Fig. 7: The correlation relationship between runoff contribution volumes of sub-catchments, changes in runoff contributions caused by climate change and human activities, and factors such as air temperature, precipitation, potential evapotranspiration, population density, and various land use types.

The color and size of the circles represent the correlation coefficients between variables, with red indicating positive correlation and blue indicating negative correlation. Asterisks denote significance levels (* for p ≤ 0.05, ** for p ≤ 0.01, *** for p ≤ 0.001).