HAL Id: hal-02816546
https://hal.inrae.fr/hal-02816546
Submitted on 6 Jun 2020
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Preliminary study of climate change combined with a summer extreme event on permanent grassland.
Angela Augusti, Catherine Picon-Cochard, Jean-François Soussana, J Roy
To cite this version:
Angela Augusti, Catherine Picon-Cochard, Jean-François Soussana, J Roy. Preliminary study of climate change combined with a summer extreme event on permanent grassland.. Colloque Ecologie, Sep 2010, Montpellier, France. 2010. �hal-02816546�
Preliminary study of climate change combined with a summer extreme event on permanent grassland
Augusti A, Roy J, Soussana J-F and Picon-Cochard C
In the context of future climate change our study aims to reveal
possible compensation of increasing CO
2concentration on drought and heat wave effects mainly on:
root system
botanical composition
This has as goal to:
Improve pasture models such as PaSim
Clarify the role of temperate grassland ecosystems as sink for future
increases of CO
2concentration
Evaluate vulnerability of grassland ecosystems to future climate change
Poster session 1: Climate Change Impacts
http://www.clermont.inra.fr/urep/accae/
Future climate treatment
The chosen scenario, 2040-2060 corresponds to:
a CO2concentration of 500 ppm
an increase in mean annual temperatureof 2.3°C a decrease in annual precipitationof 11%
Plant material
Grassland monolithsare coming from an upland site in central France
The experiment is performed at the European Ecotronof Montpellier
Julian days
Cumulation of rainfall, mm
-10 10 30 50 70 90 110
2040-2060 with drought
182 192 202 212 222 232 242 252 262 272
1-15 August 0 mm rain 2040-2060
Julian days 1-15 August
+3.5 °C 5
10 15 20 25 30 35
182 192 202 212 222 232 242 252 262 272 2040-2060 with heat wave 2040-2060
Meantemperature, °C
Julian days 1-15 August
+ 3.5 °C
Summer extreme event treatments
Heat wave Drought
Experimental set up
Atmospheric CO2
Photosynthesis Respiration
Soil Respiration Air Humidity
Precipitation
Evapo transpiration
Soil Evaporation
Pilot experiment
Since April 2010 monoliths were exposed to climate conditions of the scenario 2040-2060, but no extreme events were applied
Above-ground biomass and root growth have been followed during this summer Next year, extreme treatment effects will be studied
Ecosystem processes evaluated
Carbon and water fluxes
Above-ground biomass production
Botanical composition Root growth
Soil and root respiration Root decomposition
Root chemical composition
