中文摘要：

通过对咸水滴灌下塔克拉玛干沙漠腹地人工绿地的土壤水分进行实时监测,研究了4—7月各灌水周期内土壤水平0-60 cm和垂直0-120 cm空间距离范围内的水分三维时空变化.结果表明：咸水滴灌下绿地土壤水分表现出周期性的动态规律,且在忽略降雨时,这种规律随时间变化未表现出明显差异;非降雨与降雨条件下的土壤水分时空变化差异显著.土壤含水量在4月偏高,7月偏低,在有明显降雨的6月最高;土壤水分在不同时间尺度上的变化特征不同,但整体随月变化（4—7月）呈下降趋势,随日变化（1-15 d）呈幂函数递减规律,且在周期内先后经历3个不同变化阶段.土壤水分在水平空间距离上呈一元线性递减,在垂直空间上近似表现为双峰曲线,且在20 cm土层处有一个显著峰值;土壤水分空间分布特征取决于土壤自身的物理性质.

英文摘要：

Three-dimension temporal and spatial dynamics of the soil water characteristics during four irrigating cycles of months from April to July for the artificial vegetation in the center of Taklimakan Desert under saline water drip-irrigation had been analyzed by timely measuring the soil water content in horizontal and vertical distances 60 cm and 120 cm away from the irrigating drips,respectively. Periodic spatial and temporal variations of soil water content were observed. When the precipitation effect was not considered,there were no significant differences in the characteristics of soil water among the irrigation intervals in different months,while discrepancies were obvious in the temporal and spatial changes of soil moisture content under the conditions of rainfall and non-rainfall. When it referred to the temporal changes of soil water,it was a little higher in April but a bit lower in July,and the soil water content in June was the highest among four months because some remarkable events of precipitation happened in this month. However,as a whole,the content of soil moisture was reduced as months（ from April to July） went on and it took a decreasing tendency along with days（ 1-15 d） following a power function. Meanwhile,the characteristics of soil water content displayed three changeable stages in an irrigation interval. When it referred to the spatial distributions of soil water,the average content of soil moisture was reduced along with the horizontal distance following a linear regression function,and varied with double peaks along with the vertical distance. In addition,the spatial distribution characteristics of the soil water were not influenced by the factors of precipitation and irrigating time but the physical properties of soil.