高寒草甸生态系统优势鼠种高原鼢鼠(Myospalax baileyi)和高原鼠兔(Ochotona curzoniae)种群空间格局的研究

本文研究于1983年7—8月,1985年8—10月期间,在中国科学院高寒草甸生态系统定位站进行。应用概率分布的方法研究小哺乳动物的种群空间格局,取得了与实际观察相吻合的结果。这项工作将为定量描述哺乳动物种群数量的空间配置做出尝试。 主要结果为: 1.高原鼢鼠和高原鼠兔(以下简称鼢鼠,鼠兔)的空间格局适合负二项分布,截尾负二项分布。 2.鼢鼠在空间的聚集强度高于鼠兔。 3.鼢鼠在高寒草甸和灌丛中的聚块面积分别为0.75公顷和1公顷以上;鼠兔均为0.5公顷。 4.大雪后(低密度鼠兔种群),鼠兔的空间格局呈随机分布,鼢鼠的格局不变,聚集强度均有下降。 5.两种动物空间分布总体上呈正相关,低密度样本与此相同;高密度样本为负相关。

THE RESEARCH ON THE POPULATION SPATIAL PATTERNS OF THE PLAETAU ZOKOR (MYOSPALAX BAILEYI) AND THE PLATEAU PIKA (OCHOTONA CURZONIAE) IN THE ALPINE MEADOW ECOSYSTEM

This research was carried out in Qinghai province from 1983 to 1985. The main results are as follows.1. The spatial patterns of the zokor and the pika fit the negative binomial and the truncated negative binomial distribution . 2. The assembling intensity of the zokor is higher than the pika. 3. The assembling area of the zokor is 0.75 ha in meadow and 1 ha in shrub, and that of the pika is 0.5 ha. 4. The spatial pattern of the pika shows its random distribution but the zokor's patten still shows the assembling distibution in low population density. The assembling intensity of the zokor and the pika is decreased in low density population following a heavy snow. 5. The spatial patterns of the zokor and the pika trend to positive correlation in the samples of low density but negative correlation in the samples of high density.