3.2.5. Proportion of Water Areas

WESV is largely determined by the water areas. The spatial distribution pattern of the proportion of water areas affecting WESV and the temporal change of this distribution pattern were analyzed (Figure 6). Looking at the entire study area, although the pattern distribution has changed, all coefficients showed that the proportion of water area has a positive impact on WESV. As shown in Figure 6c, the impact pattern in 2010 is that the degree of impact decreased from north to south. In 2015, the impact pattern evolved into that population density had the lowest impact on the southeastern region, and gradually increased in the west and north directions. In 2020, the gravity center of the impact continued to shift eastward, showing the phenomenon that the west was large and the east was small. The two counties with the least impact appeared in Shenmu and Fugu in the northeast, and these two districts and counties belonged to the most affected areas in 2010 and 2015.

**Figure 6.** Temporal and spatial distribution of the impact of Proportion of Water Areas on WESV in different years: (**a**) 2010; (**b**) 2015 and (**c**) 2020.

#### 3.2.6. Water Consumption

Water consumption is a key factor affecting the service value of Water Supply, and it is also the most direct manifestation of the ecological service value of water resources. Figure 7 exhibited the change in the spatiotemporal distribution of water consumption affecting the degree of WESV and showed that there is a positive correlation between water consumption and WESV. In 2010, the correlation coefficient between WESV and water consumption in the study area showed an increasing state from west to east. In 2015, the degree of influence showed a circular increase from the western to the eastern region (Figure 7b). The increase in the value range of the coefficient indicated that the differences between districts and counties were expanding. WESV in the southern region was gradually affected by changes in water consumption. With the passage of time, in 2020 (Figure 7c), the spatial distribution of WESV affected by water consumption had a strong regularity, decreasing in a stepwise manner from south to north. However, the coefficient ranges were less discrete.

**Figure 7.** Temporal and spatial distribution of the impact of Water Consumption on WESV in different years: (**a**) 2010; (**b**) 2015 and (**c**) 2020.

#### **4. Discussion**
