Central European hardwood trees in a high-CO 2 future: synthesis of an 8-year forest canopy CO 2 enrichment project

Bader, Martin K.-F.; Leuzinger, Sebastian; Keel, Sonja Gisela Yin; Siegwolf, Rolf T.W.; Hagedorn, Frank; Schleppi, Patrick; Körner, Christian (2013). Central European hardwood trees in a high-CO 2 future: synthesis of an 8-year forest canopy CO 2 enrichment project. Journal of Ecology, 101(6), pp. 1509-1519. Blackwell 10.1111/1365-2745.12149

[img] Text
jec12149.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.
Copyright 2014 American Geophysical Union

Download (546kB) | Request a copy

Rapidly increasing atmospheric CO2 is not only changing the climate system but may also affect the biosphere directly through stimulation of plant growth and ecosystem carbon and nutrient cycling. Although forest ecosystems play a critical role in the global carbon cycle, experimental information on forest responses to rising CO2 is scarce, due to the sheer size of trees. Here, we present a synthesis of the only study world-wide where a diverse set of mature broadleaved trees growing in a natural forest has been exposed to future atmospheric CO2 levels (c. 550ppm) by free-air CO2 enrichment (FACE). We show that litter production, leaf traits and radial growth across the studied hardwood species remained unaffected by elevated CO2 over 8years. CO2 enrichment reduced tree water consumption resulting in detectable soil moisture savings. Soil air CO2 and dissolved inorganic carbon both increased suggesting enhanced below-ground activity. Carbon release to the rhizosphere and/or higher soil moisture primed nitrification and nitrate leaching under elevated CO2; however, the export of dissolved organic carbon remained unaltered.Synthesis. Our findings provide no evidence for carbon-limitation in five central European hardwood trees at current ambient CO2 concentrations. The results of this long-term study challenge the idea of a universal CO2 fertilization effect on forests, as commonly assumed in climate-carbon cycle models.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Keel, Sonja Gisela Yin

Subjects:

500 Science > 530 Physics

ISSN:

0022-0477

Publisher:

Blackwell

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

29 Sep 2014 14:12

Last Modified:

01 Sep 2015 08:17

Publisher DOI:

10.1111/1365-2745.12149

Web of Science ID:

000325984300014

BORIS DOI:

10.7892/boris.49623

URI:

https://boris.unibe.ch/id/eprint/49623

Actions (login required)

Edit item Edit item
Provide Feedback