Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth Tang, Jianwu Luyssaert, Sebastiaan Richardson, Andrew D. Kutsch, Werner Janssens, Ivan A. 2014-06-11T19:52:40Z 2014-12-02T10:01:28Z 2014-04
dc.description Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 111 (2014): 8856-8860, doi:10.1073/pnas.1320761111. en_US
dc.description.abstract The traditional view of forest dynamics originated by Kira, Shidei, and Odum suggests a decline in net primary productivity (NPP) in ageing forests due to stabilized gross primary productivity (GPP) and continuously increased autotrophic respiration (Ra). The validity of these trends in GPP and Ra is, however, very difficult to test because of the lack of long-term ecosystem-scale field observations of both GPP and Ra. Ryan and colleagues have proposed an alternative hypothesis drawn from site-specific results that aboveground respiration and belowground allocation decreased in ageing forests. Here we analyzed data from a recently assembled global database of carbon fluxes and show that the classical view of the mechanisms underlying the age-driven decline in forest NPP is incorrect and thus support Ryan’s alternative hypothesis. Our results substantiate the age-driven decline in NPP, but in contrast to the traditional view, both GPP and Ra decline in ageing boreal and temperate forests. We find that the decline in NPP in ageing forests is primarily driven by GPP, which decreases more rapidly with increasing age than Ra does, but the ratio of NPP/GPP remains approximately constant within a biome. Our analytical models describing forest succession suggest that dynamic forest ecosystem models that follow the traditional paradigm need to be revisited. en_US
dc.description.embargo 2014-12-02 en_US
dc.description.sponsorship We thank all site investigators, their funding agencies and the various regional flux networks (Afriflux, AmeriFlux, AsiaFlux, CarboAfrica, CarboEurope-IP, ChinaFlux, Fluxnet-Canada, KoFlux, LBA, NECC, OzFlux, TCOS-Siberia, and USCCC) and the Fluxnet project, whose support is essential for obtaining the measurement data without which this synthesis analysis would not be possible. The collection of the original global database was funded by the Research Foundation - Flanders (FWO-Vlaanderen) who supported S.L. with a post-doctoral fellowship and a research grant (FWO 1.5037.07N). J. Tang was partially supported by U.S. Department of Energy the Office of Biological and Environmental Research (DE-SC0006951), and National Science Foundation (DBI-959333 and AGS-1005663). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.subject Succession en_US
dc.subject Chronosequence en_US
dc.subject Forest dynamics en_US
dc.subject Photosynthesis en_US
dc.subject Respiration en_US
dc.subject Carbon flux en_US
dc.subject Carbon use efficiency en_US
dc.title Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth en_US
dc.type Preprint en_US
dspace.entity.type Publication
relation.isAuthorOfPublication a8fc2287-ebee-4e91-a959-2b340f864dbc
relation.isAuthorOfPublication 518c3b0e-86c2-48ca-a0dd-d5dfcf4e4f06
relation.isAuthorOfPublication 2ee975ba-8b90-479d-81ed-3116db98a70f
relation.isAuthorOfPublication 4e264662-8400-4111-95a2-71da502266f7
relation.isAuthorOfPublication 53c8900f-66cf-458a-8437-93c1e6c9f149
relation.isAuthorOfPublication.latestForDiscovery a8fc2287-ebee-4e91-a959-2b340f864dbc
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
980.28 KB
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
1.89 KB
Item-specific license agreed upon to submission