The soil AWC of arid soil area ofnorthwest of China and that of high and frigid soil area of southwest of China mostly range from 12% to 21.2%, and secondly rang from 12% to 15% in the two areas. .

• 西北干旱土壤区域以及西南高寒土壤区域的土壤AWC主要分布在12.；0-21