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XL Xiaolin Li
XZ Xiaotao Zhang
JN Jun Niu
LT Ling Tong
SK Shaozhong Kang
TD Taisheng Du
SL Sien Li
RD Risheng Ding
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The Hexi Corridor is located in the arid region of Northwest China (92°12′ E-104°20′ E, 37°17′-42°48′ N), with the total area of 270,000 km2 and the distance from east to west about 1,000 km (Fig. 1). There are three river systems, Shiyang River, Hei River, and Shule River, from east to west29. It is an important agricultural production base of Northwest China, with abundant land, light and heat resources. The climate exhibits typical arid features30, with annual mean precipitation of 50–150 mm and annual mean evaporation of 1500–2500 mm. Agricultural production in this region highly relies on irrigation.

The map was developed through using ArcGIS 10.0 (http://www.esri.com/software/arcgis/arcgis-for-desktop).

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