Evaluating and improving soil water and salinity stress response functions for root water uptake

• DOI: 10.1016/j.agwat.2023.108451
• Publication Date: 2023-07-21T22:23:54Z
• Authors: Tianshu Wang; Yanqi Xu; Qiang Zuo; Jianchu Shi; Xun Wu; Lining Liu; Jiandong Sheng; Pingan Jiang; Alon Ben-Gal
• Keywords: HD9000-9495; Agriculture (General); Cross-adaptation effect; Relative transpiration rate; Cumulative effect; 04 agricultural and veterinary sciences; Agricultural industries; Root zone soil conditions; S1-972; Hysteresis effect; 0401 agriculture, forestry, and fisheries; Combined water-salinity stress

Many functions have been proposed to describe the response of root water uptake and/or salinity stresses. In practice, choosing a reliable stress function is challenging, particularly when and stresses occur simultaneously. To explore quantify effects soil conditions, separately combined, on uptake, two experiments culturing winter wheat in artificial climate chambers were conducted with various levels. As key index, plant status was evaluated by: a) considering relative position roots; b) rectifying estimation potential transpiration for stressed plants; c) excluding data during recovery periods dominated by hysteresis process historical stress; d) quantifying interaction between Including only one fitting parameter or thresholds clear physical meaning available recommendations, concave-convex could more accurately than others, leading rate (RMSE < 0.07, R2 > 0.91, MAE 0.24). Under combined water-salinity neither an additive nor multiplicative approach able accurately. addition cumulative effect, cross-adaptation effect exponential function, significantly improved water- salinity-stressed plants 0.08, 0.72, 0.28). Nevertheless, mechanisms underlying are still unclear should be further investigated. avoid stress, helpful, but its quantitative characterization also necessary accurate simulation studied.