High alternative oxidase activity in cold soils and its implication to the Dole Effect
Variations in the Dole Effect, which have been used to infer past changes in biospheric productivity, are strongly affected by isotopic discrimination in soil respiration. Respiration through the alternative oxidase (AOX) pathway is associated with a higher discrimination than the one associated wit...
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Online Access: | http://hdl.handle.net/10449/21534 https://doi.org/10.1029/2012GL052719 |
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ftiasma:oai:openpub.fmach.it:10449/21534 2024-02-11T10:09:14+01:00 High alternative oxidase activity in cold soils and its implication to the Dole Effect Angert, A. Griffin K. L. Rodeghiero, Mirco Angert, A. Rodeghiero, M. Griffin, K.L. 2012 http://hdl.handle.net/10449/21534 https://doi.org/10.1029/2012GL052719 eng eng American Geophysical Union info:eu-repo/semantics/altIdentifier/wos/WOS:000308309200005 volume:39 firstpage:L16710 journal:GEOPHYSICAL RESEARCH LETTERS http://hdl.handle.net/10449/21534 doi:10.1029/2012GL052719 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84865715275 info:eu-repo/semantics/closedAccess Oxygen isotope discrimination Oxygen diffusion Alaskan tundra Boreal forest Alpine forest O2 stable isotopes Settore BIO/07 - ECOLOGIA info:eu-repo/semantics/article 2012 ftiasma https://doi.org/10.1029/2012GL052719 2024-01-23T23:24:00Z Variations in the Dole Effect, which have been used to infer past changes in biospheric productivity, are strongly affected by isotopic discrimination in soil respiration. Respiration through the alternative oxidase (AOX) pathway is associated with a higher discrimination than the one associated with the "normal" dark respiration pathway (the cytochrome pathway, COX). However, observations of O2 discrimination and AOX activity in undisturbed natural environments are scarce. In the current study we measured the O2 concentration and stable isotopes in the root zone of tundra, boreal forest and alpine forest soils. To estimate the discrimination from this data, we have performed O2 diffusion experiments in gamma-sterilized soil columns, with varying soil clay content. The discrimination found in the diffusion experiments was independent of clay content, and the value found, 14{plus minus}2‰, is the same as the one for binary diffusion of O2 in N2, indicating no interaction between the O2 and clay particles. Based on the field and laboratory results, the respiratory discrimination in the soils studied is 15-31‰, with the higher values associated with colder soils. The high discrimination found for cold (<6{degree sign}C) soils indicates that AOX is a major respiratory pathway in these soils. This relationship between soil temperature and discrimination can be used in future interpretations of Dole Effect variations. Article in Journal/Newspaper Tundra Fondazione Edmund Mach: IRIS-OpenPub Geophysical Research Letters 39 16 n/a n/a |
institution |
Open Polar |
collection |
Fondazione Edmund Mach: IRIS-OpenPub |
op_collection_id |
ftiasma |
language |
English |
topic |
Oxygen isotope discrimination Oxygen diffusion Alaskan tundra Boreal forest Alpine forest O2 stable isotopes Settore BIO/07 - ECOLOGIA |
spellingShingle |
Oxygen isotope discrimination Oxygen diffusion Alaskan tundra Boreal forest Alpine forest O2 stable isotopes Settore BIO/07 - ECOLOGIA Angert, A. Griffin K. L. Rodeghiero, Mirco High alternative oxidase activity in cold soils and its implication to the Dole Effect |
topic_facet |
Oxygen isotope discrimination Oxygen diffusion Alaskan tundra Boreal forest Alpine forest O2 stable isotopes Settore BIO/07 - ECOLOGIA |
description |
Variations in the Dole Effect, which have been used to infer past changes in biospheric productivity, are strongly affected by isotopic discrimination in soil respiration. Respiration through the alternative oxidase (AOX) pathway is associated with a higher discrimination than the one associated with the "normal" dark respiration pathway (the cytochrome pathway, COX). However, observations of O2 discrimination and AOX activity in undisturbed natural environments are scarce. In the current study we measured the O2 concentration and stable isotopes in the root zone of tundra, boreal forest and alpine forest soils. To estimate the discrimination from this data, we have performed O2 diffusion experiments in gamma-sterilized soil columns, with varying soil clay content. The discrimination found in the diffusion experiments was independent of clay content, and the value found, 14{plus minus}2‰, is the same as the one for binary diffusion of O2 in N2, indicating no interaction between the O2 and clay particles. Based on the field and laboratory results, the respiratory discrimination in the soils studied is 15-31‰, with the higher values associated with colder soils. The high discrimination found for cold (<6{degree sign}C) soils indicates that AOX is a major respiratory pathway in these soils. This relationship between soil temperature and discrimination can be used in future interpretations of Dole Effect variations. |
author2 |
Angert, A. Rodeghiero, M. Griffin, K.L. |
format |
Article in Journal/Newspaper |
author |
Angert, A. Griffin K. L. Rodeghiero, Mirco |
author_facet |
Angert, A. Griffin K. L. Rodeghiero, Mirco |
author_sort |
Angert, A. |
title |
High alternative oxidase activity in cold soils and its implication to the Dole Effect |
title_short |
High alternative oxidase activity in cold soils and its implication to the Dole Effect |
title_full |
High alternative oxidase activity in cold soils and its implication to the Dole Effect |
title_fullStr |
High alternative oxidase activity in cold soils and its implication to the Dole Effect |
title_full_unstemmed |
High alternative oxidase activity in cold soils and its implication to the Dole Effect |
title_sort |
high alternative oxidase activity in cold soils and its implication to the dole effect |
publisher |
American Geophysical Union |
publishDate |
2012 |
url |
http://hdl.handle.net/10449/21534 https://doi.org/10.1029/2012GL052719 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000308309200005 volume:39 firstpage:L16710 journal:GEOPHYSICAL RESEARCH LETTERS http://hdl.handle.net/10449/21534 doi:10.1029/2012GL052719 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84865715275 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2012GL052719 |
container_title |
Geophysical Research Letters |
container_volume |
39 |
container_issue |
16 |
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n/a |
op_container_end_page |
n/a |
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1790609012619739136 |