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以湖南道口县(艹那)溪瑶族乡调查资料为例。其人口困境之一:“两种生产”即人口生产与国民经济生产比例严重失调。从1990年7月第四次人口普查看,(艹那)溪乡已从1951年的总人口4265人增加到10027人,共增长两倍,而耕地却从农业人口的人均耕地1.6亩减至0.8亩,减去了一倍;粮食亩产虽然已从121公斤增至550公斤,但粮食增长的速度远不如人口增长的速度快;全乡人口年平均递增175人,而森林资源每年减少1.6万立方米。全乡17个村近50％的村组原始森林基本砍光,柴草奇缺。由于森林从“昔日青山满园”变成“如今荒山秃岭”,造成水土流失严重,常引起洪涝灾害。困境之二是人口增长长期失控。大体形成
Take the survey data of Yao Nationality in Xikou County of Hunan Province (艹 那) for example. One of its population dilemmas: “two kinds of production” means that the ratio of population production to the production of the national economy is seriously imbalanced. According to the Fourth Census of July 1990, the population of the township of Xizang has doubled from 4265 in 1951 to 10,027 in total, while the cultivated land has been reduced from 1.6 mu per capita of the agricultural population to 0.8 mu, which is doubled. Although grain yield has risen from 121 kilograms to 550 kilograms, the grain growth rate is far less than the population growth rate. The average annual population of the township increases by 175 people, while the forest resources decrease by 1.6 Ten thousand cubic meters. Nearly 50% of the villages in 17 villages in the township are basically chopped out of primary forests, and firewood is scarce. Due to the change of the forest from “Old Castle Peak” to “Bald Ridge nowadays,” serious soil erosion has caused frequent floods and floods. The second predicament is the long-term population growth out of control. Generally formed