Fig. 1

Location of study area and distribution of soil sampling sites (created using ArcGIS 10.7, https://www.esri.com, based on the standard map (GS2019(1822)). RV: Rose Valley; PGG: Purple Gold Garden; PCS: People’s Cultural Square; JCP: Jinchuan Park; JCMP: Jinchuan Mining Park; LQP: Longquan Park; JSLWP: Jinshui Lake Wetland Park.