In the Zhicheng-Shashi reach, the value of the comprehensive connectivity function decreased slightly from 1967 to 1972, and the changes ranged from 0.72 to 0.85 (Fig. 8), which was caused by the river straightening of the Lower Jingjiang River. In the Shashi-Jianli reach, the value of the comprehensive connectivity function was approximately 0.85 before 1972, while the value showed an increasing trend from 1972 to 2002, and the changes ranged from 0.9 to 1.0 (Fig. 8).