Abstract During wetting-drying cycles, divergence is often found between the immediately improved soil water conditions after re-watering and the recovery of plant water status from stress, which ensues only gradually. Such an apparent hysteresis effect of water stress (HEWS) is usually neglected in simulating root-water-uptake (RWU) by empirical models. To consider HEWS in the empirical macroscopic RWU model of Feddes, a water stress recovery coefficient (δ) was introduced based on two lysimetric experiments under greenhouse and field conditions for winter wheat. The integrated effects of historical water stress events were investigated by assuming that the normalized influence weight of each past stress event declines with the increase of time interval before simulation as an exponential function of attenuation rate. Although δ could be described by an exponential function of an integrative index representing the general historical stress extent (R2 = 0.65, P

中文翻译：

---

将水分胁迫滞后引入 Feddes 经验宏观根吸水模型

摘要 在干湿循环过程中，复水后立即改善的土壤水分状况与植物水分状况从胁迫中恢复之间往往存在差异，这种差异只会逐渐发生。在通过经验模型模拟根系吸水 (RWU) 时，这种明显的水分胁迫 (HEWS) 滞后效应通常被忽略。为了在 Feddes 的经验宏观 RWU 模型中考虑 HEWS，基于冬小麦在温室和田间条件下的两个渗析实验引入了水分胁迫恢复系数 (δ)。通过假设每个过去压力事件的归一化影响权重随着模拟前时间间隔的增加而下降，作为衰减率的指数函数来研究历史水压力事件的综合影响。