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长江流域总人口,1949年末为19,000多万,到1987年已发展到37,700多万。38年间增长95.95％,平均每年增加486万人,平均每年递增率为18.2％。人口密度由1949年106.4人/km~2增加到1987年208.6人/km~2。现就长江流域人口的生态地理分布及其发展变化的原因分析如后:一、人口的生态地理分布长江流域人口分布具有如下特点:①按三大经济地带分,中部和近西部人口比重大,东部和远西部人口比重小;②平原河谷、丘陵地区人口比重大,山地、高原地区人口比重小,海拔200～1000m高度内人口
The total population of the Yangtze River valley, at the end of 1949, was over 190 million and by 1987 it had grown to over 377 million. 38.95 years of increase of 95.95%, an average annual increase of 4.86 million people, the average annual rate of increase of 18.2%. Population density increased from 106.4 persons / km ~ 2 in 1949 to 208.6 persons / km ~ 2 in 1987. The ecological and geographical distribution of the population in the Yangtze River Basin and its causes are analyzed as follows: I. Ecological and Geographical Distribution of Population The population distribution in the Yangtze River Basin has the following characteristics: ① According to the three major economic zones, the proportion of the population in the central and western regions is large, The proportion of the population in the east and the far west is small; (2) the proportion of the population in the plain valley and hilly area is large, the proportion of the population in the mountainous and plateau areas is small, and the population within the altitude of 200-1000m