Figure 5

The potential distributions for ESC in the United States, (a) under the historical climate, (b) under the future climate change scenario RCP 8.5 by the middle of 21st century, (c) under the future climate change scenario RCP 8.5 by the end of 21st century. Slash indicate the distribution areas of tree-of-heaven. Green points indicate the distribution locations of tree-of-heaven. White indicates unsuitable areas (EI = 0); Yellow indicates areas of marginal suitability (0 < EI ≤ 10); Orange indicates areas of moderate suitability (10 < EI ≤ 20); Red indicates areas of optimal suitability (EI ≥ 20). The map in this figure was generated by ArcGIS 10.1 (ESRI, Redlands, CA, USA, http://resources.arcgis.com/en/home/).