Analysis of variance showed no significant differences in euglenoid species abundance in the plankton samples collected from different localities [F=1.01<F_(0.05)=2.41,df=(5,48), p>0.05]. 3. The frequency distribution of euglenoid species abundance in water bodies is similar to a normal distribution (mean: μ=9.8; standard deviation:σ=5.2;X_2 test: 0.10>P>0.05, df=3). The euglenoid species number in most water bodiesfalls within range 6—14. 4. The relationship between the euglenoid species number (N) and occurrence frequency (F) can be described by a power function: N=70.600F^(-1.437)(r=-0.961, n=18, p<0.001) This relationship suggests that only a small number of common species have wide distributions in the Jianghan Plain.