Evidence of field-scale shifts in transpiration dynamics following bark beetle infestation: Stomatal conductance responses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10481166" target="_blank" >RIV/00216208:11310/24:10481166 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=BCbtv-gpDy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=BCbtv-gpDy</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/hyp.15162" target="_blank" >10.1002/hyp.15162</a>

Result language

angličtina

Original language name

Evidence of field-scale shifts in transpiration dynamics following bark beetle infestation: Stomatal conductance responses

Original language description

Amplified eruptive outbreaks of bark beetles as a consequence of climate change can cause tree mortality that significantly affects terrestrial water and carbon fluxes. However, the lack of field-scale observations of underlying physiological mechanisms currently hampers the expression of such ecosystem disturbances in predictive modelling. Based on a unique flux tower dataset from a subalpine forest located in the Rocky Mountains, mechanisms of stomatal response to an extensive bark beetle outbreak were investigated using various models and parametrizations. The datasets cover a decade, including the periods of pre-infestation, infestation, and post-infestation. Field measurements showed considerable decreases in evapotranspiration (ET), transpiration (T), and leaf area index (LAI) during the two-year infestation period compared to the pre-infestation period. Model interpretations of observed water and carbon fluxes indicated that the overall reductions in T were not solely due to decreased LAI, but also to changes in physiological behaviours. The summer season&apos;s canopy-scale stomatal conductance was significantly reduced during the infestation period, from 0.0018 to 0.0011 m s(-1). One primary reason for the observed variations is likely that the bark beetle infestation hampers the water transport in the xylem. The damage of xylem has important implications for water use efficiency (WUE), which also significantly influences the parameterization of stomatal conductance. When using stomatal conductance models to forecast ecosystem dynamics, it is crucial to recalibrate the model&apos;s parameters to ensure the accurate depiction of stomatal dynamics during various infestation periods. The neglect of the temporal variability of canopy-scale stomatal conductance under ecosystem disturbances (e.g., bark beetle infestations) in current earth system models, therefore, requires specific attention in assessments of large-scale water and carbon balances. By comparing the simulation accuracy of stomatal conductance and transpiration under an evolution-varied parameterization (considering all infestation stages) and a pre-infestation-fixed parameterization (considering undisturbed conditions) of three stomatal conductance models (Ball-Berry, Leuning, and Medlyn model), the impact of bark beetle infestation was identified. The findings highlight that the overall transpiration reduction was not only caused by reduced LAI, but also by changing physiological behaviour, which was neglected by all current models. image

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

10508 - Physical geography

Project

<a href="/en/project/GN22-20422O" target="_blank" >GN22-20422O: Insect induced tree mortality under climate change – Impacts on hydrology and geochemistry across scales</a><br>

Continuities

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

Publication year

2024

Confidentiality

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

Name of the periodical

Hydrological Processes

ISSN

0885-6087

e-ISSN

1099-1085

Volume of the periodical

38

Issue of the periodical within the volume

5

Country of publishing house

GB - UNITED KINGDOM

Number of pages

20

Pages from-to

e15162

UT code for WoS article

001226374400001

EID of the result in the Scopus database

2-s2.0-85193520230