Fig 1.
Theoretical framework of this paper.
Fig 2.
Geographical location of the study area.
Table 1.
The evaluation index system of NTU.
Table 2.
The evaluation index system of RR.
Table 3.
Variable setting and descriptive statistical results of factors influencing CCD.
Fig 3.
Changes of NTU and RR indexes from 2011 to 2022.
Fig 4.
Spatial evolution of NTU in the YREB, 2011, 2015, 2019, 2022.
Fig 5.
Spatial evolution of RR in the YREB, 2011, 2015, 2019, 2022.
Fig 6.
The RDD between NTU and RR, 2011, 2015, 2019, 2022.
Fig 7.
The CCD between NTU and RR, 2011, 2015, 2019, 2022.
Fig 8.
Regional differences of the CCD.
Fig 9.
YREB’s kernel density curve of CCD.
Table 4.
Results of the analysis of factors affecting the CCD.