Research on the observation of condensed recharge in a water balance field of Urab Xinjiang province

In 1989-1995,observation were carried out at the unsaturated zone above the depth of 4m in a field of water balance with lysimeters in Urab，Xinjiang province.Result shows that the amount of condensed recharged significantly depended on the specific surface of mediums and hydraulic conductivity, cobble mixed gravel in 2.58mm/a,gravel in 3.15mm/a,middle sand in 9.90mm/a,fine sand in 35..87mm/a,silt in 10.04mm/a,the extrapolation volume of condensed water for silty sand and cohesive soil were 20 mm/a and less than 10 mm/a, the maximum volume was estimated as much as 50mm/a in mediums. The best period for condensed water formation in arid desert unsaturated zone was during April to September. we proposed that the account of groundwater resource are more than 3×1010m3/a in volume of in such region of Northwest China,which maybe greater than the infiltration of precipitation so, condensed water formed in unsaturated zone could be the crucial recharge resources in some certain arid areas. The article also deep analysized the observed data in the lysimeter.