Relationship between root water uptake and soil respiration: A modeling perspective

Teodosio, Bertrand; Pauwels, Valentijn R. N.; Loheide, Steven P.; Daly, Edoardo

doi:10.1002/2017jg003831

Cited by 20 publications

(12 citation statements)

References 64 publications

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“…Phreatophytes are adapted to these natural fluctuations in groundwater levels by developing a certain root architecture (Gasry, ; Sprackling & Read, ). For example, a dimorphic root system as observed in this study and others (David et al, ; Prieto, Kikvidze, & Pugnaire, ) allows phreatophytes to use different sources of water (Doody et al, ; Weltzin & Tissue, ), and this type of root distribution enables root water compensation from different depth of soil depending on moisture availability (Teodosio, Pauwels, Loheide, & Daly, ; Verma, Loheide, Eamus, & Daly, ).…”

Section: Discussionsupporting

confidence: 58%

Response of phreatophytes to short‐term groundwater pumping in a semiarid region: Field experiments and numerical simulations

Yin

Zhou

et al. 2018

Ecohydrology

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Balancing the water demand between human usage and ecosystems remains a challenge in water‐limited regions where one of the main groundwater uses is short‐term pumping. A 23‐day pumping test was performed in a semiarid site of north‐west China to test the hypothesis that native phreatophytes can tolerate short‐term pumping. The monitoring indicated that sap flow velocity of groundwater‐dependent willow trees began to decrease on Day 4 after pumping and almost fully recovered on Day 9 after the cessation of pumping. Numerical simulations using HYDRUS‐1D were conducted for the period of 1954–2013 to assess the response of phreatophytes to groundwater withdrawal under various climatic conditions. The modelling results reveal that phreatophytes can recover from the stress induced by groundwater pumping because they can adapt to short periods of water stress using physiological and morphological traits and the degree of water stress depends on the amount and/or frequency of rainfall during and after pumping. Therefore, pulsed pumping, under particular climatic conditions, could be used to reduce negative impacts of groundwater extraction on phreatophytes, while still providing groundwater for socio‐economic activities in semiarid zones.

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Section: Discussionsupporting

confidence: 58%

Response of phreatophytes to short‐term groundwater pumping in a semiarid region: Field experiments and numerical simulations

Yin

Zhou

et al. 2018

Ecohydrology

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“…Porous-media models combine the continuity equation with the Darcy's law to define partial differential equations for the dynamics of the water potential across the SPAC. Some applications of these models focus on the water fluxes within the plant architecture (Kumagai, 2001;Bohrer et al, 2005;Chuang et al, 2006;Janott et al, 2011), others are centred on processes below-ground and the interaction between soil and roots (Somma et al, 1998;Mendel et al, 2002;Amenu and Kumar, 2007;Teodosio et al, 2017), with more recent applications looking at the whole SPAC system (Verma et al, 2014;Quijano and Kumar, 2015;Mirfenderesgi et al, 2016Mirfenderesgi et al, , 2018. Although more complex than electrical circuit models, porous-media models are able to simulate a larger variety of processes, such as root water compensation and hydraulic redistribution (Verma et al, 2014), and account for the transient response of water potential along the SPAC system.…”

Section: Introductionmentioning

confidence: 99%

Tree Hydrodynamic Modelling of Soil Plant Atmosphere Continuum (SPAC-3Hpy)

Silva

Matheny

Pauwels

et al. 2021

Preprint

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Abstract. Modelling the water transport along the soil-plant-atmosphere continuum is fundamental to estimating and predicting transpiration fluxes. A tree-hydrodynamic model (SPAC-3Hpy) for the water fluxes across the soil-plant-atmosphere continuum is presented here. The model combines the water transport pathways to one vertical dimension, and assumes that the water flow through the soil, roots, and above-ground xylem can be approximated as a flow in porous media. This results in a system of three partial differential equations resembling the Richardson-Richards equation describing the transport of water through the plant system and with additional terms representing sinks and sources for the transfer of water from to the soil to the roots and from the leaves to the atmosphere. The numerical scheme, developed in Python 3, was tested against exact analytical solutions for steady state and transient conditions using simplified but realistic model parametrizations. The model was also used to simulate a previously published case study where observed transpiration rates were available in order to evaluate model performance. With the same model setup as the published case study, SPAC-3Hpy results were in agreement with observations. Through a rigorous coupling of soil, roots, and hydroactive xylem, SPAC-3Hpy can account for variable capacitance while conserving mass and the continuity of the water potential between these three layers. SPAC-3Hpy provides a ready-to-use open access numerical model for the simulation of water fluxes across the soil-plant-atmosphere continuum.

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“…As reviewed by Heinen (2014), both physicallybased mechanistic (Doussan et al 1998;De Jong van Lier et al 2008;Couvreur et al 2012) and empirical (Feddes et al 1978;Vrugt et al 2001) models have been utilized extensively to delineate root water uptake (RWU) processes. Limited by complicated or difficult to obtain parameters such as root morphology and hydraulic properties (Peters 2015;Teodosio et al 2017), the physically-based mechanistic models are not commonly used in practice. The empirical models are more readily employed because of their relative simplicity and fewer data requirements.…”

Section: Introductionmentioning

confidence: 99%

Parameterization of the water stress reduction function based on soil–plant water relations

Shi

Zuo

et al. 2020

Irrig Sci

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Rational parameterization of the soil water stress reduction function in root water uptake model is crucial for accurate description of root water uptake and simulation of soil water dynamics in a soil-plant system. In this study, we propose three improvements to a popular transpiration-based approach to parameterize the water stress reduction function in a widely used macroscopic root water uptake model. The improvements are based on the interdependent relationships between soil and plant water status and consideration of effects of (1) relative distribution of soil water to roots on transpiration; (2) differences in growth levels of plants exposed to different levels of water stresses on potential transpiration; and (3) hysteresis of water stress on parameter optimization through identifying and discarding the data involved in the recovery periods when the discrepancy between soil and plant water availability is significant. Lysimetric experiments with winter wheat planted alternatively in greenhouse soil columns and in a field were conducted to test the proposed improvements. Through minimizing the residuals between the measured and estimated actual transpiration, the optimized parameterization was used to set up the root water uptake model. Thereupon, actual transpiration and relative transpiration were estimated and soil water content distributions were simulated. The estimated actual (RMSE ≤ 0.09 cm day −1 ) and relative (RMSE = 0.06) transpiration agreed well with the measurements. The simulated soil water content distributions also matched the measured values well for both experiments (RMSE ≤ 0.023 cm 3 cm −3 ). Omitting any of the three proposed improvements reduced the estimation accuracy of relative transpiration, as the individual contribution ratio for each improvement was between 21.2 and 51.2%. The improvements should be reasonable in providing rational parameter estimation for the water stress reduction function, from which root water uptake models can be established to accurately evaluate plant transpiration and simulate soil water flow in a soil-plant system. The parameterization strategy for the water stress reduction function of root water uptake not only benefits accurate evaluation of plant transpiration under drought conditions but also contributes to further study and description regarding the apparent hysteresis of root water uptake after re-watering.

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Relationship between root water uptake and soil respiration: A modeling perspective

Cited by 20 publications

References 64 publications

Response of phreatophytes to short‐term groundwater pumping in a semiarid region: Field experiments and numerical simulations

Response of phreatophytes to short‐term groundwater pumping in a semiarid region: Field experiments and numerical simulations

Tree Hydrodynamic Modelling of Soil Plant Atmosphere Continuum (SPAC-3Hpy)

Parameterization of the water stress reduction function based on soil–plant water relations

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