## 3 Results
### The Assessment of ESEV and ESV
 & **Total** \\ \hline
2004 ESEV & 703.39 & 380.09 & 11.14 & 1337.99 & 0.97 & 3916.73 & 1462.27 & 7812.58 \\
2010 ESV & 1274.04 & 958.85 & 221.74 & 1140.3 & 11.52 & 5793.28 & 4045.69 & 13,445.42 \\
2016 ESV & 146.1 & 1185.39 & 220.14 & 1307.12 & 17.6 & 7949.85 & 5536.73 & 17,682.93 \\
2004–2010 & 570.65 & 578.76 & 210.6 & \(-\)197.69 & 10.55 & 1876.55 & 2583.42 & 5632.84 \\ \multicolumn{2}{c}{ \begin{tabular}{c} \end{tabular}  } \\ \cline{2-2}
2010–2016 & 192.06 & 226.54 & \(-\)1.6 & 166.82 & 6.08 & 2156.57 & 1491.04 & 4237.51 \\ Change & \multirow{2}{*}{\(-\)0.72} & \multirow{2}{*}{14.63} & \multirow{2}{*}{52.78} & \multirow{2}{*}{37.23} & \multirow{2}{*}{36.86} & \multirow{2}{*}{31.52} \\ Change & & & & & & & & \\ \cline{2-2}
2004–2016 & 762.71 & 805.3 & 209 & \(-\)30.87 & 16.63 & 4033.12 & 4074.46 & 9870.35 \\ Changearea and the ESEV coefficients of the water ecosystem were far greater than the ESEV losses from the decrease in river area, the increase in ecological land with a high service capacity, such as forest and grassland, could not offset the loss of ESEV caused by the large reduction in cropland and orchard area. Because of the high ESEV coefficients and the large area, the ecosystem services supplied by rivers and wetlands and lakes were the highest among the eight land use categories, accounting for approximately 70% of the total ESEV. The ESEV coefficients of cropland and orchard were relatively low, and their area continued to decrease, resulting in a decrease in the ESEV share from 26% to approximately 15%. Although forests and grasslands had high ESEV coefficients and large area growth, due to the small area base, their ecosystem service capacity was relatively limited, and their role in ecosystems was increasingly important. Combining Tables 7 and 8, the total ESV of the study area was approximately 7.81 billion yuan in 2004, 13.45 billion yuan in 2010 and 17.68 billion yuan in 2016. During the 12-year study period, the ESV in the study area increased by 126.34%, with an increase of 72.1% in 2004-2010 and 31.52% in 2010-2016. The ESVs of cropland, forest, unused and other, river, and wetland increased by different degrees during the 12-year study period. The ESV of grassland increased explosively with the increase in area and the ESEV coefficients during 2004-2010 and decreased slightly by 0.72% during 2010-2016 due to decreases in area and ESEV coefficients. However, the overall growth rate was still as high as 1876.12% during the whole study period, which was the highest among the seven types of ecological land. The orchard area continued to decrease, and its ESV decreased by 14.78% during 2004-2010. Despite the increase in the standard value volume of the ESEV between 2010 and 2016, the ESV of orchards decreased by a net of 2.31% throughout the period, which was the only ecological land type with a net decrease in ESV. Despite the changes in natural conditions and the process of urbanization, the reduction in ecological land may have resulted in a decline in ecosystem services. However, with the increasing value of ESEV standards promoted by socioeconomic development, the total ESV in the study area still had a large increase after offsetting the ESV losses caused by ecological background quality changes and the area reduction of ecological land.