The article discusses the research on the Yangtze River since 1950. It talks about where the sediment in the river comes from, how the river is changing in the middle and lower parts, and the importance of studying these changes for managing the river better. The researchers found that the sediment in the upper part of the river mainly comes from the Jinsha and Jialing rivers. They also discovered that both natural and human factors are affecting how the river is evolving, and that understanding these changes is crucial for planning river management projects effectively.