Mesoscopic aspects of root water uptake modeling – hydraulic resistances and root geometry interpretations in plant transpiration analysis
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00235391" target="_blank" >RIV/68407700:21110/16:00235391 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.advwatres.2015.12.006" target="_blank" >http://dx.doi.org/10.1016/j.advwatres.2015.12.006</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.advwatres.2015.12.006" target="_blank" >10.1016/j.advwatres.2015.12.006</a>
Alternative languages
Result language
angličtina
Original language name
Mesoscopic aspects of root water uptake modeling – hydraulic resistances and root geometry interpretations in plant transpiration analysis
Original language description
In the context of soil water flow modeling, root water uptake is often evaluated based on water potential difference between the soil and the plant (the water potential gradient approach). Root water uptake rate is modulated by hydraulic resistance of both the root itself, and the soil in the root vicinity. The soil hydraulic resistance is a function of actual soil water content and can be assessed assuming radial axisymmetric water flow toward a single root (at the mesoscopic scale). In the present study, three approximate solutions of mesoscopic root water uptake - finite difference approximation, steady-state solution, and steady-rate solution - are examined regarding their ability to capture the pressure head variations in the root vicinity. Insignificance of their differences when implemented in the macroscopic soil water flow model is demonstrated using the critical root water uptake concept. Subsequently, macroscopic simulations of coupled soil water flow and root water uptake are presented for a forest site under temperate humid climate. Predicted soil water pressure heads and actual transpiration rates are compared with observed data. Scenario simulations illustrate uncertainties associated with estimates of root geometrical and hydraulic properties. Regarding the actual transpiration prediction, the correct characterization of active root system geometry and hydraulic properties seems far more important than the choice of a particular mesoscopic model.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DA - Hydrology and limnology
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GC14-15201J" target="_blank" >GC14-15201J: Subsurface transport of water, carbon and heat - combined hydrological, geochemical and isotopic approach</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Advances in Water Resources
ISSN
0309-1708
e-ISSN
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Volume of the periodical
88
Issue of the periodical within the volume
February
Country of publishing house
GB - UNITED KINGDOM
Number of pages
11
Pages from-to
86-96
UT code for WoS article
000371311800010
EID of the result in the Scopus database
2-s2.0-84952815027