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dc.contributor.author
Petrillo, Marta
dc.contributor.author
Cherubini, Paolo
dc.contributor.author
Fravolini, Giulia
dc.contributor.author
Marchetti, Marco
dc.contributor.author
Ascher-Jenull, Judith
dc.contributor.author
Schärer, Michael
dc.contributor.author
Synal, Hans-Arno
dc.contributor.author
Bertoldi, Daniela
dc.contributor.author
Camin, Federica
dc.contributor.author
Larcher, Roberto
dc.contributor.author
Egli, Markus
dc.date.accessioned
2018-10-01T16:25:26Z
dc.date.available
2017-06-12T03:10:36Z
dc.date.available
2018-10-01T16:25:26Z
dc.date.issued
2016
dc.identifier.other
10.5194/bg-13-1537-2016
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/114501
dc.identifier.doi
10.3929/ethz-b-000114501
dc.description.abstract
Due to the large size (e.g. sections of tree trunks) and highly heterogeneous spatial distribution of deadwood, the timescales involved in the coarse woody debris (CWD) decay of Picea abies (L.) Karst. and Larix decidua Mill. in Alpine forests are largely unknown. We investigated the CWD decay dynamics in an Alpine valley in Italy using the chronosequence approach and the five-decay class system that is based on a macromorphological assessment. For the decay classes 1–3, most of the dendrochronological samples were cross-dated to assess the time that had elapsed since tree death, but for decay classes 4 and 5 (poorly preserved tree rings) radiocarbon dating was used. In addition, density, cellulose, and lignin data were measured for the dated CWD. The decay rate constants for spruce and larch were estimated on the basis of the density loss using a single negative exponential model, a regression approach, and the stage-based matrix model. In the decay classes 1–3, the ages of the CWD were similar and varied between 1 and 54 years for spruce and 3 and 40 years for larch, with no significant differences between the classes; classes 1–3 are therefore not indicative of deadwood age. This seems to be due to a time lag between the death of a standing tree and its contact with the soil. We found distinct tree-species-specific differences in decay classes 4 and 5, with larch CWD reaching an average age of 210 years in class 5 and spruce only 77 years. The mean CWD rate constants were estimated to be in the range 0.018 to 0.022y−1 for spruce and to about 0.012y−1 for larch. Snapshot sampling (chronosequences) may overestimate the age and mean residence time of CWD. No sampling bias was, however, detectable using the stage-based matrix model. Cellulose and lignin time trends could be derived on the basis of the ages of the CWD. The half-lives for cellulose were 21 years for spruce and 50 years for larch. The half-life of lignin is considerably higher and may be more than 100 years in larch CWD. Consequently, the decay of Picea abies and Larix decidua is very low. Several uncertainties, however, remain: 14C dating of CWD from decay classes 4 and 5 and having a pre-bomb age is often difficult (large age range due to methodological constraints) and fall rates of both European larch and Norway spruce are missing.
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Time since death and decay rate constants of Norway spruce and European larch deadwood in subalpine forests determined using dendrochronology and radiocarbon dating
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2016-03-11
ethz.journal.title
Biogeosciences
ethz.journal.volume
13
en_US
ethz.journal.issue
5
en_US
ethz.pages.start
1537
en_US
ethz.pages.end
1552
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.notes
.
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
006289717
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::08619 - Labor für Ionenstrahlphysik (LIP)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::08619 - Labor für Ionenstrahlphysik (LIP)
ethz.date.deposited
2017-06-12T03:12:54Z
ethz.source
ECIT
ethz.identifier.importid
imp5936543ff330977995
ethz.ecitpid
pub:176290
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-18T09:01:06Z
ethz.rosetta.lastUpdated
2019-01-02T14:19:28Z
ethz.rosetta.versionExported
true
ethz.COinS
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