A Simple Representation of Plant Water Storage Effects in Coupled Soil Water Flow and Transpiration Stream Modeling

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00312050" target="_blank" >RIV/68407700:21110/17:00312050 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.2136/vzj2016.12.0128" target="_blank" >http://dx.doi.org/10.2136/vzj2016.12.0128</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2136/vzj2016.12.0128" target="_blank" >10.2136/vzj2016.12.0128</a>

Result language

angličtina

Original language name

A Simple Representation of Plant Water Storage Effects in Coupled Soil Water Flow and Transpiration Stream Modeling

Original language description

When describing the movement of water in a variably saturated plant root zone, most existing hydrological models use the assumption of quasi-steady-state flow to relate root water uptake to canopy transpiration, thereby neglecting the effect of changing plant water storage. This approach is known to be problematic, especially when considering relatively large volumes of water stored in the tissues of tall trees. We propose a simple algorithm, based on the concept of whole-plant hydraulic capacitance, to deal with the problem. The algorithm is implemented in a one-dimensional soil water flow model involving vertically distributed macroscopic root water uptake. In this study, the proposed transient storage approach was compared with the quasi-steady-state approach. Both approaches were used to simulate soil water flow and diurnal variations of transpiration at a forest site covered with Norway spruce [Picea abies (L.) H. Karst.]. The key parameter of the transient storage approach, the plant hydraulic capacitance, is estimated by comparing the variations in the potential transpiration rate, derived from micrometeorological measurements, with observed sap flow intensities. The application of the proposed algorithm leads to more realistic predictions of root water uptake rates at the site of interest. The inclusion of the plant water storage effects improved the ability of the model to capture the anticipated diurnal variations in actual transpiration rates. The algorithm can be easily implemented into existing soil water flow models and used to simulate transpiration stream responses to varying atmospheric and soil moisture conditions including isohydric and partly also anisohydric plant responses to drought stress.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10501 - Hydrology

Project

<a href="/en/project/GA16-05665S" target="_blank" >GA16-05665S: Soil water regime in headwater catchments under climatic stress</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Vadose Zone Journal

ISSN

1539-1663

e-ISSN

—

Volume of the periodical

16

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

—

UT code for WoS article

000402314000006

EID of the result in the Scopus database

2-s2.0-85019220385