Relationship between oases distribution and stream runoff in the Tarim Basin

Oases in the Tarim basin were extracted using 2007 SPOT NDVI dataset.It was concluded that oases in the Tarim Basin cover an area of 54923.86 km2,making up about 10% of the entire basin;oases and desert steppe together occupy an area of 101392.56 km2,making up about 18% of the of the entire basin.The extracted oases were divided into 17 watershed-based areas by applying Distance Analysis in ArcGIS package.The relationship between the runoff and the oasis area within a watershed-based area was assessed and a significant correlation was found between the magnitude of runoff and the area of oasis.