Soil moisture is of high variability both in space and time, and root growth may greatly alter the soil texture and lead to distinctive moisture patterns. In order to explore the spatiotemporal variability of rooted soil moisture, this study conducted a series of greenhouse tomato growth experiments using loess and under certain irrigation regimes. The experiment lasted for three months, and throughout the growth period, root lengths and hourly moisture values of different positions in the root zone soil were measured. It is found that the root length satisfies the Weibull distribution and the parameters are well related to the weight and area of the root system. As root grows, soil structure changes dramatically and becomes highly heterogeneous, then the moisture presents distinctive patterns, falling into subareas of high, middle, and low moisture levels. The patterns vary remarkably in the three growth stages (growing, developing, and maturation), and the subareas approach to a balance state at the end of growth. Furthermore, from the spatial moisture patterns one may derive the root-affected water routines, which approaches to a uniform moisture in the zone far away from the root. Finally, the spectrum analysis of the moisture series at hour scale indicated that the moisture in near root area bears a weak persistence character, responding to the rainfall (or irrigation) fluctuation, while the moisture in area distant to root system bears high persistence character, having power exponent similar to slope soils in general and hence representing the ordinary state of soil moisture. In summary, the findings of spatial moisture patterns and temporal spectrum exponents are expected to be heuristic for understanding the spatiotemporal variability of soil moistures in general.

土壤水分在空间和时间上都有很大的变化，根系的生长可能极大地改变土壤质地并导致独特的水分分布。为了探究生根土壤水分的时空变化，本研究在一定灌溉条件下使用黄土进行了一系列温室番茄生长试验。实验持续了三个月，在整个生长期中，测量了根区土壤中不同位置的根长和每小时水分含量。发现根长满足魏布尔分布，并且参数与根系的重量和面积良好相关。随着根的生长，土壤结构发生巨大变化并变得高度异质，然后水分呈现出独特的模式，并落入高，中，水分含量低。在三个生长阶段（生长，发育和成熟），模式发生了显着变化，并且在生长结束时，子区域接近平衡状态。此外，从空间水分模式中可以得出根系受水影响的例程，该过程在远离根系的区域中达到均匀的水分。最后，小时尺度上的水分序列的频谱分析表明，根部附近的水分具有弱的持久性，对降雨（或灌溉）波动有响应，而远离根系的水分具有高的持久性，通常具有类似于斜坡土壤的幂指数，因此代表土壤水分的普通状态。综上所述，