搜索结果: 1-2 共查到“人口社会学 on land”相关记录2条 . 查询时间(0.079 秒)
Humans have been working the land for millennia, cultivating plants or herding animals.Now researchers from Arizona State University are reporting on a 10-year project that studies the long-term effec...
Food Security, Fertility Differentials and Land Degradation in Sub-Saharan Africa：A Dynamic Framework
Food Security Fertility Differentials Land Degradation
2009/3/16
We study the impact of differential fertility levels for the food-insecure and food-secure population on the long-run values of the population distribution and resources in a descriptive model where t...