Figure 1

Location and land use distribution of the study area in Helin County, northern China. Map created using ArcGIS 10.2 software (ESRI, Redlands, CA, USA) by the first author.
Location and land use distribution of the study area in Helin County, northern China. Map created using ArcGIS 10.2 software (ESRI, Redlands, CA, USA) by the first author.