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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.
Through the real-time monitoring of soil moisture in artificial greenland in the hinterland of Taklimakan Desert, the three-dimensional spatial and temporal variations of water content in the spatial range of 0-60 cm soil depth and 0-120 cm vertical in each irrigation cycle from April to July were studied. The results showed that the soil moisture of drip irrigation showed a periodic dynamic law under drip irrigation, and no obvious difference was observed when rainfall was ignored. The temporal and spatial variations of soil moisture under non-rainfall and rainfall conditions were significantly different. The soil water content was high in April, low in July and the highest in June with obvious rainfall. The variation characteristics of soil moisture on different time scales were different, but the overall change with the month (April-July) showed a downward trend, The diurnal variation (from 1 to 15 days) showed a power law decreasing rule, and experienced three different stages during the cycle. The soil water showed a linear decrease in horizontal distance and bimodal curve in vertical space, And there is a significant peak at 20 cm soil layer. The spatial distribution of soil moisture is dependent on the physical properties of the soil itself.