Spatio-Temporal Variations of Population Distribution and Population Concentration & Decentralization With Data at County Level in Recent 60 Years in Shandong Province

This paper selected the commonly used indexes such as Lorenz curve,Gini coefficient and population density,and then introduced Population concentration decentralization and population stability on the basis of population density to study the variation of the temporal and spatial distribution of the population in Shandong province in recent 60 years.The results showed that:(1) the population distribution in Shandong province maintained a more balanced situation,but the Gini coefficien thas gradually increased especially from 1982,population continued to focus on urban area and economic center;(2) The spatial distribution of population density fundamentally constrained by the natural environment or some natural laws,as a result populaiton density showed the pattern of Southwest-Northeast changing with the natural conditions,gradually reduced from southwest to northeast,and furthermore showed a high-high and low-low association distribution pattern;(3) The spatial distribution of population would continue to strengthen.Before 1982 almost each county had a general increase in population,but after 1982 the increased and decreasesd trend became common.County population distribution has remained relatively stable before 1982,but population inflow/outflow increased frequently since 1982,and the impact was getting more widely;(4) The reform and opening-up policy was a turning point of the changing patterns of population distributionin Shandong Province.Since the national and regional development policy has changed dramatically,regional disparity became a major cause of lead to changes in population distribution,and urbanization became the powerful thrust of population movements,all of these promoted the re-distribution of the population greatly.