Obermeier, W.; Lehnert, L.; Kammann, C.; Müller, C.; Grünhage, L.; Luterbacher, J.; Erbs, M.; Moser, G.; Seibert, R.; Yuan, N. & Bendix, J. (2016-09-26). <b>Extreme weather conditions reduce the CO2 fertilization in temperate C3 grasslands</b>. Presented at FACEing the future, Giessen.
Resource Description
Title:
Extreme weather conditions reduce the CO2 fertilization in temperate C3 grasslands
FOR816dw ID:
284
Publication Date:
2016-09-26
License and Usage Rights:
Resource Owner(s):
Individual:
Wolfgang Obermeier
Contact:
email:
wolfgang.obermeier <at> geo.uni-marburg.de
Germany
Individual:
Lukas Lehnert
Contact:
email:
lukas.lehnert <at> staff.uni-marburg.de
Germany
Individual:
Claudia Kammann
Contact:
email:
webmaster <at> lcrs.de
Individual:
Christoph Müller
Contact:
email:
webmaster <at> lcrs.de
Individual:
Ludger Grünhage
Contact:
email:
webmaster <at> lcrs.de
Individual:
Jürg Luterbacher
Contact:
email:
webmaster <at> lcrs.de
Individual:
Martin Erbs
Contact:
email:
webmaster <at> lcrs.de
Individual:
Gerald Moser
Contact:
email:
webmaster <at> lcrs.de
Individual:
Ruben Seibert
Contact:
email:
webmaster <at> lcrs.de
Individual:
Naiming Yuan
Contact:
email:
webmaster <at> lcrs.de
Individual:
Jörg Bendix
Contact:
email:
bendix <at> staff.uni-marburg.de
Deutschhausstraße 12
Room No. 02 A 48
35032 Marburg
Faculty of Geography
Germany
Abstract:
The increase of atmospheric greenhouse gas concentrations resulting from anthropogenic activities is the major driver of global climate change. A net sink effect caused by stimulated plant photosynthesis through rising atmospheric carbon dioxide concentrations ([CO2]) and, consequently, an increased net primary productivity (NPP) of C3 plants (termed the CO2 fertilization effect, CFE) is widely assumed. However, knowledge about the magnitude and persistence of the CFE under future climates including more frequent weather extremes is still lacking. Therefore, we have investigated the CFE in dependence to its accompanying environmental conditions in the long-term time series (16 years) of a temperate grassland grown under “Free Air Carbon dioxide Enrichment” in Gießen, the GiFACE. Our results reveal that the CFE is strongest under local average environmental conditions and reduced or disappeared under wetter, drier and/or hotter conditions. This is in contrast to predictions of an increased CO2 fertilization under drier and warmer conditions. The results are of utmost importance because respective weather and climate conditions are projected in climate scenarios. Consequently, the state-of-art biogeochemical models might overestimate the future NPP sink capacity of temperate C3 grasslands. Since temperate grasslands represent an important portion of the Earth’s terrestrial surface, and therefore the global carbon cycle, atmospheric [CO2] might increase faster than currently expected.
Keywords:
| climate change | CO2 fertilization | global change experiment | Free Air CO2 Enrichment ( FACE ) | Grassland ecology |
