Influence of Intermittent Water Deliveries on the Hydrochemistry of Soil in the Lower Tarim River

Based on the data of the groundwater buried depths,the chemical properties,salinity in soil profile and the basic information on each delivery of water collected from the year 2000 to 2006,the variational characteristics of groundwater chemistry and related factors were studied. The results confirmed the three stages of the variations in groundwater chemistry influenced by the intermittent water deliveries. The factors which had close relationships with the variations in groundwater chemistry included the distances of monitoring wells from water channel,the depths of groundwater,water flux in watercourse and the salinities in soils. The relationships between chemical variations and groundwater depths indicated that the water quality was the best with the groundwater ranging from 5 to 6 m. In addition,the constructive species in the study area can survive well with the depth of groundwater varying from 5 to 6 m,so the rational depth of groundwater in the lower Tarim River should be 5-6 m.