新研究揭示长江下游史前社会人口存在约500年波动周期

Core Insights - The research conducted by the Chinese Academy of Sciences reveals a clear cyclical pattern in population dynamics in the lower Yangtze River region over the past 10,000 to 3,000 years, driven by changes in the East Asian summer monsoon and environmental shifts [1][2] Group 1: Population Dynamics - The study analyzed carbon-14 dating data from 1,008 archaeological sites, establishing a high-precision population dynamic model that shows significant cycles of population expansion and contraction, with an average interval of approximately 500 years [1] - Fourteen distinct population peaks were identified between 9,700 and 3,000 years ago, with notable peaks around 7,200, 5,200, and 4,300 years ago [1] Group 2: Environmental Influence - The East Asian summer monsoon exhibits a "seesaw" effect on precipitation between northern and southern China, where a weakening of the summer monsoon leads to increased rainfall in the lower Yangtze region, enhancing agricultural productivity and supporting population growth [2] - Conversely, when the summer monsoon strengthens and reduces local precipitation, resource pressure increases, leading to a contraction in population size [2] Group 3: Societal Resilience - A significant finding indicates that between 7,800 and 5,500 years ago, despite climatic fluctuations, the population did not experience drastic changes, suggesting a notable increase in societal resilience during this period [2] - This resilience provides valuable historical insights into the relationship between civilization dynamics and environmental changes, particularly relevant in the context of contemporary global climate change and sustainable development [2]