Table 6: Monthly runoff changes of natural and human activity periods in the four sub-basins (108 m3).

Sub-basin Natural period Human activity period
Land use change Climate change Other human activities  
(%) (%) (%)

Shuntian 1.12 1.16 0.04 0.08 24.11 −0.15 44.60 0.11 31.29
Yuecheng 0.55 0.53 −0.01 0.03 19.54 −0.08 54.74 0.04 25.72
Lantang 0.73 0.77 0.03 0.05 29.94 −0.07 40.51 0.05 29.55
Jiuzhou 0.34 0.34 −0.01 0.02 25.50 −0.05 53.22 0.02 21.27