静止人口是一个总人口数长期保持不变(既不增加也不减少)的人口,即每年出生人口数与死亡人口数总是相等的人口。静止人口和稳定人口都假定是封闭人口,没有发生人口迁移现象。静止人口有一个重要特性就是出生率等于死亡率,并且与平均预期寿命成倒数关系。原始社会的人口接近于静止人口,近代有些国家(如欧洲一些国家)也接近于静止人口。
替换率——用来协调静止人口的总出生率级别。
Replacement rate — The level of total fertility that is compatible with a stationary population.
从对热点人口的分析来看,非洲板块似乎是静止的,在过去的3000万年里它没有移动过。
From an analysis of the hot-spot population it appears that the African plate is stationary and that it has not moved during the past 30 million years.
从对热点人口的分析来看,非洲板块似乎是静止的,在过去的3000万年里它没有移动过。
From an analysis of the hot-spot population it appears that the African plate is stationary and that it has not moved during the past 30 million years.
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