Abstract: The productivity of the root vole (Microtus 0economus) population in the Haibei a1pine meadow ecosystem of Qinghai was studied．The catch-mark-releas(CMR) method was used in field works for three years (1980- 1982)，the net production of the root vole population was estimated with individual turnover rate, reproductive growth production (Pr+Pg)and growth survival Curve on two plots． The article emphatically analyses dynamics of the population production during three years and some important ecological efficiencies are shown：there wasno much difference in the productions that were obrained by the three methods．but there were great annual variations; the production was proportional to individual-days．average density and humor of newborns，the value Pg/P related with the mean longevity and population density，about 81% of the total was made by the nontrappable animals(nestlings and suckings)，the reproductive production (Pr) was low during May，high during June，and dropped during July．

Key words: Micrtotus oeconomus, Production, Population density, Reproduction, Growth—survival, Individual-dayss

摘要： 本文探讨了青海海北高寒草甸生态系统中根母鼠种群的生产力。野外工作采用标志重捕法(CMR)，利用个体周转率(n)，繁殖-生长生产量(P=Pr+Pg )和生长-存活曲线估算了两块样地上根田鼠种群1980-1982年3年间的生产量。根田鼠种群生产量的年间动态和重要的生态效应有：3种方法算得的各年生产量与个体日、平均密度及新生个体数成正比例，比值P_g／p与生态命、密度等有关；可捕年龄前动物的生产量在总量中所占比例很大(达8l% )；繁殖生产量P_r的季节动态表观为5月低、6月高、7月下降的倒“V”字型。

关键词: 根田鼠, 生产量, 种群密度, 繁殖, 生长-存活, 个体日