[1798] - Root growth, water uptake, and sap flow of winter wheat in response to different soil water conditions

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Citation
Cai, G., Vanderborght, J., Langensiepen, M., Schnepf, A., Vereecken, H., 2018. Root growth, water uptake, and sap flow of winter wheat in response to different soil water conditions. Hydrology and Earth System Sciences, 2449 - 2470.
Identification
Title(s):Main Title: Root growth, water uptake, and sap flow of winter wheat in response to different soil water conditions
Description(s):Abstract: How much water can be taken up by roots and how this depends on the root and water distributions in the root zone are important questions that need to be answered to describe water fluxes in the soil–plant–atmosphere system. Physically based root water uptake (RWU) models that relate RWU to transpiration, root density, and water potential distributions have been developed but used or tested far less. This study aims at evaluating the simulated RWU of winter wheat using the empirical Feddes–Jarvis (FJ) model and the physically based Couvreur (C) model for different soil water conditions and soil textures compared to sap flow measurements. Soil water content (SWC), water potential, and root development were monitored noninvasively at six soil depths in two rhizotron facilities that were constructed in two soil textures: stony vs. silty, with each of three water treatments: sheltered, rainfed, and irrigated. Soil and root parameters of the two models were derived from inverse modeling and simulated RWU was compared with sap flow measurements for validation. The different soil types and water treatments resulted in different crop biomass, root densities, and root distributions with depth. The two models simulated the lowest RWU in the sheltered plot of the stony soil where RWU was also lower than the potential RWU. In the silty soil, simulated RWU was equal to the potential uptake for all treatments. The variation of simulated RWU among the different plots agreed well with measured sap flow but the C model predicted the ratios of the transpiration fluxes in the two soil types slightly better than the FJ model. The root hydraulic parameters of the C model could be constrained by the field data but not the water stress parameters of the FJ model. This was attributed to differences in root densities between the different soils and treatments which are accounted for by the C model, whereas the FJ model only considers normalized root densities. The impact of differences in root density on RWUcould be accounted for directly by the physically based RWUmodel but not by empirical models that use normalized root density functions.
Citation Advice:G.C. Cai, J. Vanderborght, M. Langensiepen, A. Schnepf, H. Huging and H. Vereecken. Root growth, water uptake, and sap flow of winter wheat in response to different soil water conditions. Hydrology and Earth System Sciences, 22,(4), 2449-2470, (2018).
Responsible Party
Creator(s):Author: Gaochao Cai
Author: Jan Vanderborght
Author: Matthias Langensiepen
Author: Andrea Schnepf
Author: Harry Vereecken
Publisher:Copernicus Publications, Göttingen, Germany
Topic
TR32 Topic:Soil
Related Sub-project(s):B4
Subject(s):CRC/TR32 Keywords: Root, Sap Flow, Winter Wheat, RWU, Soil Texture
Topic Category:Environment
File Details
File Name:Cai2018.pdf
Data Type:Text
File Size:59 kB (0.058 MB)
Date(s):Available: 2018-06-18
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Ellebach
Measurement Location:Selhausen
Specific Informations - Publication
Status:Accepted
Review:PeerReview
Year:2018
Type:Article
Source:Hydrology and Earth System Sciences
Page Range:2449 - 2470
Metadata Details
Metadata Creator:Mirjam Zörner
Metadata Created:2018-06-18
Metadata Last Updated:2018-06-19
Subproject:B4
Funding Phase:3
Metadata Language:English
Metadata Version:V42
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