Figure 1

Distribution map of experimental stations (50 test sites). This figure was generated by ArcGIS software (version 10.1; http://support.esrichina-bj.cn/2013/0128/1677.html).

Distribution map of experimental stations (50 test sites). This figure was generated by ArcGIS software (version 10.1; http://support.esrichina-bj.cn/2013/0128/1677.html).