Abstract Soil infiltration is an inevitable process of the mutual transformation of surface water and groundwater in the ecological hydrologic cycle that helps to transport nutrients required by plants to the root system, thus promoting vegetation growth and maintaining ecological stability. It is of utmost importance to simulate the process of soil infiltration and calculate the key parameters of soil water migration accurately. Yet, a scale effect in the determination of soil infiltration can seldom be avoided. Based on the scale effect law caused by a change in the inner-ring diameter of the double-ring infiltrometer and common infiltration models, empirical models of soil infiltration scale transfer (SIST) are proposed and established to improve the simulation accuracy of the steady infiltration rate, while reducing test difficulty and consumption. The results show that the four SIST models established based on the infiltration models well simulate the infiltration process of five different sizes of double-ring infiltrometers. The simulation Adj-R2 of the three infiltration zones in the study area was between 0.66 and 0.95, and the validation Adj-R2 ranged from 0.72 to 0.94, indicating that the SIST models showed good applicability in the investigated semi-arid grassland. The results further showed that the double-ring infiltrometer with an inner-ring diameter larger than 90 cm and an outer ring buffer coefficient of 0.33 was not accompanied by the scale effect during measurement. Moreover, the SIST models were used to predict the steady infiltration rate in the study area, providing an accurate data basis for the establishment of regional eco-hydrological models.

中文翻译：

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半干旱草地盆地板栗土壤入渗的尺度传递与模拟

摘要 土壤入渗是生态水文循环中地表水和地下水相互转化的必然过程，有助于将植物所需的养分输送到根系，从而促进植被生长，维持生态稳定。模拟土壤入渗过程，准确计算土壤水分迁移的关键参数至关重要。然而，在确定土壤入渗方面的规模效应很少能避免。基于双环入渗仪内环直径变化引起的尺度效应规律和常用入渗模型，提出并建立土壤入渗尺度传递（SIST）经验模型，提高稳态入渗模拟精度。速度，同时降低测试难度和消耗。结果表明，基于渗透模型建立的四种SIST模型较好地模拟了五种不同尺寸的双环渗透仪的渗透过程。研究区3个入渗带的模拟Adj-R2在0.66~0.95之间，验证Adj-R2在0.72~0.94之间，表明SIST模型在所调查的半干旱草地具有良好的适用性。结果进一步表明，内环直径大于90 cm、外环缓冲系数为0.33的双环渗透仪在测量过程中不伴随尺度效应。此外，SIST 模型用于预测研究区的稳定入渗速率，