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dc.contributor.author
Krause, Kim
dc.contributor.author
Cherubini, Paolo
dc.contributor.author
Bugmann, Harald
dc.contributor.author
Schleppi, Patrick
dc.date.accessioned
2020-10-16T06:50:59Z
dc.date.available
2017-06-10T12:51:09Z
dc.date.available
2020-10-16T06:50:59Z
dc.date.issued
2012-12
dc.identifier.issn
0829-318X
dc.identifier.issn
1758-4469
dc.identifier.other
10.1093/treephys/tps109
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/61944
dc.description.abstract
Human activities have drastically increased nitrogen (N) inputs into natural and near-natural terrestrial ecosystems such that critical loads are now being exceeded in many regions of the world. This implies that these ecosystems are shifting from natural N limitation to eutrophication or even N saturation. This process is expected to modify the growth of forests and thus, along with management, to affect their carbon (C) sequestration. However, knowledge of the physiological mechanisms underlying tree response to N inputs, especially in the long term, is still lacking. In this study, we used tree-ring patterns and a dual stable isotope approach (δ13C and δ18O) to investigate tree growth responses and the underlying physiological reactions in a long-term, low-dose N addition experiment (+23 kg N ha−1 a−1). This experiment has been conducted for 14 years in a mountain Picea abies (L.) Karst. forest in Alptal, Switzerland, using a paired-catchment design. Tree stem C sequestration increased by ∼22%, with an N use efficiency (NUE) of ca. 8 kg additional C in tree stems per kg of N added. Neither earlywood nor latewood δ13C values changed significantly compared with the control, indicating that the intrinsic water use efficiency (WUEi) (A/gs) did not change due to N addition. Further, the isotopic signal of δ18O in early- and latewood showed no significant response to the treatment, indicating that neither stomatal conductance nor leaf-level photosynthesis changed significantly. Foliar analyses showed that needle N concentration significantly increased in the fourth to seventh treatment year, accompanied by increased dry mass and area per needle, and by increased tree height growth. Later, N concentration and height growth returned to nearly background values, while dry mass and area per needle remained high. Our results support the hypothesis that enhanced stem growth caused by N addition is mainly due to an increased leaf area index (LAI). Higher LAI implies that more photosynthetically active radiation is absorbed and therefore canopy-level photosynthesis is increased. We conclude that models assuming that N deposition increases tree growth through higher leaf-level photosynthesis may be mechanistically inaccurate, at least in forest canopies that are not (yet) completely closed.
en_US
dc.language.iso
en
en_US
dc.publisher
Oxford University Press
en_US
dc.subject
Basal area increment
en_US
dc.subject
Carbon isotope
en_US
dc.subject
Leaf area dynamics
en_US
dc.subject
Long-term nitrogen addition
en_US
dc.subject
Nitrogen deposition
en_US
dc.subject
Norway spruce
en_US
dc.subject
Oxygen isotope
en_US
dc.subject
Tree rings
en_US
dc.title
Growth enhancement of Picea abies trees under long-term, low-dose N addition is due to morphological more than to physiological changes
en_US
dc.type
Journal Article
dc.date.published
2012-11-07
ethz.journal.title
Tree Physiology
ethz.journal.volume
32
en_US
ethz.journal.issue
12
en_US
ethz.pages.start
1471
en_US
ethz.pages.end
1481
en_US
ethz.identifier.wos
ethz.identifier.nebis
000035127
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::03535 - Bugmann, Harald / Bugmann, Harald
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::03535 - Bugmann, Harald / Bugmann, Harald
ethz.date.deposited
2017-06-10T12:53:14Z
ethz.source
ECIT
ethz.identifier.importid
imp5936503d0ef8793713
ethz.ecitpid
pub:98569
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2017-07-19T10:24:07Z
ethz.rosetta.lastUpdated
2021-02-15T18:24:40Z
ethz.rosetta.versionExported
true
ethz.COinS
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