in a mature temperate forest under elevated CO 2 Susan Quick SEQ616studentbhamacuk Giulio Curioni Phillip Blaen St e fan Krause A Rob MacKenzie https ID: 932007
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Slide1
Tree-Soil-Water relations in a mature temperate forest under elevated CO2 Susan Quick SEQ616@student.bham.ac.uk , Giulio Curioni, Phillip Blaen, Stefan Krause, A. Rob. MacKenzie
https://www.birmingham.ac.uk/research/bifor/face/index.aspx
Acknowledgements: BIFoR Operations Team and colleagues.
BIFoR
Free-Air Carbon-dioxide Enrichment (FACE)3 ambient air undisturbed ‘ghost arrays’3 ambient air control FACE rings 3 elevated treatments of +150 ppmv CO2
Project
Xylem
sapflux
Xylem Results 1
Xylem Results 2
Soil Water
SUMMARY
Transpiration
Slide2Project ObjectivesSoil moisture & temperaturePhoto K M Hart
Leaf temperature & transpiration
Sap flow & canopy transpiration
Summer
WinterFindings inform climate change models and help predict future forest resilience.To investigate: Water / water vapour cycling through Soil-Plant-Atmosphere continuum Key MeasurementsHow does elevated
CO
2
influence plant water usage and transpiration
?
Slide3Diurnal & seasonal dataDATA VISUALISATIONPoint Sapflux density mm s-12017- 2019 baseline analysis .Quick et al. (in prep) PLANT-WATER
XYLEM SAPFLOW Quercus robur trees
2 trees in each experimental patch
Confounding factors
tree sizesap speedwood characteristicsxylem widthwounding
Slide4Baseline future forest: 12 Quercus robur treesDiurnal sapflux (litres s-1)2018-19Infrastructure ArraysSunny Summer’s Day responses at BIFoR FACE
20182019
Q:
How does elevated
CO2 influence plant water usage and transpiration?
Result 1:
Diurnal
water usage
patterns not yet influenced by elevated CO
2
f
or
Baseline
2018-2019.
2020- 2021
Further 2020-2021 data analysis to
determine
influence of elevated CO
2
t
reatment
eCO
2
ambCO
2
trees
Quick et al. (in prep)
Slide5Step 2 Paired comparison: 4 Quercus robur treesDiurnal sapflux 2017-19Infrastructure Arrays A1:A3Sunny Summer’s Day responses at BIFoR FACE20172018
2019
Slide6Step 1 Baseline: 6 Quercus robur treesDiurnal sapflux 2017-19Undisturbed ArraysSunny Summer’s Day responses at BIFoR FACE20172018
2019
Quick et al. (in prep)
Result 2:
Diurnal water usage Baseline patterns for Undisturbed arrays 2017-2019.
Slide7tely measure soil moisture (to 100cm depth), soil temperature (surface to 60cm depth) across the 9 research patches and sap-flow for 18 oaks and 3 sycamores20172018drought
SOIL-WATER
SOIL MOISTURE (to 100cm depth) measuredWATER INPUT (precipitation) across the forest strongly influences shallow pore water availability.
Ghosts patches
wetterCO2 arrays, some reduction relative to pre-treatment Overall very heterogeneous
FULL ANALYSIS IN PROGRESS
RESULTS 3
Shallow
(12cm depth)
Volumetric
water content of
soil takes time to recover from dry years.
.
Quick et al. (in prep
)
tely measure soil moisture (to 100cm depth), soil temperature (surface to 60cm depth) across the 9 research patches and sap-flow for 18 oaks and 3 sycamores
2017
2018
drought
SOIL-WATER
SOIL MOISTURE
(10cm to
100cm depth) measured
WATER INPUT (precipitation) across the forest strongly influences shallow pore water availability.
Overall very heterogeneous
eCO
2
arrays,
recovered from 2018 drought
2019
Ghosts patches
wetter
Slide8TRANSPIRATIONSTOMATAL CONDUCTANCE :Rubus fruticosus/ bramble and Quercus robur oaks (2019) - 6 undisturbed trees 4 amb
CO2 trees 4 elevated CO2 trees
)Bramble
Oak top canopy
RESULTS 4Quick et al. (in prep)
Quercus
robur
/
Oak
leaves have more varied leaf temperature effects than
Bramble
FULL ANALYSIS IN PROGRESS
2019
Slide9BIFoR (FACE)2015-16 baseline pre-treatment 2017-2026 eCO2 @BIFoRUoB MacKenzie AR, et al., BIFoR FACE: Water-soil-vegetation-atmosphere research in a temperate deciduous forest catchment, including under elevated CO2, Hydrological Processes, submitted Sept. 2020Hart, et al. (2019
) Characteristics of Free Air Carbon Dioxide Enrichment of a Northern Temperate Mature Forest. Glob Change Biol. doi:10.1111/gcb.14786
Tree-soil-water relations 2017-2019https://www.birmingham.ac.uk/research/bifor/face/index.aspx
SUMMARY
Early sapflux analysis indicates there may be less tree water usage under elevated CO2 treatment but diurnal water usage differences not yet normalized Result 1 & 2 Volumetric water content within O horizon of soil responds to dry years consistently across treatments Result 3 Stomatal conductance/ leaf temperature measurement in process of analysis for 2019 onwards. Result 4Three years of Tree-soil-water data now available, two more year progressing for this study to 2021
– all open access by c2023
.
Thank You for viewing
Quick et al. (in prep)