Direct Penman-Monteith parameterization for estimating stomatal conductance and modeling sap flow

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F17%3A43912354" target="_blank" >RIV/62156489:43410/17:43912354 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s00468-016-1513-3" target="_blank" >http://dx.doi.org/10.1007/s00468-016-1513-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00468-016-1513-3" target="_blank" >10.1007/s00468-016-1513-3</a>

Result language

angličtina

Original language name

Direct Penman-Monteith parameterization for estimating stomatal conductance and modeling sap flow

Original language description

The Penman-Monteith equation of evaporation is often combined with sap flow measurements to describe canopy transpiration and stomatal conductance. The traditional approach involves a two-step calculation. In the first step, stomatal conductance is computed using an inverted form of Penman-Monteith equation. The second step correlates these values with environmental factors. In this work, we present an improved approach for direct parameterization of the Penman-Monteith equation developed to compute diurnal courses of stand canopy conductance (g (c)) from sap flow. The main advantages of this proposed approach versus using the classical approch are: (1) the calculation process is faster and involves fewer steps, (2) parameterization provides realistic values of canopy conductance, including conditions of low atmospheric vapor pressure deficit (D), whereas the traditional approach tends to yield unrealistic values for low D and (3) the new calculation method does not require enveloping curves to describe dependence of g(c) on D and thus avoids subjective data selection but it still allows to visualize separable responses of g(c) to environmental drivers (i.e., global radiation and vapor pressure deficit). The proposed approach was tested to calculate g(c) and to model the sap flow of a high mountain Pinus canariensis forest. The new calculation method permitted us to describe the stand canopy conductance and stand sap flow in sub-hour resolution for both day and night conditions. Direct parameterization of the Penman-Monteith approach as implemented in this study proved sufficiently sensitive for detecting diurnal variation in g(c) and for predicting sap flow from environmental variables under various atmospheric evapotranspirative demands and differing levels of soil water availability.

Czech name

—

Czech description

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Type

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

CEP classification

—

OECD FORD branch

40102 - Forestry

Project

<a href="/en/project/LD13017" target="_blank" >LD13017: Response of Scots pine physiology, xylem anatomy and wood formation to the 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

Trees - Structure and Function

ISSN

0931-1890

e-ISSN

—

Volume of the periodical

31

Issue of the periodical within the volume

3

Country of publishing house

DE - GERMANY

Number of pages

13

Pages from-to

873-885

UT code for WoS article

000401740600007

EID of the result in the Scopus database

2-s2.0-85006868245